US20100088981A1 - Structural Insulated Panel for a Foundation Wall and Foundation Wall Incorporating Same - Google Patents
Structural Insulated Panel for a Foundation Wall and Foundation Wall Incorporating Same Download PDFInfo
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- US20100088981A1 US20100088981A1 US12/248,552 US24855208A US2010088981A1 US 20100088981 A1 US20100088981 A1 US 20100088981A1 US 24855208 A US24855208 A US 24855208A US 2010088981 A1 US2010088981 A1 US 2010088981A1
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- Prior art keywords
- insulation
- foundation wall
- panel
- sheets
- sips
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/10—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products
- E04C2/24—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products laminated and composed of materials covered by two or more of groups E04C2/12, E04C2/16, E04C2/20
- E04C2/243—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products laminated and composed of materials covered by two or more of groups E04C2/12, E04C2/16, E04C2/20 one at least of the material being insulating
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/0007—Base structures; Cellars
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/10—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products
- E04C2/24—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products laminated and composed of materials covered by two or more of groups E04C2/12, E04C2/16, E04C2/20
- E04C2/246—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products laminated and composed of materials covered by two or more of groups E04C2/12, E04C2/16, E04C2/20 combinations of materials fully covered by E04C2/16 and E04C2/20
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
- E04C2/34—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts
Definitions
- the present invention relates generally to building structures and particularly to a structural insulated panel for a foundation wall and to a foundation wall incorporating the same.
- Structural insulated panels are an increasingly common material used in the construction of residential homes and other structures.
- Conventional SIPs have a sandwich-type structure, and comprise two sheets typically of a wood-based material, such as plywood or oriented strand board (“OSB”), that are bonded to an inner slab or foam insulation.
- Expanded polystyrene (“EPS”) is typically used for the insulation, with extruded polystyrene and polyurethane foam sometimes being used.
- the bonded sandwich structure of SIPs has been demonstrated to provide comparable strength to conventional walls consisting of a lumber stud frame filled with slabs of fiberglass insulation.
- SIPs are typically fabricated as sheets of a standard size (e.g. 4 feet ⁇ 8 feet), which can then be cut to size on-site as needed prior to installation.
- a key advantage of SIPs over conventional fiberglass/lumber stud walls is the superior thermal insulating performance offered by the closed cell structure of expanded polystyrene, which consists of a network of closed pockets of air trapped in the polystyrene.
- This closed cell structure results in the foam insulation being both airtight, which is beneficial for thermal insulation, and impermeable to moisture, which prevents the occurrence of water-related damage such as rotting and mould growth that could otherwise occur in “open cell” insulation materials such as fiberglass.
- U.S. Pat. No. 6,279,287 to Meadows discloses a prefabricated building panel that includes first and second side panel members.
- a thermally insulating core is disposed between the panel members.
- a first panel end surface includes a pair of spaced projections defining a channel-way, while a second panel end surface includes a pair of spaced channels separated by a plug.
- Two adjacent building panels may be interconnected by engaging the pair of projections at the first end with the pair of channels and plug at the second end.
- U.S. Pat. No. 6,599,621 to Porter discloses a flat structural panel for building construction that includes an inner insulating core of plastic foam and a pair of opposed outer facings, or sheets, bonded to the insulated core.
- One of the outer facings is of gypsum composite, or gypsum fiberboard, while the other outer facing is of a special plastic-impregnated OSB.
- the gypsum and OSB facings form the inner and outer surfaces of the panel.
- the facings provide high tensile strength, with the gypsum composite or fiberboard facing also providing resistance to fire and insects.
- U.S. Patent Application Publication No. 20060117689 to Onken et al. discloses an insulated structural panel formed with a rigid foam core, a plurality of vertical hat channels on either face of the rigid foam core, and horizontal top and bottom L-channels on either face of the rigid foam core.
- the plurality of vertical hat channels on opposing faces of the rigid foam core is connected so as to compress the rigid foam core, thus adding structural strength to the insulated structural panel.
- a portion of the wall is below grade (i.e. below the ground surface), and the base of the foundation wall is typically placed upon a footing, which can either comprise a solid surface, such as a concrete pad, or a hard particulate bed, such as compacted gravel.
- a foundation wall comprising: a plurality of abutting, generally upright structural insulated panels, each of the panels comprising a slab of insulation sandwiched between first and second sheets and a top plate adjacent the top of said panel aid overlaying said insulation, the lower end of said panel being devoid of a bottom plate.
- a structural insulated panel comprising: a first sheet; a second sheet; and insulation sandwiched between and bonded to the first and second sheets, wherein the first and second sheets and insulation are configured to define a generally planar, bottom surface of said panel.
- a structural insulated panel comprising: a first and second sheet each bonded to a respective first and second side of a slab of insulation, the sheets and insulation being configured to define generally planar, side surfaces of said panel.
- FIG. 1 is a cross-sectional side view of a foundation wall comprising a plurality of abutting structural insulated panels (“SIPs”);
- FIGS. 2 a and 2 b are cross-sectional side views of a base of the foundation wall of FIG. 1 supported by concrete and compacted gravel footings, respectively;
- FIGS. 3 a and 3 b are cross-sectional top views showing a lumber spline joint and a SIP spline joint, respectively, formed between two adjacent SIPs in the foundation wall of FIG. 1 ;
- FIGS. 4 a, 4 b, and 4 c are isometric, cross-sectional top, and isometric views, respectively, showing a corner configuration formed between two adjacent SIPs in the foundation wall of FIG. 1 ;
- FIG. 5 is an isometric view of a SIP in the foundation wall of FIG. 1 having a window opening therein;
- FIGS. 6 a and 6 b are cross-sectional top views showing a lap joint formed between two adjacent SIPs in a foundation wall;
- FIGS. 7 a and 7 b are cross-sectional side views of a frost wall comprising abutting SIPs supported by concrete and compacted gravel footings, respectively;
- FIG. 8 is a cross-sectional top view showing a butt joint formed between two adjacent SIPs in the frost wall of FIGS. 7 a and 7 b;
- FIGS. 9 a to 9 f are cross-sectional views showing temporary lateral supports used with the butt joint of FIG. 8 ;
- FIG. 10 is a cross-sectional top view showing a corner configuration formed between two adjacent SIPs in the front wall of FIGS. 7 a and 7 b.
- foundation wall 18 comprises a plurality of abutting, generally upright structural insulated panels (“SIPs”) 20 that define vertical walls in the foundation of a residential structure, such as a house, and that separate an interior 22 of a living space in a lower level or basement of the residential structure from an exterior 24 of the residential structure.
- SIPs 20 provide support for loads imposed by the residential structure above SIPs 20 .
- SIPs 20 provide support for a floor joist system 26 and upper outer walls 28 .
- the lower ends of SIPs 20 are supported by footing 30 , which is typically a concrete pad, as shown in FIG. 2 a.
- SIPs 20 and footing 30 are arranged in an abutting relationship with screed boards 31 and concrete slab 32 , the latter of which serves as a floor of interior 22 .
- Each SIP 20 has a generally sandwich-type structure that provides high strength both axially (i.e. along the vertical and horizontal axes) and in bending.
- each SIP 20 comprises an interior sheet 34 , which faces interior 22 of the residential structure and an exterior sheet 36 , which faces exterior 24 .
- the materials used for interior sheet 34 and exterior sheet 36 are selected according to local building and construction codes for preserved wood foundations (e.g. CAN/CSA S406-M92, “Construction of Preserved Wood foundations”, a standard required by the 1995 National Building Code of Canada).
- exterior sheet 36 is either preserved spruce/pine/fir (“SPF”) or preserved oriented strand board (“OSB”) plywood, and interior sheet 34 is non-preserved OSB.
- SPF preserved spruce/pine/fir
- OSB preserved oriented strand board
- insulation 38 is expanded polystyrene (“EPS”), which is a material known to have “closed-cell” structure, meaning it comprises a structure of generally unconnected air pores within a matrix of polystyrene.
- EPS expanded polystyrene
- closed-cell materials such as EPS are impermeable to moisture and liquids, as no route exists for moisture to travel through the material.
- closed-cell materials are airtight, and consequently provide superior thermal insulating properties as compared to fiberglass, which has what can be described as an “open cell” structure and which is therefore not inherently airtight.
- SIPs 20 may be used with a moisture barrier covering one or both sheets 34 , 36 , depending on the requirements of local building and construction codes.
- a moisture barrier 40 that serves to block the entry of moisture into SIPs 20 from either side.
- Such moisture is typically in the form of either atmospheric humidity or ground water, the latter of which may be present within the exterior 24 , specifically below grade 42 and within gravel backfill 44 .
- the material and thickness of moisture barrier 40 is selected in accordance with local building and construction codes and in this embodiment, moisture barriers 40 are polyethylene sheets having a thickness of 0.15 mm (6 mil).
- moisture barriers 40 aid in blocking the flow of water around SIPs 20 such as, for example, through the joints formed between adjacent SIPs 20 , or through the joints formed between SIPs 20 and footing 30 .
- Each SIP 20 also comprises a recess formed in the upper surface of insulation 38 that is sized to accommodate a top plate 46 , as shown in FIG. 1 .
- Top plate 46 comprises one or more horizontally-oriented lumber boards having a width comparable to the thickness of insulation 38 .
- top plate 46 comprises two stacked horizontal boards of lumber, known in the art as a “double plate” configuration.
- Top plate 46 serves two functions. Firstly, top plate 46 provides a wood body atop SIP 20 to which abutting lumber may be fastened, such as by nails, screws, plates, or any other suitable fastener. This may facilitate the fastening of floor joist system 26 to SIP 20 , for example.
- top plate 46 provides lateral support at the top of SIP 20 to evenly distribute loads both along the length and across the thickness of SIP 20 .
- top plate 46 distributes the vertical load imposed by floor joist system 26 and upper outer wall 28 evenly along the length and across the thickness of SIP 20 .
- the bottom surface of the insulation 38 is aligned with the bottom surfaces of the sheets 34 and 36 giving the SIP 20 a generally flat, planar bottom surface.
- each SIP 20 is supported directly by footing 30 in the absence of a bottom plate, owing to the inherent strength of SIP 20 .
- This absence of a bottom plate allows the quantity of material required to fabricate each SIP 20 to be reduced, which in turn results in a lower cost as compared to other, conventional structural insulated panels.
- SIPs 20 can be fabricated using only 20% of the lumber that would be required to construct a conventional lumber stud wall of the same size.
- the SIPs 20 may alternatively be supported on a footing of a compacted gravel bed 72 , as shown in FIG. 2 b.
- plywood support strips 33 may be placed between the base of the SIPs 20 and the compacted gravel bed 72 .
- plywood support strips 33 have a width greater than the width of the SIPs 20 , and serve to distribute the vertical load imposed by the SIPs 20 over a larger area of compacted gravel bed 72 so as to reduce local stresses.
- the material used for support strips 33 is selected according to local building and construction codes and in this embodiment, support strips 33 are preserved “SPF” plywood.
- FIG. 3 a shows a lumber spline joint in which a vertically-oriented lumber spline 50 is accommodated within vertical recesses formed in facing sides of the insulation 38 of two adjacent SIPs 20 .
- spline 50 comprises a single lumber board having dimensions commensurate with the size of the combined recesses.
- Strips of caulking 52 are provided along the seams formed between the abutting interior sheets 34 and the abutting exterior sheets 36 of the SIPs 20 .
- Moisture barriers 40 cover the interior sheets 34 and exterior sheets 36 of both SIPs 20 . Caulking 52 and moisture barriers 40 serve to block the passage of moisture through the joint formed between SIPs 20 .
- FIG. 3 b shows a SIP spline joint in which a SIP spline 54 is accommodated within vertical recesses formed in facing sides of the insulation 38 of two adjacent SIPs 20 .
- SIP spline 54 has a similar cross-sectional structure to each SIP 20 , and comprises a volume of expandable foam 39 sandwiched between two appropriately-sized sheets 35 .
- OSB oriented strand board
- strips of caulking 52 are provided along the seams formed between the abutting interior sheets 34 and the abutting exterior sheets 36 of the SIPs 20 .
- Moisture barriers 40 cover the interior sheets 34 and exterior sheets 36 of both SIPs. Caulking 52 and moisture barriers 40 serve to block the passage of moisture through the joint formed between SIPs 20 .
- FIGS. 4 a to 4 c A foundation corner configuration formed by two abutting SIPs 20 is illustrated in FIGS. 4 a to 4 c.
- Vertical recesses are formed in adjacent sides of the insulation 38 of the SIPs 20 .
- An end plate 56 which in the embodiment shown, is a lumber board having dimensions commensurate with those of the vertical recess, as depicted in FIG. 4 b, is accommodated by each vertical recess.
- a cover strip 58 is used to cover each end plate 56 to provide protection from exterior 24 .
- the material used for each cover strip 58 is selected according to local building and construction codes and in this embodiment, each cover strip 58 is preserved “SPF” plywood.
- FIG. 4 a Also shown in FIG. 4 a is an electrical conduit 60 , which comprise a vertical bore provided through the insulation 38 . Electrical conduits 60 are typically positioned at regular intervals along the length of the SIPs 20 , and provide channels within the SIPs 20 for accommodating electrical wiring. Plumbing chases can be cut onsite as needed.
- FIG. 4 c shows the top plate arrangement for the corner configuration. As can be seen the lengths of the two boards forming each top plate are staggered in a manner to allow the boards of the top plates 46 to overlap at the corner and form a flush top plate.
- One or more SIPs 20 forming the foundation wall 18 can be configured to accommodate an opening, such as for a door or a window.
- FIG. 5 shows a SIP 520 that comprises an opening for a window.
- SIP 520 is a modification of SIP 20 , from which a portion has been removed to create the opening, and this opening is bordered by a window frame comprising a sill plate 62 , two jack studs 64 , and a lintel 66 . As revealed by the cutaways, lintel 66 rests upon jack studs 64 , which are themselves connected to sill plate 62 by angle irons.
- each SIP 620 comprises an interior sheet 634 and an exterior sheet 636 bonded to insulation 638 .
- the vertical side surfaces of the interior sheets 634 and exterior sheets 636 of the SIPs 620 carrying mating formations in this case tongues 668 and grooves 670 as shown in FIG. 6 b.
- Tongue 668 is accommodated within groove 670 at the seams between the sheets 634 and 636 , as is known in the art.
- Caulking 652 and caulking 653 together with moisture barriers 640 , serve to block the passage of moisture through the joint formed between SIPs 620 .
- the caulking 652 provided along the seam formed between the exterior sheets 636 of the SIPs 620 has been made semi-transparent so as not to obscure the visibility of tongue 668 and groove 670 . It will be appreciated that this lap joint, in which a connecting spline is absent, further reduces the quantity of lumber used in the foundation wall by an amount on the order of 50%, as compared to the joint depicted in FIG. 3 a.
- FIG. 7 a shows a frost wall comprising a plurality of abutting, generally upright SIPs 720 that define vertical walls in the foundation of a residential structure, such as a house, and that Support loads imposed by the structure above.
- the upper ends of SIPs 720 support floor 726 and upper outer walls 728 .
- the lower ends of SIPs 720 are supported by a concrete footing 730 .
- Each SIP 720 has a generally sandwich-type structure that provides high strength both axially (i.e. along both the vertical and horizontal axes) and in bending. Unlike SIPs 20 , SIPs 720 are surrounded by gravel backfill 744 on both sides, as depicted in FIG. 7 a. Consequently, each SIP 720 comprises exterior sheets 736 on both sides of a layer of expanded foam insulation 738 .
- the material used for the exterior sheets 736 is selected according to local building and construction codes (e.g. CAN/CSA S406-M92, “Construction of Preserved Wood Foundations”). In this embodiment, each exterior sheet 736 is preserved “SPF” plywood.
- the exterior sheets 736 are bonded to the insulation 738 , which in this embodiment is EPS, or other suitable material which has a “closed-cell” structure as described above.
- the insulation 738 which in this embodiment is EPS, or other suitable material which has a “closed-cell” structure as described above.
- Each SIPs 720 also comprises a recess formed in the upper surface of insulation 38 that is sized to accommodate a top plate 746 .
- top plate 746 comprises one or more horizontally-oriented lumber boards having a width commensurate with the thickness of insulation 738 .
- top plate 746 has a double plate configuration and comprises two such horizontal boards.
- Top plate 746 serves two functions, namely to provide a lumber surface to which abutting lumber may be fastened, and to also provide support at the top of SIP 720 to evenly distribute vertical loads both along the length and across the thickness of SIP 720 .
- top plate 746 distributes the vertical load imposed by floor 726 and upper outer wall 728 evenly upon the length and thickness of SIP 720 .
- each SIP 720 can be placed upon a concrete footing 730 , as shown in FIG. 7 a, or upon a footing comprising a compacted gravel bed 772 , as shown in FIG. 7 b.
- butt joints are used to join adjacent SIPs 720 , as depicted in FIG. 8 .
- FIGS. 9 a to 9 f depict several methods for providing this lateral support.
- FIGS. 9 a and 9 b depict the use of two lumber blocks 774 placed in an abutting relationship on either side of the butt joint formed between two adjacent SIPs 720 .
- FIGS. 9 c and 9 d depict the use of two angle irons 778 placed in an abutting relationship on either side of a butt joint formed between two adjacent SIPs 720 .
- Angle irons 778 are fastened both to footing 730 and to SIPs 720 using fasteners 780 and 781 , respectively.
- Fasteners 780 and 781 may be any suitable fastener known in the art.
- FIGS. 9 e and 9 f depict the use of a U-channel 782 placed around the bottom of abutting SIPs 720 .
- U-channel 782 is typically used when the footing is a compacted gravel bed 772 and in the absence of any concrete footing 730 , as depicted in FIG. 7 b.
- lumber blocks 774 , angle irons 778 , and U-channel 782 provide lateral support and alignment of the base of the butt joint only and in a temporary fashion, such as until the addition of gravel backfill 744 , and do not supply any significant structural support to SIPs 720 that would otherwise be provided by any bottom plate.
- FIG. 10 shows a top view of a frost wall corner configuration formed between two adjacent SIPs 720 . Similar to the corner configuration shown in FIGS. 4 a and 4 b, vertical recesses are provided in adjacent sides of the insulation 738 of adjacent SIPs 720 . End plates 756 and 757 are accommodated by the vertical recesses. In the embodiment shown, end plates 756 and 757 are identically sized, but are of different materials owing to their different operating environments. As end plate 757 has direct exposure to gravel backfill 744 , the material used for end plate 757 is selected in accordance with local construction and building codes, and in this embodiment is preserved wood. In contrast, end plate 756 does not have direct exposure to gravel backfill 744 and consequently experiences a different and milder operational environment. In this embodiment, end plate 756 is standard (non-preserved) “SPF” lumber.
- the material used for the sheets of the above embodiments is referred to as being plywood, preserved plywood, oriented strand board, or preserved oriented strand board, those of skill in the art will appreciate that the material used for the sheets may be of any suitable material known in the art.
- the insulation of the above embodiments is referred to as being EPS, those of skill in the art will appreciate that the insulation may be any of expanded polystyrene, extruded polystyrene, and/or polyurethane foam, or any other suitable insulating foam having similar mechanical, structural, and/or thermal properties known in the art.
Abstract
A foundation wall comprises a plurality of abutting, generally upright structural insulated panels, each of the panels comprising a slab of insulation sandwiched between first and second sheets and a top plate adjacent the top of the panel and overlaying the insulation. The lower end of the panel is devoid of a bottom plate.
Description
- The present invention relates generally to building structures and particularly to a structural insulated panel for a foundation wall and to a foundation wall incorporating the same.
- Structural insulated panels (“SIPs”) are an increasingly common material used in the construction of residential homes and other structures. Conventional SIPs have a sandwich-type structure, and comprise two sheets typically of a wood-based material, such as plywood or oriented strand board (“OSB”), that are bonded to an inner slab or foam insulation. Expanded polystyrene (“EPS”) is typically used for the insulation, with extruded polystyrene and polyurethane foam sometimes being used. The bonded sandwich structure of SIPs has been demonstrated to provide comparable strength to conventional walls consisting of a lumber stud frame filled with slabs of fiberglass insulation. SIPs are typically fabricated as sheets of a standard size (e.g. 4 feet×8 feet), which can then be cut to size on-site as needed prior to installation.
- A key advantage of SIPs over conventional fiberglass/lumber stud walls is the superior thermal insulating performance offered by the closed cell structure of expanded polystyrene, which consists of a network of closed pockets of air trapped in the polystyrene. This closed cell structure results in the foam insulation being both airtight, which is beneficial for thermal insulation, and impermeable to moisture, which prevents the occurrence of water-related damage such as rotting and mould growth that could otherwise occur in “open cell” insulation materials such as fiberglass.
- A number of SIP designs have been considered. For example, U.S. Pat. No. 6,279,287 to Meadows discloses a prefabricated building panel that includes first and second side panel members. A thermally insulating core is disposed between the panel members. A first panel end surface includes a pair of spaced projections defining a channel-way, while a second panel end surface includes a pair of spaced channels separated by a plug. Two adjacent building panels may be interconnected by engaging the pair of projections at the first end with the pair of channels and plug at the second end.
- U.S. Pat. No. 6,599,621 to Porter discloses a flat structural panel for building construction that includes an inner insulating core of plastic foam and a pair of opposed outer facings, or sheets, bonded to the insulated core. One of the outer facings is of gypsum composite, or gypsum fiberboard, while the other outer facing is of a special plastic-impregnated OSB. The gypsum and OSB facings form the inner and outer surfaces of the panel. The facings provide high tensile strength, with the gypsum composite or fiberboard facing also providing resistance to fire and insects.
- U.S. Patent Application Publication No. 20060117689 to Onken et al. discloses an insulated structural panel formed with a rigid foam core, a plurality of vertical hat channels on either face of the rigid foam core, and horizontal top and bottom L-channels on either face of the rigid foam core. The plurality of vertical hat channels on opposing faces of the rigid foam core is connected so as to compress the rigid foam core, thus adding structural strength to the insulated structural panel.
- While more commonly used for above-ground walls of residential structures, the high strength and impermeability to moisture also render SIPs suitable for use as foundation walls. In these applications, a portion of the wall is below grade (i.e. below the ground surface), and the base of the foundation wall is typically placed upon a footing, which can either comprise a solid surface, such as a concrete pad, or a hard particulate bed, such as compacted gravel.
- Although the axial and bending strengths of SIPs are known to be high, conventional SIPs typically require additional support along both their top and bottom surfaces. This support is typically provided by either one or more longitudinal strips of lumber secured to the top and bottom surfaces of the SIPs (commonly referred to as a “plates”), or U-shaped, longitudinally extending bands secured to the top and bottom surfaces of the SIPs. While the plates and bands contribute to the overall strength of the SIPs, they add to the quantity of material used in their construction and thereby increase cost.
- It is therefore an object to provide a novel structural insulated panel and a foundation wall incorporating the same.
- Accordingly, in one aspect there is provided a foundation wall comprising: a plurality of abutting, generally upright structural insulated panels, each of the panels comprising a slab of insulation sandwiched between first and second sheets and a top plate adjacent the top of said panel aid overlaying said insulation, the lower end of said panel being devoid of a bottom plate.
- In another aspect, there is provided a structural insulated panel comprising: a first sheet; a second sheet; and insulation sandwiched between and bonded to the first and second sheets, wherein the first and second sheets and insulation are configured to define a generally planar, bottom surface of said panel.
- In still another aspect, there is provided a structural insulated panel comprising: a first and second sheet each bonded to a respective first and second side of a slab of insulation, the sheets and insulation being configured to define generally planar, side surfaces of said panel.
- Embodiments will now be described more fully with reference to the accompanying drawings in which:
-
FIG. 1 is a cross-sectional side view of a foundation wall comprising a plurality of abutting structural insulated panels (“SIPs”); -
FIGS. 2 a and 2 b are cross-sectional side views of a base of the foundation wall ofFIG. 1 supported by concrete and compacted gravel footings, respectively; -
FIGS. 3 a and 3 b are cross-sectional top views showing a lumber spline joint and a SIP spline joint, respectively, formed between two adjacent SIPs in the foundation wall ofFIG. 1 ; -
FIGS. 4 a, 4 b, and 4 c are isometric, cross-sectional top, and isometric views, respectively, showing a corner configuration formed between two adjacent SIPs in the foundation wall ofFIG. 1 ; -
FIG. 5 is an isometric view of a SIP in the foundation wall ofFIG. 1 having a window opening therein; -
FIGS. 6 a and 6 b are cross-sectional top views showing a lap joint formed between two adjacent SIPs in a foundation wall; -
FIGS. 7 a and 7 b are cross-sectional side views of a frost wall comprising abutting SIPs supported by concrete and compacted gravel footings, respectively; pFIG. 8 is a cross-sectional top view showing a butt joint formed between two adjacent SIPs in the frost wall ofFIGS. 7 a and 7 b; -
FIGS. 9 a to 9 f are cross-sectional views showing temporary lateral supports used with the butt joint ofFIG. 8 ; and -
FIG. 10 is a cross-sectional top view showing a corner configuration formed between two adjacent SIPs in the front wall ofFIGS. 7 a and 7 b. - Turning now to
FIG. 1 , a foundation wall is shown and is generally identified by reference numeral 18. In this embodiment, foundation wall 18 comprises a plurality of abutting, generally upright structural insulated panels (“SIPs”) 20 that define vertical walls in the foundation of a residential structure, such as a house, and that separate aninterior 22 of a living space in a lower level or basement of the residential structure from anexterior 24 of the residential structure. At the same time,SIPs 20 provide support for loads imposed by the residential structure aboveSIPs 20. In the embodiment shown,SIPs 20 provide support for afloor joist system 26 and upperouter walls 28. The lower ends ofSIPs 20 are supported byfooting 30, which is typically a concrete pad, as shown inFIG. 2 a.SIPs 20 andfooting 30 are arranged in an abutting relationship with screedboards 31 andconcrete slab 32, the latter of which serves as a floor ofinterior 22. - Each
SIP 20 has a generally sandwich-type structure that provides high strength both axially (i.e. along the vertical and horizontal axes) and in bending. In particular, eachSIP 20 comprises aninterior sheet 34, which faces interior 22 of the residential structure and anexterior sheet 36, which facesexterior 24. The materials used forinterior sheet 34 andexterior sheet 36 are selected according to local building and construction codes for preserved wood foundations (e.g. CAN/CSA S406-M92, “Construction of Preserved Wood foundations”, a standard required by the 1995 National Building Code of Canada). In this embodiment,exterior sheet 36 is either preserved spruce/pine/fir (“SPF”) or preserved oriented strand board (“OSB”) plywood, andinterior sheet 34 is non-preserved OSB. Occupying the volume between and bonded tosheets foam insulation 38. In this embodiment,insulation 38 is expanded polystyrene (“EPS”), which is a material known to have “closed-cell” structure, meaning it comprises a structure of generally unconnected air pores within a matrix of polystyrene. As is known in the art, closed-cell materials such as EPS are impermeable to moisture and liquids, as no route exists for moisture to travel through the material. Similarly, closed-cell materials are airtight, and consequently provide superior thermal insulating properties as compared to fiberglass, which has what can be described as an “open cell” structure and which is therefore not inherently airtight. -
SIPs 20 may be used with a moisture barrier covering one or bothsheets FIGS. 1 and 2 a,interior sheet 34 andexterior sheet 36 are covered on their outer surfaces by arespective moisture barrier 40 that serves to block the entry of moisture intoSIPs 20 from either side. Such moisture is typically in the form of either atmospheric humidity or ground water, the latter of which may be present within theexterior 24, specifically belowgrade 42 and withingravel backfill 44. The material and thickness ofmoisture barrier 40 is selected in accordance with local building and construction codes and in this embodiment,moisture barriers 40 are polyethylene sheets having a thickness of 0.15 mm (6 mil). Although the inherent moisture impermeability of EPS, as described above, renders the use of one ormore moisture barriers 40 somewhat redundant,moisture barriers 40 aid in blocking the flow of water aroundSIPs 20 such as, for example, through the joints formed betweenadjacent SIPs 20, or through the joints formed betweenSIPs 20 andfooting 30. - Each
SIP 20 also comprises a recess formed in the upper surface ofinsulation 38 that is sized to accommodate atop plate 46, as shown inFIG. 1 .Top plate 46 comprises one or more horizontally-oriented lumber boards having a width comparable to the thickness ofinsulation 38. In the embodiment shown,top plate 46 comprises two stacked horizontal boards of lumber, known in the art as a “double plate” configuration.Top plate 46 serves two functions. Firstly,top plate 46 provides a wood body atopSIP 20 to which abutting lumber may be fastened, such as by nails, screws, plates, or any other suitable fastener. This may facilitate the fastening offloor joist system 26 toSIP 20, for example. Secondly,top plate 46 provides lateral support at the top ofSIP 20 to evenly distribute loads both along the length and across the thickness ofSIP 20. In the embodiment shown,top plate 46 distributes the vertical load imposed byfloor joist system 26 and upperouter wall 28 evenly along the length and across the thickness ofSIP 20. The bottom surface of theinsulation 38 is aligned with the bottom surfaces of thesheets - As shown
FIGS. 1 and 2 a, the bottom surface or base of eachSIP 20 is supported directly by footing 30 in the absence of a bottom plate, owing to the inherent strength ofSIP 20. This absence of a bottom plate allows the quantity of material required to fabricate eachSIP 20 to be reduced, which in turn results in a lower cost as compared to other, conventional structural insulated panels. Moreover, as compared to lumber stud/fiberglass walls,SIPs 20 can be fabricated using only 20% of the lumber that would be required to construct a conventional lumber stud wall of the same size. - Rather than supporting the
SIPs 20 on aconcrete footing 30, theSIPs 20 may alternatively be supported on a footing of a compactedgravel bed 72, as shown inFIG. 2 b. In this case, plywood support strips 33 may be placed between the base of theSIPs 20 and the compactedgravel bed 72. In the embodiment shown, plywood support strips 33 have a width greater than the width of theSIPs 20, and serve to distribute the vertical load imposed by theSIPs 20 over a larger area of compactedgravel bed 72 so as to reduce local stresses. The material used for support strips 33 is selected according to local building and construction codes and in this embodiment, support strips 33 are preserved “SPF” plywood. - A variety of joints may be used to join abutting
SIPs 20 of the foundation wall 18 andFIGS. 3 a and 3 b show two such exemplary joints.FIG. 3 a shows a lumber spline joint in which a vertically-orientedlumber spline 50 is accommodated within vertical recesses formed in facing sides of theinsulation 38 of twoadjacent SIPs 20. In the embodiment shown,spline 50 comprises a single lumber board having dimensions commensurate with the size of the combined recesses. Strips ofcaulking 52 are provided along the seams formed between the abuttinginterior sheets 34 and the abuttingexterior sheets 36 of theSIPs 20.Moisture barriers 40 cover theinterior sheets 34 andexterior sheets 36 of bothSIPs 20.Caulking 52 andmoisture barriers 40 serve to block the passage of moisture through the joint formed betweenSIPs 20. -
FIG. 3 b shows a SIP spline joint in which aSIP spline 54 is accommodated within vertical recesses formed in facing sides of theinsulation 38 of twoadjacent SIPs 20.SIP spline 54 has a similar cross-sectional structure to eachSIP 20, and comprises a volume ofexpandable foam 39 sandwiched between two appropriately-sized sheets 35. Assheets 35 are exposed to interior conditions only, the material used for each of thesheets 35 is either oriented strand board (“OSB”) or plywood. Strips ofcaulking 52 are provided along the seams formed between the abuttinginterior sheets 34 and the abuttingexterior sheets 36 of theSIPs 20.Moisture barriers 40 cover theinterior sheets 34 andexterior sheets 36 of both SIPs.Caulking 52 andmoisture barriers 40 serve to block the passage of moisture through the joint formed betweenSIPs 20. - A foundation corner configuration formed by two abutting
SIPs 20 is illustrated inFIGS. 4 a to 4 c. Vertical recesses are formed in adjacent sides of theinsulation 38 of theSIPs 20. Anend plate 56 which in the embodiment shown, is a lumber board having dimensions commensurate with those of the vertical recess, as depicted inFIG. 4 b, is accommodated by each vertical recess. Acover strip 58 is used to cover eachend plate 56 to provide protection fromexterior 24. The material used for eachcover strip 58 is selected according to local building and construction codes and in this embodiment, eachcover strip 58 is preserved “SPF” plywood. - Also shown in
FIG. 4 a is anelectrical conduit 60, which comprise a vertical bore provided through theinsulation 38.Electrical conduits 60 are typically positioned at regular intervals along the length of theSIPs 20, and provide channels within theSIPs 20 for accommodating electrical wiring. Plumbing chases can be cut onsite as needed.FIG. 4 c shows the top plate arrangement for the corner configuration. As can be seen the lengths of the two boards forming each top plate are staggered in a manner to allow the boards of thetop plates 46 to overlap at the corner and form a flush top plate. - One or
more SIPs 20 forming the foundation wall 18 can be configured to accommodate an opening, such as for a door or a window.FIG. 5 shows a SIP 520 that comprises an opening for a window. SIP 520 is a modification ofSIP 20, from which a portion has been removed to create the opening, and this opening is bordered by a window frame comprising a sill plate 62, twojack studs 64, and alintel 66. As revealed by the cutaways,lintel 66 rests uponjack studs 64, which are themselves connected to sill plate 62 by angle irons. - While the vertical sides of the
insulation 38 of theSIPs 20 are typically recessed to accommodate an end plate or spline, as shown for example inFIGS. 3 a to 4 b, the recesses can be omitted. In this case, lap joints can be formed betweenadjacent SIPs 20 as depicted inFIG. 6 a, which shows two abuttingSIPs 620. As withSIP 20 described inFIGS. 1 to 5 , eachSIP 620 comprises aninterior sheet 634 and anexterior sheet 636 bonded toinsulation 638. To facilitate the connection betweenadjacent SIPs 620, the vertical side surfaces of theinterior sheets 634 andexterior sheets 636 of theSIPs 620 carrying mating formations, in thiscase tongues 668 andgrooves 670 as shown inFIG. 6 b.Tongue 668 is accommodated withingroove 670 at the seams between thesheets Caulking 652 and caulking 653, together withmoisture barriers 640, serve to block the passage of moisture through the joint formed betweenSIPs 620. Thecaulking 652 provided along the seam formed between theexterior sheets 636 of theSIPs 620 has been made semi-transparent so as not to obscure the visibility oftongue 668 andgroove 670. It will be appreciated that this lap joint, in which a connecting spline is absent, further reduces the quantity of lumber used in the foundation wall by an amount on the order of 50%, as compared to the joint depicted inFIG. 3 a. - In addition to being used in a foundation wall, the SIPs can also be used in a frost wall.
FIG. 7 a shows a frost wall comprising a plurality of abutting, generallyupright SIPs 720 that define vertical walls in the foundation of a residential structure, such as a house, and that Support loads imposed by the structure above. In the embodiment shown, the upper ends ofSIPs 720support floor 726 and upperouter walls 728. The lower ends ofSIPs 720 are supported by aconcrete footing 730. - Each
SIP 720 has a generally sandwich-type structure that provides high strength both axially (i.e. along both the vertical and horizontal axes) and in bending. UnlikeSIPs 20,SIPs 720 are surrounded bygravel backfill 744 on both sides, as depicted inFIG. 7 a. Consequently, eachSIP 720 comprisesexterior sheets 736 on both sides of a layer of expandedfoam insulation 738. The material used for theexterior sheets 736 is selected according to local building and construction codes (e.g. CAN/CSA S406-M92, “Construction of Preserved Wood Foundations”). In this embodiment, eachexterior sheet 736 is preserved “SPF” plywood. Similar to the previous embodiments, theexterior sheets 736 are bonded to theinsulation 738, which in this embodiment is EPS, or other suitable material which has a “closed-cell” structure as described above. AsSIPs 720 do not separate an interior living space from an exterior of a residential structure, no moisture barriers are required to be used withSIPs 720. - Each
SIPs 720 also comprises a recess formed in the upper surface ofinsulation 38 that is sized to accommodate atop plate 746. Similar totop plate 46,top plate 746 comprises one or more horizontally-oriented lumber boards having a width commensurate with the thickness ofinsulation 738. In the embodiment shown,top plate 746 has a double plate configuration and comprises two such horizontal boards.Top plate 746 serves two functions, namely to provide a lumber surface to which abutting lumber may be fastened, and to also provide support at the top ofSIP 720 to evenly distribute vertical loads both along the length and across the thickness ofSIP 720. In the embodiment shown,top plate 746 distributes the vertical load imposed byfloor 726 and upperouter wall 728 evenly upon the length and thickness ofSIP 720. - The inherent strength of the
SIPs 720 allows them to be used in the absence of a bottom plate. The base of eachSIP 720 can be placed upon aconcrete footing 730, as shown inFIG. 7 a, or upon a footing comprising a compactedgravel bed 772, as shown inFIG. 7 b. - As the vertical sides of the
SIPs 720 are flush and free of recesses, butt joints are used to joinadjacent SIPs 720, as depicted inFIG. 8 . - During construction of a frost
wall using SIPs 720, it may be useful to provide some temporary support at the base of each butt joint betweenadjacent SIPs 720. For example, some lateral support applied at the base of eachSIP 720 can aid in the alignment and the support of the assembled frost wall prior to backfilling.FIGS. 9 a to 9 f depict several methods for providing this lateral support.FIGS. 9 a and 9 b depict the use of twolumber blocks 774 placed in an abutting relationship on either side of the butt joint formed between twoadjacent SIPs 720. Eachlumber block 774 is secured tofooting 730 usingfasteners 776, which can be selected from any fastener known in the art such as, but not limited to, nails, screws or bolts.FIGS. 9 c and 9 d depict the use of twoangle irons 778 placed in an abutting relationship on either side of a butt joint formed between twoadjacent SIPs 720.Angle irons 778 are fastened both tofooting 730 and toSIPs 720 usingfasteners Fasteners FIGS. 9 e and 9 f depict the use of a U-channel 782 placed around the bottom of abuttingSIPs 720. U-channel 782 is typically used when the footing is a compactedgravel bed 772 and in the absence of anyconcrete footing 730, as depicted inFIG. 7 b. As will be appreciated by one skilled in the art, lumber blocks 774,angle irons 778, andU-channel 782 provide lateral support and alignment of the base of the butt joint only and in a temporary fashion, such as until the addition ofgravel backfill 744, and do not supply any significant structural support toSIPs 720 that would otherwise be provided by any bottom plate. -
FIG. 10 shows a top view of a frost wall corner configuration formed between twoadjacent SIPs 720. Similar to the corner configuration shown inFIGS. 4 a and 4 b, vertical recesses are provided in adjacent sides of theinsulation 738 ofadjacent SIPs 720.End plates end plates end plate 757 has direct exposure togravel backfill 744, the material used forend plate 757 is selected in accordance with local construction and building codes, and in this embodiment is preserved wood. In contrast,end plate 756 does not have direct exposure togravel backfill 744 and consequently experiences a different and milder operational environment. In this embodiment,end plate 756 is standard (non-preserved) “SPF” lumber. - While a butt joint is described as being used between
adjacent SIPs 720 forming the frost wall, it will be appreciated that a similar butt joint may be used to join structural insulated panels in other applications. Similarly, while a lap joint is described as being used betweenadjacent SIPs 620 in a foundation wall, a similar lap joint may be used to join SIPs in other applications. - While the material used for the sheets of the above embodiments is referred to as being plywood, preserved plywood, oriented strand board, or preserved oriented strand board, those of skill in the art will appreciate that the material used for the sheets may be of any suitable material known in the art.
- While the insulation of the above embodiments is referred to as being EPS, those of skill in the art will appreciate that the insulation may be any of expanded polystyrene, extruded polystyrene, and/or polyurethane foam, or any other suitable insulating foam having similar mechanical, structural, and/or thermal properties known in the art.
- Although embodiments have been described above with reference to the accompanying drawings, those of skill in the art will appreciate that variations and modifications may be made without departing from the spirit and scope thereof as defined by the appended claims.
Claims (20)
1. A foundation wall comprising:
a plurality of abutting, generally upright structural insulated panels, each of the panels comprising a slab of insulation sandwiched between first and second sheets and a top plate adjacent the top of said panel and overlaying said insulation, the lower end of said panel being devoid of a bottom plate.
2. A foundation wall according to claim 1 wherein the insulation is expanded foam.
3. A foundation wall according to claim 1 wherein the insulation is expanded polystyrene.
4. A foundation wall according to claim 1 , wherein the first and second sheets are formed of material selected from the group comprising plywood, preserved plywood, oriented strand board, and preserved oriented strand board.
5. A foundation wall according to claim 1 , wherein adjacent panels are joined by butt joints.
6. A foundation wall according to claim 1 further comprising a recess formed in the insulation of each panel to accommodate said top plate, the sheets and insulation of each panel defining a flat panel bottom surface.
7. A foundation wall according to claim 1 wherein adjacent panels are joined by spline joints.
8. A foundation wall according to claim 6 wherein the bottom surfaces of said panels are supported by a footing.
9. A foundation wall according to claim 8 wherein said footing is one of a concrete footing and a compacted gravel bed.
10. A foundation wall according to claim 1 , wherein the foundation wall is a frost wall.
11. A structural insulated panel comprising:
a first sheet;
a second sheet; and
insulation sandwiched between and bonded to the first and second sheets, wherein the first and second sheets and insulation are configured to define a generally planar, bottom surface of said panel.
12. A structural insulated panel according to claim 11 wherein the insulation is expanded foam.
13. A structural insulated panel according to claim 11 wherein the insulation is expanded polystyrene.
14. A structural insulated panel according to claim 7 , wherein the first and second sheets are formed of material selected from the group comprising plywood, preserved plywood, oriented strand board, and preserved oriented strand board.
15. A structural insulated panel comprising:
a first and second sheet each bonded to a respective first and second side of a slab of insulation, the sheets and insulation being configured to define generally planar, side surfaces of said panel.
16. A structural insulated panel according to claim 15 wherein the insulation is expanded foam.
17. A structural insulated panel according to claim 15 wherein the insulation is expanded polystyrene.
18. A structural insulated panel according to claim 17 , wherein the first and second sheets are formed of material selected from the group comprising plywood, preserved plywood, oriented strand board, and preserved oriented strand board.
19. A wall structure comprising at least two structural insulated panels, each structural insulated panel comprising a first and second sheet each bonded to a respective first and second side of a slab of insulation, the sheets and insulation being configured to define generally planar, side surfaces of said panel, generally planar side surfaces of adjacent panels being in abutment.
20. Use of a structural insulated panel according to claim 11 in a foundation wall.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US12/248,552 US20100088981A1 (en) | 2008-10-09 | 2008-10-09 | Structural Insulated Panel for a Foundation Wall and Foundation Wall Incorporating Same |
CA2681951A CA2681951A1 (en) | 2008-10-09 | 2009-10-08 | Structural insulated panel for a foundation wall and a foundation wall incorporating same |
EP09172643A EP2186961A3 (en) | 2008-10-09 | 2009-10-09 | Structural insulated panel for a foundation wall and foundation wall incorporating same |
CN200910179038A CN101718127A (en) | 2008-10-09 | 2009-10-09 | Structural insulated panel for a foundation wall and foundation wall incorporating same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US12/248,552 US20100088981A1 (en) | 2008-10-09 | 2008-10-09 | Structural Insulated Panel for a Foundation Wall and Foundation Wall Incorporating Same |
Publications (1)
Publication Number | Publication Date |
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US20100088981A1 true US20100088981A1 (en) | 2010-04-15 |
Family
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Family Applications (1)
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US12/248,552 Abandoned US20100088981A1 (en) | 2008-10-09 | 2008-10-09 | Structural Insulated Panel for a Foundation Wall and Foundation Wall Incorporating Same |
Country Status (4)
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US (1) | US20100088981A1 (en) |
EP (1) | EP2186961A3 (en) |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US20110192566A1 (en) * | 2010-02-08 | 2011-08-11 | Dale Marshall | Thermal storage system for use in connection with a thermal conductive wall structure |
US20120317914A1 (en) * | 2011-06-20 | 2012-12-20 | Mark Bomberg | Continuous thermal insulation and fire protective composite placed on thermo-grid designed for wind load transfer |
RU2576701C1 (en) * | 2015-02-20 | 2016-03-10 | Степан Георгиевич Тигунцев | Method for construction of prefabricated buildings from panels |
US10392771B2 (en) * | 2017-02-09 | 2019-08-27 | Lancia Homes, Inc. | Foundation/sidewall construction method and kit |
US20200095764A1 (en) * | 2018-09-26 | 2020-03-26 | Ibacos, Inc. | Wood Foundation Walls and Foundations Formed with Such Walls |
US11293177B2 (en) * | 2018-09-26 | 2022-04-05 | Ibacos, Inc. | Wood foundation walls and foundations formed with such walls |
US20210172240A1 (en) * | 2019-12-05 | 2021-06-10 | Jim KIRSCHNER | Thermal-break assembly |
Also Published As
Publication number | Publication date |
---|---|
EP2186961A3 (en) | 2012-01-25 |
CA2681951A1 (en) | 2010-04-09 |
CN101718127A (en) | 2010-06-02 |
EP2186961A2 (en) | 2010-05-19 |
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Legal Events
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Owner name: THERMAPAN STRUCTURAL INSULATED PANELS INC.,CANADA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TARABA, JEFFREY M.;TARABA, EMIL M.;REEL/FRAME:022186/0508 Effective date: 20090119 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |