WO1982003420A1

WO1982003420A1 - Improvements to metal roofing tiles

Info

Publication number: WO1982003420A1
Application number: PCT/AU1982/000049
Authority: WO
Inventors: Tiles Pty Ltd Stoddart; Pty Ltd Carfoots
Original assignee: Stoddart William Alexander
Priority date: 1981-04-03
Filing date: 1982-04-05
Publication date: 1982-10-14
Also published as: IT8212495A0; FR2503222A1; IT1157680B

Abstract

A metal roofing tile having a main body portion and opposite transversely corrugated side edge portions so that one tile may be overlapped with another tile with respective opposite side edge portions mating. A valley in the overlapping edge portion is shallower than a corresponding valley in the overlapped edge portion so that when the tiles are assembled the respective valleys define a water course therebetween for draining water which has seeped under the overlapped edge portions.

Description

"IMPROVEME NTS TO METAL ROOFI NG TILES"

THIS INVENTION relates to improvements to metal roofing tiles. In recent years the usage of light-weight metal roofing tiles has increased to the extent that such tiles are widely accepted for roofing. Generally each tile is shaped to simulate a plurality of conventional tiles so that when the roof is completely covered with such tiles the roof has a conventional tiled appearance.

Generally such light-weight metal tiles are provided with very effective overlapping joints along their longitudinal edges, however the overlapping end joints are generally formed between respective corrugated end portions and it has been found that in rain and high wind conditions the end joints are prone to leakage.

The present invention has as its object the provision of means for such tiles whereby such leakages are prevented by providing a water course intermediate the overlapping ends of respective tiles arranged to direct the water which may enter between the tiles onto a lower tile. With the above and other objects in view, this invention resides broadly in a roofing tile for overlapped layup in a roof, said roofing tile including a main body portion and opposite side edge portions, one edge portion of one said tile being adapted to be overlapped over the opposite edge portion of another said tile and be in substantially mating relationship therewith and characterised in that said edge portions when in overlapped relationship define therebetween substantially closed passage means extending transversely of said tiles, said passage means defining a water course whereby to drain water seeping between said overlapped edge portions. In order that the invention may be more readily understood and put into practical effect, reference will now be made to the accompanying drawings which illustrate a prefereed embodiment of the invention and wherein:- Fig. 1 is a perspective view of a typical tile made in accordance with the present invention; Figs. 2 and 3 illustrate the operational disposition of the modified end joint made in accordance with the present invention;

Pig. 4 is an enlarged perspective view showing the drainage protrusion of the tile illustrated in Fig. 1; and Fig. 5 is a plan view of the drainage protrusion of the tile illustrated in Fig. 4. As shown in Fig. 1, the tile 10 according to the present invention is in substantially the same form as a conventional light-weight metal tile shaped to simulate a bank of edge to edge overlapping tiles. The tile 10 includes a main body portion 11 having an upstanding web portion 12 along its upper edge, and a downwardly depending web portion 13 along its lower edge adapted in use to be engaged over the upstanding web portion 12 of a lower adjacent tile.

As shown, the opposite end portions of tile 10 are corrugated at 14 and 15 so that the valleys and ridges defined by the corrugations of one end portion 14 of one tile overlap and nest snugly within the corresponding valleys and ridges at the opposite end portion 15 of an adjacent tile so that the tiles are accurately located in their end to end disposition and so as to provide a continuous appearance and a waterproof joint between the tiles. In the known tiles the respective corrugated end portions 14 and 15 are complimentary so that one end portion nests closely within the other. In this arrangement, however, water can penetrate between the joined tiles either as a result αf high wind or capillary action between the closely spaced overlapping end portions of respective tiles.

In the present invention, one end portion 14 of the tile 10 is modified as shown in the drawings. In particular, and as more clearly illustrated in Fig. 2, the end portion 14 of the tile 10 has different valley and ridge angles than those of the opposite end portion 15. Therefore, when the end portion 14 of one tile 10 is overlapped with opposite end portion 15 of another tile 10' the outermost depending flange 16 of the edge portion 14 is disposed at an acute angle to a panel portion 17 of the tile 10' so that the free edge

18 of the flange 16 engages thereagainst in line contact therewith.

It will also be seen that the outermost valley

19 of the overlapping tile 10 is shallower than the innermost valley 20 of the overlapped tile 10'.

Preferably and prior to deformation the walls of the valley 19 depend downwardly at 15° to the horizontal whilst the walls of the valley 20 depend downwardly at 23° to the horizontal. Furthermore the outermost flange 16 in its undeformed state is preferably disposed at 45° to the horizontal whereas the outermost flange at the opposite end of the tile is disposed at 30° to the horizontal. Thus, when the overlapped edge portion 14 is pulled down firmly into its operational position by fasteners, bending effort will be applied to the outermost flange 16 forcing the free edge 18 of the overlapping tile 10 into contact with the panel portion 17 of the tile 10' to improve sealing and to leave a water course 21 between the aligned valleys 19 and 20 respectively as shown in Fig. 3.

It will also be seen from Fig. 3 that the outermost ridges and valleys 22 of the tile 10' nestingly engage with the innermost ridges and valleys 23 of the tile 10 so as to prevent water ingress beyond the water course 21 and beneath the tile 10. Thus due to the abutting engagement between the free edge 18 and the panel portion 17, it will be difficult for water to penetrate beyond the edge 18 and in the event that water does penetrate beyond the free edge it passes into the water course 20 and streams downwardly to the nose of the tile.

At the junction between the outermost valley 19 and the nose of the tile the lower web portion 13 is deformed outwardly to define a protrusion 24 which is more clearly illustrated in Figs. 4 and 5. The outward protrusion 24 defines a passage 25 therebehind which communicates with the water course 21 in the lower tile so that water does not dam up and so that water may be directed from the water course 21 to the tile therebeneath. Furthermore the passage 25 is large enough to allow ingress of air so that flow through the water course 21 is not retarded.

The tile of the present invention may be manufactured by any suitable means such as by stamping out a metal sheet and may be provided with a decorative surface if required and the drainage protrusion 24 may be formed by any known metal deformation process.

The invention has been illustrated above in respect of a particular tile but of course it can be applied to all similar tiles and all such modifications and variations thereto as would be apparent to persons skilled in the art are deemed to fall within the broad scope and ambit of the invention as defined by the appended claims.

Claims

1. A roofing tile for overlapped layup in a roof, said roofing tile including a main body portion and opposite side edge portions, one edge portion of one said tile being adapted to be overlapped over the opposite edge portion of another said tile and be in substantially mating relationship therewith and characterised in that said edge portions when in overlapped relationship define therebetween substantially closed passage means extending transversely of said tiles, said passage means defining a water course whereby to drain water seeping between said overlapped edge portions.

2. A roofing tile according to Claim 1, wherein said edge portions are corrugated to define at least one transversely extending valley and wherein the valley of said one edge portion is shallower than the valley of said opposite edge portion whereby to define said passage means therebetween.

3. A roofing tile according to Claim 2, wherein said one edge portion includes a n outermost transversely extending and downwardly depending flange and whereby said flange, when said edge portions are overlapped, is disposed at an acute angle to a panel portion of said other tile to be in line contact therewith.

4. A roofing tile according to Claim 3, wherein said one edge portion includes a further said valley disposed inwardly of said at least one valley and wherein said opposite edge portion includes an outermost valley complimentary to said further valley of said one edge portion whereby to be engaged therewith to prevent water seeping from said water course to the underneath of said one tile.

5. A roofing tile according to Claims 2, 3 or 4 and including a downwardly depending longitudinally extending web at its forward end, said web being deformed outwardly adjacent said one valley of said one edge portion to define a downwardly depending drain passage therebehind whereby water flowing down said water course passes into said drain passage to be directed to the lower overlapped said tile.

6. A roofing tile according to Claims 2, 3 or 4, wherein the walls of said one valley of said one edge portion are disposed at approximately 15° to the horizontal and wherein the walls of said one valley of said opposite edge portion are disposed at approximately 23° to the horizontal.

7. A roofing tile according to any one of the preceding claims stamped from metal sheeting.