Roof flashing assembly

March 1, 1966

Η. H. EDWARDS

3,237,352

ROOF FLASHING ASSEMBLY

Filed March 6, 1963

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FIG 2

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INVENTOR.

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ATTORNEYS

3,237,352

Patented Mar. 1, 1966

United States Patent Office

237 352

ROOF FLASHING ASSEMBLY

Harlan H. Edwards, 900 University St, Seattle, Wash. Filed Mar. 6, 1963, Ser. No. 263,348

Claims. (CI. 52—60)

The present invention relates to an improved prefabricated roof flashing assembly for parapet walls providing not only flashing at the cove between the roof and the parapet wall, but also a facing for the inner wall surface and top of the parapet, and more specifically, relates to improvements in related embodiments of my earlier invention disclosed in my allowed copending application, Ser. No. 739,170, filed June 2, 1958.

The invention aims to provide such a flashing assembly which can be economically prefabricated, quickly installed or removed, uses a minimum of fastening means connected to the roof or parapet wall, effectively protects against the passage of water behind the roofing and also provides a durable weather-resistance surface for the top and inner face of the parapet wall, and requires a minimum of maintenance.

Other objects and advantages in view will appear and be understood in the following description and claims, the invention consisting in the novel construction and in the adaptation and combination of parts hereinafter described and claimed.

In the accompanying drawing:

FIG. 1 is a transverse vertical sectional view through a parapet wall flashing installation embodying the present invention.

FIG. 2 is a detail elevational view looking toward the inner face of the parapet wall at the juncture of two of the cap sections; and

FIG. 3 is a vertical sectional view taken along the line 3—3 of FIG. 2.

Referring to the drawings, it is seen that the flashing of the present invention comprises a base flashing 10, counter-flashing 11, facing 12, and cap 13, and that such is illustrated installed on a roof 14 and related parapet wall 15 having a nailing cap 16 at its top and a nailing strip 17 embedded therein along its inside face. Corrosion resisting sheet materials such as aluminum, galvanized iron, copper, resin-impregnated fiber sheets, etc., are preferred for the flashing components.

The base flashing 10 is nailed along its lower edge to the roof at 18 from which it is arched upwardly to the wall as a cove section 20 and is nailed at 21 to the strip 17. Along its upper edge the base flashing has an angle portion providing a hood flange 22 normal to the wall and a terminal skirt 23. As a complement to the angle 22-23, the facing 12 has a bottom lock-in angle 24 resting on the hood 22 and overlapping the skirt 23. This angle 24 has an upturned bottom lip 25 which fits over the lower edge of the skirt 23 to lock the bottom of the facing against lateral or upward displacement while it is held against downward movement by the hood 22. Upwardly from the angle 24 the facing 12 has a vertical planar portion 26 covering the inside face of the parapet wall above the base flashing 10. It is preferred that the facing extend all of the way to the top of the parapet wall before doubling back at a hem 27 which terminates by an outturned downwardly sloped lip 28. The resulting top shoulder 30 defines a straight support edge for the related portion of the overlying cap 13 should there be irregularities in the top surface of the parapet wall.

Continuing to the cap 13, it is seen that this member is generally channel shaped with the central web portion 31 functioning as the cap proper to cover the upper face of the wall. The outer flange 32 of the channel serves as the facia and has an outturned downwardly sloped • lower lip 33 to provide a drip-edge spaced outwardly from the wall. Similarly, the inner flange 34 of the cap has an outwardly sloped lower portion, but this doubles back to provide an edge hook 35 for locking over the 5 facing lip 28. This holds the upper portion of the facing 12 against lateral displacement as well as preventing water from working over the top of the facing. After final assembly, the interfit between the hook 35 and lip 28 also complements the top of the base flashing in holding the 10 facing from downward displacement relative to the parapet wall.

The counter-flashing 11 is formed at the top with a down-turned hook 36 for interfitting with the bottom lip 25 of the facing 12. From the bill portion of this hook 36 15 the counter-flashing extends toward the cove of the base flashing to bear by the shank portion 39 of the hook against the roofing, and then continues downwardly by outwardly and inwardly V forming sections 37, 38 respectively. The latter section deflects outwardly at the ²⁰ bottom by a basal lip 40 to preclude puncturing of the roofing by the lower marginal edge of the counter-flashing.

In installing my flashing assembly, after the roofing vapor barrier and insulation, if used, have been laid, the base flashing 10 is secured in position to the roof deck 14 and parapet wall 15 by nails 18 and 21 as before described. It is preferred that both sides of the base flashing be coated with sealer. Then installation of the roofing, both roofing paper and mopping, collectively denoted 41, can be completed. In this regard, the roofing is brought up ³⁰ against the hood flange 22. After application of the roofing the bottom lip 25 of the facing 12 is hooked over the lower edge of the skirt 23 with the facing sloped upwardly at about a forty-five degree angle with the wall, and then the upper end of the facing is swung against ³⁵ the wall. During this swinging action the lock-in angle is brought to bear on the outer portion of the hood flange 22 to support the facing without need of auxiliary fastening means until the cap 13 is installed. The latter is accomplished by first placing the hook 35 behind the upper facing lip 28 with the web portion 31 of the cap upright, and then the cap is swung downwardly to roll the hook over the lip 28 and bring the drip lip 33 down to the outer edge of the parapet wall, whereupon the outer r flange 32 of the cap is sprung thereover to bring the web ⁴⁰ 31 down against the top of the wall. To provide a seal at the ends of lengths of the facing and the cap while providing for expansion and contraction of the wall, the lengths may merely be overlapped about three inches. n However, in the case of the cap, I prefer to space the ^υ lengths thereof apart and cover the resulting expansion gaps with overlay straps 41 after applying caulking compound thereto. Each of these straps may have a hook 42 overfitting the cap hook 35 and an outer flange 43 55 overlapping the outer cap flange 32. The overlay straps are anchored by a respective pair of screws 42 provided with neoprene washers. These screws pass through the underlying gap between the related caps 13 and into the nailing cap 16, and thereby anchor the caps 13 to the θ parapet. The interlocks between the cap 13 and the upper end of the facing 12, and between the base flashing 11 and the lower end of the facing, not only effectively seal against the passage of water, but combine to anchor the flashing to the parapet wall without need of auxiliary fastening means. Assembly of the flashing is completed by installing the counter-flashing 11. This is easily accomplished by engaging the hook 36 over the upper edge of the bottom lip 25 of the facing 12 with the rest of the counter-flashing standing out from the wall, and then pushing the counter-flashing downwardly thereby forcing ^{i J} the elbow of the hook 36 to roll over the underlying portion of the roofing 41 and the bill of the hook to lodge

3,237,352 ³ behind the lip 25 and lock the counter-flashing in position. Such rolling of the hook 36 over the roofing 41 is yieldingly resisted by the skirt 23 and lip 25 which are sprung outwardly thereby and partially return to their initial unsprung position when the shank portion 39 of the counter-flashing comes into flat engagement with the roofing. Thus this spring action of the skirt 23 and lip 25 hold the shank portion 39 and the upper edge of the lower lip 40 of the counter-flashing snugly against the roofing. This keeps the upper part of the roofing from curling and assures maintenance of a seal between the roofing and the portion of the cove section 20 located above the nailing strip 17. The slope of the bottom face 38 of the counter-flashing is designed to divert strong winds away while taking advantage of the wind pressure to seal tighter at the bottom of the counter-flashing against water blowing therebehind.

If and when desired, the cap 10 and facing 12 can be quickly disassembled merely by removing the screws 42 to free the overlay strips 41. The counter-flashing 11 is free to be independently removed at any time. Removal of the base flashing 10 is accomplished by pulling of the nails 18 and 21.

It is thought that the invention will have been clearly understood from the foregoing detailed description. Changes in the details of construction will suggest themselves and may be resorted to without departing from the spirit of the invention, wherefore it is my intention that no limitations be implied and that the hereto annexed claims be given a scope fully commensurate with the broadest interpretation to which the employed language fairly admits.