US2721819A

US2721819A - Flashing

Info

Publication number: US2721819A
Application number: US489717A
Authority: US
Inventors: Allison G Munro
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-02-21
Filing date: 1955-02-21
Publication date: 1955-10-25
Anticipated expiration: 1972-10-25

Description

Oct. 25,V 1955 A. G. MuNRo 2,721,819

v FLASHING Filed Feb. v21, 1955 /4 TTOP/VE'Y United States Patent O FLASHING Allison G. Munro, Garden City, N. Y. Application February 21, 1955, Serial No. 489,717

4 Claims. (Cl. 154-51) This invention relates to dampprooing masonry walls and it has for its object to provide a novel and improved flexible ashing material for that purpose.

Another object of the invention is to provide a tough and durable flashing of the above type which is economical to manufacture and install, and which forms an impenetrable barrier against moisture vapor as well as free water at all vulnerable points in masonry construction.

Still another object is to construct a flashing of the type specified which is not only highly lleXible and therefore readily conformable with the contour of brick and concrete walls, steel beams, etc., but'is also extensible in two directions and immune to fracture regardless of the way in which a building may settle.

Various other objects and advantages will be apparent as the nature of the invention is more fully disclosed.

Since no one has yet devised a masonry structure whichl is inherently leak-proof, it is customary in constructing modern buildings to employ moisture-resisting ashings or coatings of one kind or another to seal the many joints and seams that must of necessity be made waterproof. Typical flashings employed for this purpose consist of waterproofing sheets of paper treated with asphalt compositions, etc., which are laid between courses of brick, or on the concrete covering spandrel beams at floor levels, or wherever else protection is required.

The matter of cost, and limitations on bulk, militate against the use of some protective ashings heretofore proposed for the above purpose. The greatest problem, however, has been to devise a ilashing which is sufficiently exible, durable and at the same time expansible to insure close tting to the irregular contours of walls, columns, etc., without fracturing, and to avoid bursting or tearing due to careless construction practices as well as the subsequent effects of age and particularly the tendency of buildings to settle.

The present invention provides a novel and improved composite flexible, expansible flashing for dampproong masonry walls which avoids the foregoing disadvantages of the prior art. In its preferred form, my composite flashing comprises an inner core consisting of a moistureimpervious sheet of thermoplastic polyvinyl resin, tough membranes preferaby of brous material such as paper which cover both sides of the polyvinyl resin core and are thermoplastically bonded thereto, the whole assembly being creped or corrugated both longitudinally and transversely to permit same to stretch in two directions, and an outer coating of pliable, stretchable asphalt which covers both sides of the composite sheet and not only adheres tenaciously to the creped membranes but also constitutes a bonding agent with masonry.

The term dampproong is used herein in its broadest sense, and includes waterproong, rust-proofing, corrosionprooting, mildew-proofing, and the setting up of barriers against the passage of moisture vapor as well as free water. In all of the many situations in which my flashing may be used in the construction of a building its of this invention are set forth more in detail in the claims appended hereto, the nature and scope of the invention may be better understood by referring to the following description, taken in connection with the accompanying drawing forming a part thereof, in which a specific embodiment has been set forth for of illustration.

In the drawing: i. Fig. l is a vertical section through the wall of a building, illustrating the use of my flashing;

Fig. 2 is a diagrammatic view illustrating the first step in the manufacture of the ashing;

Fig. 3 is a broken plan view of before it is creped;

purposes Fig. 4 is a diagrammatic view illustrating the longitudinal creping or corrugating of the sheet;

Fig. 5 is a plan view of the sheet as itemerges ,from

the creping rolls of Fig. 4; i

Fig. 6 is a transverse section through said sheet, taken on line 6 6 of Fig. 4; Y A Fig 7 is a diagrammatic view illustrating thev transverse creping of the flashing; 'l v Fig. 8 is a plan view of the sheet as it emergesfrom the rolls of Fig. 7;

Fig. 9 is a broken plan view of theiinished sheet with the final coating of flexible, stretchable asphalt; andv Fig. 10 is a transverse section on line 10- 10 of Fig. 9.

In the following description certain specic terms are used for convenience in referring to the various details These terms, however, are to be im.

of the invention. terpreted as broadly as the state of the art will permit.

In the drawing, Fig. l shows a spandrel beam 1 supporting the concrete flooring 2 of a building, while 3 are the bricks forming the outer wall which are laid in the usual way with intermediate courses of mortar 4.

The flexible spandrel beam flashing sheets 5 forming the subject matter of the present invention are laid between the flooring 2 and the courses of brick 3, and are embedded in the surrounding mortar 4 as shown in Fig. 1. The construction of the ashing 5 will now be described.

The composite flashing comprises an inner core consisting of a moisture-impervious sheet 6 of thermoplastic polymerized vinyl resin such as a polyvinyl ester, polyvinyl acetate, polystyrene or the like, which is covered on both sides with fibrous membranes such as

tough paper membranes

7 and 8, as illustrated in Fig. 3. It may be fabricated by passing the three-ply sheet under pressure between smooth heated rolls 9 and 10, as shown in Fig. 2, causing the

membranes

7 and 8 to be thermoplastically bonded to the inner core 6. Fig. 3 shows the smooth composite sheet as it emerges from the rolls of Fig. 2.

The composite sheet as it appears in Fig, 3 is next creped or corrugated longitudinally, for example by passing same between the rolls 11 and 12 of Fig. 4. The rolls 11 and 12 are corrugated or grooved circumferentially in any desired manner, depending upon the shape, depth and number of corrugations to be impressed in the sheet. Figs. 5 and 6 show the sheet as it emerges the composite flashingfrom the rolls 11 and 12 of Fig. 4, and for purposes of illustration the corrugations are shown to be of angular V-shape and are designated by the reference numeral 14.

The longitudinallyrcreped sheet of Figs. and 6 is next creped or corrugated in a transverse direction, for example by passing same between the

rolls

15 and 16 of Fig. 7. These

rolls

15 and 16 may be corrugated or grooved transversely, or in a direction parallel to their axes, or they may be grooved diagonally or both transversely and diagonally to insure the desired stretch in more than one direction. Here again the configuration of the roll surfaces depends upon the shape, depth and number of corrugations to be impressed in the sheet. Fig. 8 shows the sheet as it emerges from the

rolls

15 and 16 of Fig. 7, and the cross-hatched surface designated by the reference numeral 17 indicates that the composite sheet is now creped both longitudinally and transversely, or also diagonally as described above, and is thus capable of stretching in more than one direction.

The composite sheet of Fig. 8, multi-creped as described above, is nally coated on both sides with any suitable soft, flexible, stretchable and plastic asphalt composition 18 which constitutes a bonding agent with masonry. Figs. 9 and l0 show the finished composite ashing, from which it will be seen that the asphalt coating 18 completely covers the composite corrugated sheet and gives the finished flashing a smooth surface which is readily bonded with the masonry as shown in Fig. 1.

To cite but one example of a moistureproof ilexible flashing embodying the invention, and fabricated as herein disclosed, two and a half pounds of asphalt composition were employed per nine square feet of flashing with a finished thickness of about one-sixteenth inch; tensile strength 500 lbs. per square inch; bursting strength 158 lbs; stretch over 22% without fracturing, in some cases 30% before tearing.

Although a specic embodiment has been shown and described herein for purposes of illustration, it will be evident to those skilled in the art that the invention is capable of various modications and adaptations within the scope of the appended claims.

The invention claimed is:

1. A composite exible, expansible flashing for dampproong masonry walls comprising an inner moistureimpervious sheet of thermoplastic polyvinyl resin, membranes covering both sides of said inner sheet and thermoplastically bonded thereto, the composite sheet being flexible and bendable and being creped both longitudinally and transversely permitting same to stretch in two directions, and flexible, stretchable plastic material covering both sides of said composite sheet whereby said sheet may be bonded to surrounding masonry structure.

2. A composite llexible, expansible flashing for dampproong masonry walls comprising an inner moistureimpervious sheet of thermoplastic polyvinyl resin, membranes covering both sides of said inner sheet and thermoplastically bonded thereto, the composite sheet being flexible and bendable and being creped both longitudinally and transversely permitting same to stretch in two directions, and a coating of exible, stretchable asphalt covering both sides of said composite sheet whereby said sheet may be bonded to surrounding masonry structure.

3. A composite flexible, eXpansible ilashing for dampproong masonry walls comprising an inner moistureimpervious sheet of thermoplastic polyvinyl resin, brous paper sheets covering both sides of said inner sheet and thermoplastically bonded thereto, the composite sheet being flexible and bendable and being corrugated both longitudinally and transversely permitting same to stretch in two directions, and a coating of flexible, stretchable asphalt covering both sides of said paper sheets and being bonded to corrugations thereof whereby said composite sheet may be bonded to surrounding masonry structure.

4. Method of making a composite exible, expansible flashing for dampprooling masonry walls which comprises thermoplastically bonding sheets of membranes to both sides of a moisture-impervious sheet of thermoplastic polyvinyl resin, creping the resulting composite sheet both longitudinally and transversely to permit it to stretch in two directions, and covering both sides of the creped sheet with a exible, stretchable plastic material which is bondable to surrounding masonry.

References Cited in the le of this patent UNITED STATES PATENTS 2,005,221 Cohen et al. lune 18, 1935 2,085,618 Walsh June 29, 1937 2,140,407 Schilling Dec. 13, 1938 2,203,822 Hyman June l1, 1940

Claims

3. A COMPOSITE FLEXIBLE, EXPANSIBLE FLASHING FOR DAMPPROOFING MASONRY WALLS COMPRISING AN INNER MOISTUREIMPERVIOUS SHEET OF THERMOSPLASTIC POLYVINYL RESIN, FIBROUS PAPER SHEETS COVERING BOTH SIDES OF SAID INNER SHEET AND THERMOPLASTICALLY BONDED THERETO, THE COMPOSITE SHEET BEING FLEXIBLE AND BENDABLE AND BEING CORRUGATED BOTH LONGITUDINALLY AND TRANSVERSELY PERMITTING SAME TO STRETCH IN TWO DIRECTIONS, AND A COATING OF FLEXIBLE, STRETCHABLE ASPHALT COVERING BOTH SIDES OF SAID PAPER SHEETS AND BEING BONDED TO CORRUGATIONS THEREOF WHEREBY SAID COMPOSITE SHEET MAY BE BONDED TO SURROUNDING MASONRY STRUCTURE.