US3086324A

US3086324A - Gravel stop and flashing for roofs

Info

Publication number: US3086324A
Application number: US757064A
Authority: US
Inventors: Cheney Allan
Original assignee: Individual
Current assignee: Individual
Priority date: 1958-08-25
Filing date: 1958-08-25
Publication date: 1963-04-23
Anticipated expiration: 1980-04-23

Description

April 23, 1963 A. CHENEY 3,086,324

GRAVEL STOP AND FLASHING FOR ROOFS Filed Aug. 25, 1958 2 Sheets-Sheet 1 IN VENTOR. )7/10/2 Wi /76y BY April 23, 1963 A. CHENEY 3,036,324

GRAVEL STOP AND FLASHING FOR ROOFS Filed Aug. 25, 1958 2 Sheets-Sheet 2 INVENTOR. kfZ/O/Z fiezzey. BY

aw/MA mawg United States Patent 3,086,324 GRAVEL STOP AND FLASHING FOR ROOFS Allan Cheney, 23 Edgerstoune Road, Princeton, NJ.

Filed Aug. 25, 1958, Ser. No. 757,064

2 Claims. (Cl. 50-66) The present invention relates to certain new and useful improvements in metal gravel stops to provide less expensive, ri-gid, strong gravel stops that expand and contract automatically.

Those who are conversant with flashing constructions and attending installation problems by roofers and sheet metal workers in the building industry are aware, of course, of the waviness, expansion buckles, fractured sharp bends and weakness of plain metal when formed into gravel stops in the ordinary tin shop. Plain metal gravel stops also require separate hold-down cleats at the bottom of the fascia to resist the uplift of the wind pressure.

More specifically, the invention relates to a combined gravel stop and flashing for roofs and, more particularly, to gravel and'mastic type roofing wherein the roofingis covered with tar roofing paper and a mastic and supported thereon is gravel, slag, crushed stone, and the like.

The invention consists in providing elongated met-a1 sheets which are provided with deep grooves transversely of the sheet for the purpose of giving much greater rigidity and strength to the sheet. The metal sheet is folded or bent along parallel longitudinal fold lines to provide an anchor strip along one edge thereof which is secured to the roof and a flashing member along the other or opposite side of said sheet, with the gravel stop disposed between said fold lines and said anchor strip and said flashing member.

Another feature of the invention is a concealed splice plate to provide for automatic expansion and contraction between the adjoining metal sheets.

In the accompanying drawings,

FIG. 1 is a vertical sectional view drawn to full scale;

FIG. 2 is a broken elevational view on a reduced scale as observed in the direction of arrow 2 of FIG. 1;

FIG. 3 is a broken exploded view on a reduced scale from the showing of FIG. 1;

FIG. 4 is a horizontal sectional view as observed only in the plane of line 4-4 of FIG. 1 and on an enlarged scale.

in FIG. 1 the roof of a building is indicated at which has applied thereto the conventional tarred roofing paper and mastic 11 upon which is applied small particles or gravel 13.

The gravel stop and flashing is made preferably of a non-ferrous metal sheet 15 preferably in lengths of 8' and the sheets are provided with deep cross or transverse corrugations extending transversely of the sheets and are approximately deep and disposed so that there are substantially four corrugations to the inch, i.e., four combined grooves 16 and alternately disposed ridges 17 to the inch. These corrugated sheets provide a very strong and rigid body which will not flex, bend or buckle when installed so that no fastening is required except the portion of metal sheet which is supported by the roof.

The elongated metal sheets 15 are bent along parallel longitudinal fold lines to provide an anchor strip 19 along one side or edge of the sheet and a flashing memher or portion 20 along the other or opposite side of said sheet, and with a gravel stop or flange 21 disposed between said anchor strip and said flashing and between said parallel fold lines. The gravel stop or flange 21 extends from the frontal continuation of the anchor strip 19 in an upward and forward direction at an acute angle, and extending downwardly from the apex of said flange 21 at right angles and in spaced relation thereto is the 3 36 334 Patented Apr. 23, 1963 flashing member 20. The flashing member projects down alongside of the edge of the roof and building and is arranged in spaced relation thereto and requires no at.- tachment between the flashing and the building or roof. In the formation of the flange 2 1 between the anchor strip and flashing the metal sheet is bent with rounded or curved edges so as to eliminate all sharp corners which are injurious to the metal sheet and have a tendency to fracture. This type of rounded or curved bend increases the strength of the flanged gravel stop and also the flashing and gives certain rigidity to the flashing so that it does not require any fastening and eliminates buckling and waviness in the flashing. This is augmented by the cross corrugations which will not be destroyed or flattened in bending the metal sheets to form the flange along the frontal edge of the anchor strip, and in the downward bending of the sheet to form the flashing. With this arrangement or bending the metal will not be fractured as by the customary sharp angle bends given to metal in roofing.

The longitudinal bottom edge 24 of the flashing 20 flares outwardly to provide a spillway for any moisture or rain striking the flashing, and the edge is bent inwardly as at 25 in rear of said flared edge 24 forming a lip to provide a groove or channel 26 between the lip 25 and the flared edge 24.

As indicated in FIGS. 1 and 2, the metal sheets 15 are applied to the roof with anchor strips 19 disposed on the roof and within the roof covering 11 and the anchor strips are held in position by nails 27 applied at suitable intervals throughout the length of the anchor strip sufiiciently to maintain the metal sheets 15 positioned on the roof. This is the sole securing means for the metal sheets to the roof. In FIG. 2 we have shown the metal sheets 15 in an arrangement with respect to each other in accordance with their application to a roof, so that the flashing members 20 will be arranged with respect to each other, i.e., as these metal sheets 15 are substantially 8' in length they will be arranged in end-tosend relation. To provide a seal between the adjoining sheets 15, a concealed splice plate of suitable metal is provided which conforms in configuration to the metal sheets 15 and has an anchor portion 29, an angular flange 30, and a face plate 3-1. The face plate 31 is provided with a flared portion .32 to be received within the groove 26 of the adjoining metal sheets 15 while the flashing members 20 will overlie the face plate 3 1 and the anchor strip 19 will be positioned upon the anchor portion 29.

The splice plate is preferably fltted to an end of one of the metal sheets 15, with the flared portion 32 thereof received in the groove 26 of the metal sheet 15, and with the flashing 15 and anchor strip 19 of the sheet overlying or overlapping approximately one half of the face plate 31 and anchor portion 29 of the splice plates, respectively. The remaining half of the splice plate is next attached to the roof 10 and wall 34 by nails 27, which are driven through the anchor portion 29 and face plate 31, as indicated by dotted lines in FIG. 3. The adjoining metal sheet 15 is now fitted to the secured portion of the splice plate, as previously described, with the adjoining edges of the two sheets arranged in spaced relation to each other, one-eighth of an inch, and the splice plate will be concealed beneath the sheets 15-. The sheets '15 can now be secured to the roof 10 by nails 27 being driven into the roof.

This splice plate is only 6" in length and is intended primarily for establishing an engagement between the adjoining ends of the metal sheets 15 for connecting them together and forming a proper seal against the elements, such as rain. The adjacent edges of the metal sheets '15 are not held in abutting engagement but are separated at least to allow for expansion and contraction due to temperature conditions, so that they can move toward or from each other freely under temperature conditions. After the splice plate has been applied to the roof it is preferred that the entire top surface 29 at least be covered with a plastic cement so as to provide a watertight connection. It is to be noted that this splice plate is always concealed except for the slight spacing of A3" between the adjoining ends of the corrugated metal sheets 15. This plastic cement does not in any way afiect the sheets 15 movement with respect to the plate due to expansion or contraction.

What is claimed is:

1. In a roof having a deck and an overlying waterproof gravel covering, an edge construction comprising a plurality of elongated metal sheets arranged with the ends thereof in spaced end-to-end relation along the edge of said roof, each of said sheets being bent along spaced lines parallel to the longitudinal edges of the sheets to provide a rear anchor strip, said anchor strip being secured to the roof deck and underlying the marginal edge portion of a roof covering, an outwardly and upwardly extending inclined portion to provide a gravel stop portion for retaining the gravel on said roof covering, and a downwardly directed portion extending from the apex of the inclined portion to a line below said roof covering to provide a flashing portion, the lower edge of the flashing portion having an inwardly turned marginal extension said sheets being secured to said roof only at points located in said anchor strips of the sheets and beneath said roof covering, the gravel stop portion and flashing portion of said sheets being disconnected from the roof and movable longitudinally with respect to said roof and with respect to each other to allow for expansion and contraction of said portions, and a splice plate having a cross section corresponding to that of said metal sheets and contacting the inner surfaces thereof, the splice plate being secured to both the top and the outer edge of the roof deck beneath said sheets and across the space between the adjacent ends of the sheets, said splice plate having a projecting lower edge arranged in interfitting engagement with the inwardly turned marginal extensions on the flashing members of said sheets adjacent the ends of said metal sheets.

2. In a roof having a deck and an overlying waterproof gravel covering, an edge construction comprising a plurality of elongated transversely corrugated metal sheets arranged with their ends in spaced end-to-end relation along the edge of said roof, each of said sheets being bent along spaced lines parallel to the longitudinal edges of the sheets to provide a rear anchor strip underlying the marginal edge portion of said roof covering, an upwardly and outwardly inclined portion formed in each sheet and extending longitudinally thereof adjacent said anchor strip to provide a gravel stop portion for retaining the gravel on said roof covering, and a downwardly directed portion extending from the apex of the upwardly and outwardly inclined portion to a line below said anchor strip to provide a flashing portion, said inclined portion and said flashing portion being joined by rounded curved bends therebetween to provide for greater rigidity and strength between these portions, said flashing portion having an inwardly turned extension along the lower edge thereof said sheets being secured to said roof only at points located in said anchor strips of the sheets and beneath said roof covering, the gravel stop portion and flashing portion of said sheets being disconnected from the roof and movable longitudinally with respect to said roof and with respect to each other to allow for expansion and contraction of said portions, a concealed splice plate having a cross section corresponding to that of said metal sheets and contacting the inner surfaces thereof, said splice plate being attached to said roof and underlying the adjacent ends of said sheets, said splice plate having interfitting engagement with the inwardly turned extension adjacent the lower edges of said sheets and extending across the space between the adjacent ends of the sheets, and fastening means extending through said splice plate and into the upper surface and the outer edge of said roof deck and cooperating with the marginal edge of the splice plate and said inwardly turned extension to hold said flashing members in fixed positions relative to said roof.

References Cited in the file of this patent UNITED STATES PATENTS 1,231,711 Cordes July 3, 1917 1,855,022 Kellog Apr. 19, 1932 2,054,049 Cheney Sept. 8, 1936 2,639,679 Finn May 26, 1953 2,734,602 Dawson Feb. 14, 1956 2,857,861 Trostle Oct. 28, 1958 3,012,376 Reddy et al. Dec. 12, 1961 OTHER REFERENCES Sweets Catalogue File (Arch) 1956, sec. 8a/ko, page 26, Design Heating and Air Conditioning Contractor of May 1957, page 31.