GB2413567A - Roof tile designed for variable overlap - Google Patents

Abstract

A tile has a projection 14 and a projection contact region (the upper surface of the tile beneath) intended to keep out rainwater, the arrangement being such that variable overlap of the tile along the slope of the roof is possible. This enables a tiler to vary the spacing between battens and avoid the need to cut the final row of tiles along the ridge line, as the projection 14 may rest anywhere between the ridges 123 and the bottom of the underlying tile. Sidelaps 51 - 54 are provided; the tiles may be of clay.

Description

The present invention relates to roof tiles for forming pitched roof

coverings.

In this specification, references to a 'side' direction refer to the direction which would beacross the pitch of a roof when the tiles are laid corrrectly, and references to an 'up/down' direction refer to the direction which would be up and down the pitch of such a roof.

Roof tiles may be single or double overlap tiles. Double overlap tiles abut side by side on a roof and rely on a tile below to prevent water that enters between them passing through the roof. Single overlap tiles interlock side by side such that water cannot enter between them.

Single overlap tiles normally have interlocking ribs down a side edge, commonly known as side interlocks or sidelocks, so that they can interlock with tiles to their sides. Furthermore, some tiles have ribs across a top edge, known as head interlocks or hcadlocks. These allow interlocking of tiles one above the other on a roof, i.e. interlocking of adjacent tiles with different spacings in an up/down direction.

An example of a headlock tile 4 is shown in Fig. lb. It can be seen that a ribs 4l, 42 protruding from the top face 43 of a dower tile 4 are interleaved between two ribs 44 and 45 protruding from the bottom face 46 of an upper tile 4. Thus the tiles are 'interlocked'. In this case, the interlocking restricts movement of the tiles relative to each other in a direction 'A', i.e. the up/down direction of the roof. Furthermore, the ribs act as barriers to 'weather', in particular to water entering between the two tiles.

The general rule is that clay tiles are made with both sidelocks and headlocks (double interlocking tiles), whereas concrete tiles are made only with sidelocks (single interlocking tiles). The difference has arisen due to two different methods of tile construction. Clay tiles are press formed, and can be designed to assume any shape. Concrete tiles are formed by extrusion, so can only be made with raised ribs in the direction of the extrusion, i.e. in one direction only.

(oncret:e tiles are much easier than clay tiles to "set out" on a roof, since one tile is sbsLantially slidable over another in the up/down direction. l'he tiles are slidable because there are no Deadlocks to obstruct up/down movement. The advantage of the tiles being ]O slidable over one another in this manner is that a roofer can more easily calculate the number of courses of tiles required to reach from the lower edge of a roof to the top ridge of that roof.

In contrast, double interlocking tiles, such as clay tiles, can not significantly slide in an up/down direction over one another, due to the headlock. Thus, when setting out a roof, it may be impossible for the roofer to finish up with a whole tile at the top ridge.

In such a case, the roofer has to cut each tile along the whole length of the top ridge to fit properly. This is time consuming, expensive and demands considerable skill.

Furthermore, it can cause roofing contractors to shy away from using double interlocking tiles in favour of single interlocking tiles, such as concrete tiles.

At its most genera], the present invention proposes a tile having a projection to impede water entry between the tile and an adjacent tile, but permit variable overlap of tides. In particular the present invention relates to roof tiles for pitched roofs. Preferably the tile is a clay tile, although it is envisaged that the tile could be manufactured from a variety of common roof tile materials known by the skilled person.

According to a first aspect of the invention, there is provided a tile having a projection and a projection contact region, the projection being for, when the tile overlaps a similar or identical adjacent tile, contacting the projection contact region of the adjacent tile and inhibiting water entering therebetween, wherein the shape of the projection, and the shape of the projection contact region, permits variable overlap of the tiles.

The projection may be a rib, the projection preferably being at the bottom face of the tile (the surface of the tile that faces towards the ground when set on a roof), whilst the tile projection contact region is at the top face of the tile. It is understood that the positions o these two features could be reversed to serve the same purpose, i.e. the projection may be at the top face of the tile, with the projection contact region at the loot-tom face of the tile.

The tile may have a nail hole at one end, such that the tile can be fixed by a nail to a roof batten.

Preferably, the profile of the projection should conform to the profile of the projection contact surface so that good water tightness can be achieved. It is understood that a plurality of projections could be placed side by side on the tile to further increase water tightness.

Preferably the projection contact region is a smooth outer surface of the tile with no obstructions such as recesses and/or protuberances over its full extent. This provides for a continuous degree of overlap within the limits of the variable overlap and allows tiles to be slid easily into position. It is understood, however, that the projection contact region could have protuberances or recesses that would provide for discrete degrocs of overlap within the full amount of the variable overlap, whilst allowing the tile to rest truly ire position. In such a scenario the tile may have to be placed, rather than slid, into a desirable position.

Preferably the amount of variable overlap permitted is Close to tie full length of the tile. However the minimum amount of variable overlap permitted may be up to l/8, 1/4, l/3, l/2, 3/4, or 4/5 of the length, or the width, of the tile.

Preferably, the variable overlap is permitted in the up/down direction of the roof, i.e. along a line running between the lower edge of the roof and the upper ridge of the root. In this case it is preferable that the projection contact region extends in an up/down direction, perhaps from adjacent a nail hole at the top end of the tile, to the bottom end of the tile.

Furthermore, the tile may comprise a side protrusion and a side recess and/or side abutment, the side protrusion being for contacting the side recess and/or side abutment of a similar or identical tile located to its side on a roof, thus side-interlocking the two tiles and restricting sideways movement of the tiles with respect to each other. The side protrusion and the side abutments are both preferably ribs. Furthermore the side prot-rusior is preferably at one side of the lop face of the tile with the side abutment and/or side recess at the opposite side of the bottom face of the tile. It is understood tilt the positions of these two features could be reversed to serve the same purpose, i.e. the side protrusion may be at one side of the bottom face of the tile with the side abutment, and/or side recess, at the opposite side of the top face of the tile.

The shape of the side protrusion and the side recess or abutment may permit up/down sliding of side-interlocked tiles with respect to each other. To allow this, the side protrusion may be a rib of uniform crosssectional area, and the side recess may be a channel of corresponding shape, preferably having at least one open end.

Preferably the tile is a clay tile made by press-forming.

Press-forming allows a tile with any number of surface formations to be produced. In the present invention it may be the omission of certain surface features traditionally included in e.g. a press-formed clay tile, such as a deadlock, that pcrrnits the variable -'vcrlap.

The present invention can apply to pantiles, and may also apply to other styles of roof Liles, known by a person skilled in the art.

Embodiments of the invention will now be described with references to the accompanying drawings, in which: Fig. ]a shows a side view of overlapping tiles according Lo a first embodiment of the present invention; Fig. lb shows a prior art tile that permits no variable overlap; Fig. 2 shows an oblique top view of a tile according to the first embodiment; Fig. 3 shows a top view of the first embodiment; Fig. 4 shows a bottom view of the first embodiment; Fig. 5 shows an oblique bottom view of the first embodiment; Figs. 6 and 7 show an oblique view of a plurality of overlapping and interlocking tiles of the first embodiment.

Fig. la shows two overlapping tiles 1 located on roof battens 2. The tiles 1 arc essentially hooked on roof battens 2 via nibs 11 located at the top end]2 of the bottom face 13 of each tile 1. The tiles 1 have a projection 14 located at the bot:t-om end 15 of the top face 16 of the tiles. Fig. la shows the projection 14 of the upper tile in contact with a projection contact region l7 of the lower tile. This contact forms a barrier to water entering between the two tiles 1. fiche projection contact region 17 is a smooth surface of a portion of the top face 16 of tile 1 extending from adjacent the top end 12 of the tide 1 to the bottom end of the tile 1.

Due to the shape of the projection 14 and the nature of the projection contact region 17, a variable degree of overlap of the tiles 1 can be accommodated with the tiles still resting truly. Therefore, when a roofer sets out the battens 2, the roofer has considerable leeway when choosing an appropriate distance ('gauge') between the roofing battens 2. In the present example, the tiles 1 could overlap by up to approximately 4/5 of their overall length if the battens 2 were placed closer together accordingly.

Contrastingly, for the overlapping prior art tiles

shown in Fig. lb, variable overlap is reslrictc-l as described above.

Figs. 2 and 3 show top views of the tile 1 according to the present invention. This tile is a clay panti]e.

Figs. 2 and 3 show the projection 14 is a rib extending along the width of the bottom end 15 of the tile 1. At l() the top end 12 of the top face 16 of the tile 1 is a depression 121 that forms, inter alla, one or more nib(s) 11, for hooking the tile 1 on roof battens, and also for assisting the stacking of a plurality of tiles 1.

Furthermore, the depression 121 may serve as a trap for any water that enters between the projection 14 and projection contact region 17.

Within the depression 121 is a nail hole 122. The nail hole 122 permits a nail to be driven therethrough such that the tile 1 can be nailed to a roof batten if required. The projection contact region 17 extends between a plurality of ribs 123, and the bottom end 15 of the top surface 16 of the tile 1. The plurality of ribs 123 define a minimum overlap for the tile 1 and similar or identical tile overlapping from above. For pantilc->s, the minimum ciegree of overlap is usually 75 mm.

The tile 1 comprises a rib-shaped side protrusion 51 at a S side edge 52 of the top surface 16 of the tile 1. The tile 1 further comprises a ribshaped side abutment a side edge 55 of the bottom surface 13 of the tile 1. A side recess 53 is defined between the side abutment 54 an edge of the projection 14.

The side protrusion 51 is for contacting the side abutment 54, and dying in the recess 53, of a similar or identical tile located to its side when it is set out on a on a roof, thus side-interlocking the two tiles and restricting sideways movement of the tiles with respect to each other.

Figs. 4 and 5 show bottom views of the tile 1. The side abutment 54 can be seen more clearly as a rib running along the side edge 55 of the bottom surface 13 of the tile 1, between the top end 12 and bottom end 15 of the tile 1. The side recess 53 is essentially a channel running alongside the rib. In this embodiment the channel has open ends. This allows two or more side interlocked tiles 1 to slide in an up/down direction with respect to each other.

Figs. 6 and 7 each show three tiles la, lb, lo, according to the present inventior-, interlocked and overla-'pinc: ire a manner appropriate to a roof covering.

Fig 6. shows the projection 14 of the upper tile la contacting the projection contact regior- ]/ of the tile lO lb below. It can be seen that the profile of the projection 14 substantially corresponds to the profile of the projection contact region 17, leaving little or no gap therebetween and thus giving good water tightness.

In this example the projection 14 of the upper tile la is contacting a portion of the projection contact region 17 of the lower tile lb adjacent the ribs 123, and is thus overlapping the lower tile lb by approximately the minimum amount permissible for this tile.

2() Fig. 7 shows the same arrangement of tiles la, lb, lc as in Fig. 6, but with the upper tile la overlapping the lower tile lb in the up/down direction by a greater amount. Essentially, the upper tile has been moved, by sliding, placing or otherwise, from its position shown in Fig. 6 to the position shown in Fig. 7. This is made possible by the smooth nature of the projection contact region -17 presenting rho obstruction to variable positioning of the project-ion l/ of the upper tile la between the ribs]23 and the bottom end of the tile.

Figs. 6 and 7 snow two tiles lb, lc side-interlocked.

The side protrusion 5] of the right hand tile lo is contacting the side abutment 54, and lying in the recess l() 53, of the left hand tile lb, hence restricting sideways movement of the tiles 1b, lc with respect to each other.

This type of interlocking forms a good seal, preventing water entering between the tiles lb, lo.

It should be noted that once correctly portioned, by sliding, placing, interlocking or otherwise, tiles la, lb, 1c according to the present invention may each be fixed to roof battens via one or more nail(s) driven through one or more nail hole(s) 122.

A person skilled in the art will appreciate that the ideas expressed in the embodiment can be achieved in ways other than those specifically described; the scope of the present invention Is not intended to be limited by the

examples.

Claims (10)

1. Claims: 1. A tile having a projection and a projection contact region, the

   projection being for, when the tile overlaps a similar or identical adjacent tile, contacting the projection contact region of the adjacent tile and inhibiting water entering therebetween, wherein the shape of the projection, and the shape of the projection contact region, permits variable overlap of the tiles.
2. 2. The tile according to claim 1, wherein the amount of variable overlap is up to 1/8, /5, i/4, i/2, or 3/ of the IS length of the tile.
3. 3. The tile according to any one of the preceding claims, wherein the profile of the projection corresponds to the profile of the projection contact region.
4. 4. The tile according to any one of the preceding claims, wherein the projection contact region is a smooth surface of the tile.
5. A. The tile according to any one of claims 1 or 4, whcreir- tile tile is a roof tide.
6. 6. The tile according to Glaim 5, wherein the S projection is on t-hc bottom face of the tile, and the projection contact region is on the top face of the tile.
7. 7. The File according to claim 6, wherein the adjacent tiles are tiles one above the other on a pitched roof, and the variable overlap is in an up/down direction.
8. 8. The tile according to claim 7, further comprising a side protrusion and a side recess and/or side abutment, the side protrusion being for interlocking with the side 1S recess and/or side abutment of a similar or identical tile at its side.
9. 9. The tile according to claim 8, wherein the interlocking does not preclude substantial sliding of the tile with respect to the tile at its side in an up/down direction.
10. 10. The tile according to a one of the preceding claims, wherein the tile is a clay tile.

    tile as herein described with reference to, and as illustrated On, I ins. 1a anci l'lcs. ,? to 1.