US3323261A

US3323261A - Corrugated sheet flashing

Info

Publication number: US3323261A
Application number: US424416A
Authority: US
Inventors: Harlow T Richardson
Original assignee: Ruberoid Co
Current assignee: Ruberoid Co
Priority date: 1965-01-08
Filing date: 1965-01-08
Publication date: 1967-06-06
Anticipated expiration: 1984-06-06

Description

June 6, 1967 H. T. RICHARDSON CORRUGATED SHEET FLASHING Filed Jan; 8, 1965 INVENTOR. HARLOW T RICHARDSON ATTORNEYS United States Patent Filed Jan. 8, 1965, Ser. No. 424,416 4 Claims. (Cl. 52-90) This invention relates to flashing for cojoined corrugated sheets and, more particularly, to improved means for closing the juncture between a margin of one sheet which is transverse to its corrugations and the corrugated face of another sheet which extends across that margin.

Corrugated sheets serve quite well in various structures as siding, roofing and so on, but because of the crests and vales of the corrugations with which they are formed special measures must often be taken to seal junctures where the corrugated face of one such sheet extends across the margin of another sheet which is transverse to its corrugation. If this margin is simply squared off in the usual manner it extends across the corrugated face of the other sheet without closing the vales and crests of both sheets. For example, a building of corrugated sheets commonly has a horizontal eave where a roofing sheet slopes down to and overhangs a vertical siding sheet. The corrugations of both sheets are usually disposed perpendicular to their juncture at the eave, and therefore the margin of the siding sheet at the juncture is transverse to its corrugations and the corrugated underside of the roofing sheet lies over that margin. Flashing for sealing the juncture is provided on the outside of the building underneath the eave and it often takes the form of sheet metal or lead strips fitted into the opening corrugations of the underside of the roofing sheet and the outside of the siding sheet along the eave.

In United States Patent No. 2,641,340, alternate flashing means is described which involves mitering the siding sheet along the aforementioned margin oppositely to the slope of the roofing sheet at an angle equal to 45 minus half the slope of the roof, and aligning the crests of both the roofing and siding sheets as viewed from the outside of the building. This mitering imparts a wavy form to the margin of the siding sheet at the eave which generally conforms to the vertical section of crests and vales of the corrugations on the underside of the roofing sheet otherwise requiring some more cumbersome flashing material. While this particular mitering concept represents a certain advance in flashing design for the eave of a corrugated structure, it is not without significant disadvantages. For one thing, each corrugated sheet has a smoother face on what is to be its outside surface when installed and this face is uppermost when the sheet emerges from production and is shipped. The prior art mitering concept often requires that each sheet be turned upside down from this position to permit trimming of the angle cut in the factory and then reversed so that the smooth side is uppermost for shipping. Another disadvantage of the known mitering concept is that, since the wavy margin imparted to the siding sheet only approximates a fit with the overlying corrugated face of the roofing sheet, caulking must be applied on the outside of the bulding along the juncture at the cave to complete the seal, and the caulking com pound must adhere within the downwardly directed acute angle between the sheets to the underside of the roofing sheet and also against the exterior vertical face of the siding sheet where no underlying support for the compound is provided.

It is the purpose of the present invention to improve upon the mitering principle described in the aforementioned patent. In particular, the object of this invention is to permit the mitered surfaces to be trimmed in the factory without turning the sheets upside down as noted 3,323,261 Patented June 6, 1967 above, and to provide a kind of shelf for supporting the caulking compound where it can complete the seal on the outside of the juncture along the eave.

Broadly stated, the subject of the invention is a cojoined pair of corrugated sheets of the same corrugated configuration having crests and vales disposed substantially perpendicular to a juncture between the sheets. The first sheet extends beyond the margin of the second sheet which is transverse to the corrugations of the second sheet and defines an acute angle with the second sheet. In accordance with the invention this juncture is improved in that the crests of the first sheet are aligned with the vales of the second sheet as viewed from the acute angle side of the juncture, and the margin of the second sheet is mitered at an angle substantially parallel to a plane bisecting the acute angle between the sheets. In particular, the mitered margin of the second sheet is in a plane angled relative to a perpendicular from the second sheet at 45 plus half the complement of the acute angle.

Unlike the priorart mitering approach, the invention involves aligning the crests on one sheet with the vales (instead of the crests) of the other sheet as viewed from what is usually the outside of a structure, cutting the mitered surface in a direction which is generally the same as (rather than opposite to) the slope of the roofing sheet, and disposing the plane of the miter relative to the perpendicular at an angle of 45 plus (instead of minus) half the slope of the roofing sheet. The effect of these three basic departures from the prior art is to provide a cut which can be trimmed in the factory without even once turning each sheet upside down. Also, it provides angled shelf means on the outside of the juncture at the eave which lends support to caulking compound applied to seal the juncture. In addition, the caulking compounds can be disposed in this shelf means generally flush with the face of siding sheet, thus improving the appearance of the structure.

A preferred embodiment of the invention is described hereinbelow with reference to the accompanying drawing, wherein FIG. 1 is a fragmentary perspective of a horizontal eave with flashing in accordance with the invention;

FIG. 2 is an enlarged fragmentary section taken along the line 2-2 of FIG. 1; and

FIG. 3 is a fragmentary section taken along the line 3-3 of FIG. 2.

In this particular form of the invention, a corrugated roofing sheet 10 and siding sheet 12 are cojoined along the cave of a building. As viewed from the outside of the building, the roofing sheet 10 is formed with crests 14 and vales 16 of standard configuration and the siding sheet 12 is formed with similar crests 18 and vales 20. The crests and

valves

14 and 16 of the roofing sheet 10 and the crests and vales 18 and 20 of the siding sheet 12 are all disposed perpendicular to a horizontal juncture between the sheets, which in effect is along the eave of the building. The roofing sheet 10 sloped downwardly at an angle a from the horizontal which is most often 18 because the slope of typical corrugated roofing is 4 in 12. The roofing sheet 10 thus slopes down to and over the horizontal margin of the siding sheet 12 which is transverse to the crests 18 and vales 20 of the corrugated siding sheet 12. Together the roofing sheet 10 and siding sheet 12 define an acute angle 12 which in this example is on the outside of the building under the eave. The acute angle 12 is the complement of the slope angle a because together they equal The upper margin of the siding sheet 12 at the juncture with the roofing sheet 10 would leave openings defined by the crests and vales of the corrugations of both the roofing sheet 10 and the siding sheet 12 if the margin of the siding sheet 12 were simply squared off perpena dicular to its plane in the usual manner. The depth of these openings is indicated in FIG. 2 by the dimension x, and it is here that sheet metal or lead has been used to cover and seal the juncture in certain prior art approaches to the problem of flashing. In accordance with the invention no extra flashing elements of this sort are required. As viewed from the outside of the building, ie the acute angle b side of the juncture, the invention provides that the crests 18 of the siding sheet 12 be aligned with the vales 16 of theroofing sheet 10, as is shown most clearly in FIGS. 1 and 2. In FIG. 3, which is a section of the juncture viewed from the inside of the building opposite the acute angle 12, the rear face of these crests 18 and vales 20 of the siding sheet 12 are seen, and of course they appear in reverse.

In addition, the invention provides that the horizontal margin of the siding sheet 12 be formed with a mitered surface 22. This mitered surface 22 is in a plane sloping downwardly toward the outside (or acute angle side) of the juncture at a certain angle c relative to a perpendicular from the general plane of the siding sheet 12. The mitering angle is carefully chosen to best cover the juncture between the sheets and 12 at the eave and it is equal to 45 plus half the complement of the acute angle b, which is the same as the slope angle a of the roofing sheet.

By mitering the upper margin of the siding sheet 12 in this fashion, a wavy periphery is imparted to it as viewed in elevation (see FIG. 3) and this conforms quite closely to the vertical section through the corrugations of the roofing sheet 10. In no case will the .mitering angle 0 be less than 45. The face of the siding sheet 12 on the outside of the building (on the left in FIG. 2) is the smooth face of the sheet which is disposed upwardly when the sheets emerge from production in the factory, and the mitered surface 22 can be trimmed without turning each of the siding sheets 12 upside down.

An advantage of particular importance is that, when the siding sheet 12 is mitered as described, its thickness provides an angled shelf 24 on the outside of the juncture for convenient and secure reception of putty or other caulking compound 26 which may be applied under the eave to seal the juncture completely. In the aforementioned prior art mitered juncture, no such shelf 24 is possible because the smooth outside face of the siding sheet extends vertically upward to the underside of the roofing sheet and hence the caulking is provided with no underlying support. Roofing sheets expand to a considerably greater extent due to moisture absorbtion in use than their associated siding sheets because they are more exposed to precipitaation. As a result, there is relative motion between the sheets along their juncture and this tends to crack and even dislodge caulking compound which is not securely applied.

It is to be understood that this new concept of a mitered juncture between corrugated sheets is not limited to a horizontal eave between a downwardly sloping roofing sheet and a vertical siding sheet as described in the foregoing example. In the general sense the acute angle b is to be used as the reference side of the juncture for determining the direction of the mitered surface 22, and the acute angle b could be on the inside of a structure as well as the outside. Also, the upper face of the sheet 10 appearing in FIG. 2 could be on the inside instead of the outside of the structure. It is equally possible that the

sheets

10 and 12 could both be vertical siding sheets which are not perpendicular to one another, or that the sheet 10 could extend under instead of over the sheet 12. The scope of these and other evident variations in the invention is set forth in the following claims.

I claim:

1. In a cojoined pair of corrugated sheets of the same corrugated configuration having crests and vales disposed substantially perpendicular to a juncture between the sheets, the first sheet extending beyond a margin of the second sheet which is transverse to the corrugations of the second sheet and defining an acute angle with the second sheet, said juncture being improved in that (a) the crests of the first sheet are aligned with the vales of the second sheet as viewed from the acute angle side of the juncture;

(b) the margin of the second sheet is mitered at an angle substantially parallel to a plane bisecting the acute angle between the sheets; and

(c) the mitered periphery of the second sheet conforms closely to the crests and vales of the first sheet along the juncture.

2. A cojoined pair of corrugated sheets according to claim 1 wherein the mitered margin of the second sheet is in a plane angled relative to a perpendicular from the second sheet at 45 plus half the complement of said acute angle.

3. In a cojoined pair of corrugated roofing and vertical siding sheets of the same corrugated configuration having crests and vales disposed substantially perpendicular to a horizontal juncture between the sheets, the roofing sheet sloping down to and over a horizontal margin of the siding sheet which is transverse to the corrugations of the siding sheet and defining an acute angle with the siding sheet, said juncture being improved in that (a) the crests of the roofing sheet are aligned with the vales of the siding sheet as viewed from the acute angle side of the juncture,

(b) the margin of the siding sheet is mitered in a plane sloping downwardly toward the acute angle side of the juncture in a plane angled relative to a perpendicular from the siding sheet at 45 plus half the complement of said acute angle; and

4. A cojoined pair of corrugated roofing and siding sheets according to claim 3 wherein the mitered margin of the siding sheet forms sloping shelf means on the acute angle side of the juncture, and caulking means sealing said juncture are at least partly supported on said shelf means.

References Cited UNITED STATES PATENTS 168,260 9/1875 Lassig 1474 1,375,402 4/1921 McAvoy 5290 2,330,819 10/1943 Faure et al. 5290 2,641,340 6/1953 Howe 52-90 2,664,177 12/1953 Hammitt et al. 52-90 FOREIGN PATENTS 1,296,912 5/1962 France.

FRANK L. ABBOTT, Primary Examiner.

M. O, WARNECKE, Assistant Examiner,

Claims

1. IN A COJOINED PAIR OF CORRUGATED SHEETS OF THE SAME CORRUGATED CONFIGURATION HAVING CRESTS AND VALES DISPOSED SUBSTANTIALLY PERPENDICULAR TO A JUNCTURE BETWEEN THE SHEETS, THE FIRST SHEET EXTENDING BEYOND A MARGIN OF THE SECOND SHEET WHICH IS TRANSVERSE TO THE CORRUGATIONS OF THE SECOND SHEET AND DEFINING AN ACUTE ANGLE WITH THE SECOND SHEET, SAID JUNCTURE BEING IMPROVED IN THAT (A) THE CRESTS OF THE FIRST SHEET ARE ALIGNED WITH THE VALES OF THE SECOND SHEET AS VIEWED FROM THE ACUTE ANGLE SIDE OF THE JUNCTURE; (B) THE MARGIN OF THE SECOND SHEET IS MITERED AT AN ANGLE SUBSTANTIALLY PARALLEL TO A PLANE BISECTING THE ACUTE ANGLE BETWEEN THE SHEETS; AND (C) THE MITERED PERIPHERY OF THE SECOND SHEET CONFROMS CLOSELY TO THE CRESTS AND VALES OF THE FIRST SHEET ALONG THE JUNCTURE.