GB2148350A

GB2148350A - Lapped roof sheeting

Info

Publication number: GB2148350A
Application number: GB08426354A
Authority: GB
Inventors: Yves Suzor
Original assignee: Everitube SA
Current assignee: Everite SA
Priority date: 1983-10-19
Filing date: 1984-10-18
Publication date: 1985-05-30
Also published as: FR2553811B1; NL8403140A; DE3438479A1; GB2148350B; ES291630U; CH661958A5; LU85597A1; IT8468030A1; IT8468030A0; BR8405222A; ES291630Y; DE3438479C2; MX160714A; GB8426354D0; BE900849A; FR2553811A1; IT8453930V0; IT1179774B

Abstract

Corrugated strip L for supporting successive rows of corrugated roofing sheets 5-8 with upper sheets 7,8 overlapping lower sheets 5,6 and the sheets of the same horizontal row 7,8 and 5,6 overlapping each other at their lateral ends has an undulation of the same modulus as that of the roofing sheets 5-8, has the same thickness as the latter and is placed on each upper end of a lower sheet 5-6, in order to serve as a support for the lower end of a corrugated sheet of the upper row 7,8. The strips are narrower than the associated roofing sheets to permit even overlap of the latter at lateral edges - Fig. 3. <IMAGE>

Description

SPECIFICATION Device for laying corrugated roofing sheets The present invention relates to a device for laying corrugated sheets for roofing. It relates in particular, but not exclusively, to the assembly of corrugated sheets, whether or not sinusoidal, in particular of fibro-cement.

In a known method of laying sheets of this type on the timbers of a framework, for reasons of a mechanical nature (seating of the sheets, continuity of the roofing etc....) and in order to obtain a good seal, it is necessary that the sheets overlap partially, both in the transverse direction and in the longitudinal direction of the roofing. In the region where four adjacent sheets overlap, this overlapping means that four thicknesses of sheet are stacked, thus creating overhangs which are undesirable and prejudicial to the seal, above all when this thickness is substantial.

In order to attempt to remedy this problem, it has been proposed to cut two diagonally opposed corners of all the standard sheets and one or no corner for the edge sheets, the diagonal in question being determined by the direction in which these sheets are laid, itself determined as a function of the direction of the prevailing rain-bearing winds. In the area where the sheets overlap, this cut-out makes it possible to have three thicknesses instead of four, the two intermediate thicknesses being reduced to only one by cutting out the corners and placing the cut lines in contact.

This operation is normally carried out on site or sometimes in the factory on sheets of dry material ready for laying. It thus necessitates preliminary operations prior to laying of the sheets and certain tools (templates and cutting tools). More particularly, it is necessary to prepare the sheets by measuring precisely the dimensions to be respected according to the chosen overlap, which may vary itself from 140 to 300, for example, depending on the slope of the roof and the slope lengths. If the dimensions of the corners are not respected, there is a danger of creating passages for water or blockages of the sheets, depending on whether there are gaps or overlaps between the sheets. Finally, as soon as the corners are cut, no further latitude of play exists between the sheets.

The present invention remedies these drawbacks. It relates to a device for laying corrugated roofing sheets, characterised in that it is constituted by a strip of general rectangular shape when flat, comprising an undulation in the longitudinal direction, of the same modulus as that of the roofing sheets, said strip being placed on each corrugated upper end of the sheet and serving as a support for the lower corrugated end of the adjacent roofing sheet in the transverse direction.

By virtue of this device, it is no longer necessary to proceed with cutting-out on site or in the factory of sheets made from fibro-cement or other material. The device according to the invention ensures the continuity of the undulation and the overlapping of four sheets is made possible without creating an overhang.

Further features and advantages will become apparent from the ensuring description and with reference to the accompanying drawings, given solely as non-limiting examples, in which: Figure 1 is a perspective view of the device according to the invention; Figure 2 is a perspective view of an assembly of corrugated sheets comprising said device; Figure 3 is a sectional view on line Ill-Ill of Figure 2, to an enlarged scale and limited to the overlapping region of four adjacent sheets.

As shown in Figure 1, the device according to the invention comprises a strip L of general rectangular shape when projected on a plane, whereof the longitudinal side 1 is much larger than the transverse side 2. The strip L, whether or not of constant thickness, comprises an undulation in the longitudinal direction and its rectilinear transverse ends are determined so that the strip L may be used in a symmetrical manner by rotation in its plane, so that if one 3 of the ends is situated at the level of the peak of an undulation, the other end 4 will be located in the vicinity of a trough of undulation. It is also preferable that in the longitudinal direction and towards the outside, each end slightly exceeds the peak of the undulation for one end and the trough of the undulation for the other.The undulation of the strip L is of the same modulus as that of the roofing sheets of which it facilitates the laying. It is preferably made from a material of the same nature as the latter, namely fibro-cement, or any other non-flowing material.

Figures 2 and 3 show a partial assembly diagram of roofing sheets according to which corrugated sheet 5 is placed on timbers (not shown) at the lower edge and at the corner of the roofing to be produced. An adjacent sheet 6 is then laid, which partly overlaps the rectilinear longitudinal end of the sheet 5, from the side where the prevailing rain-bearing winds blow, the direction of which is represented by the arrow D, laying being carried out from left to right. Before laying the upper row, a strip L is placed on each upper corrugated end of a sheet 5, 6 already laid, whilst ensuring that the undulation of the latter coincides with that of the underlying sheet and that the corrugated edges are superimposed, nevertheless on condition of preserving the so-called "drop of water" spacing.In addition, since the length of each strip L is slightly less than that of the underlying sheet, the result is that a strip Ln overlapping a sheet n is situated in the extension of the sheet n21 adjacent to the sheet n in the longitudinal direction, thus ensuring continuity of the upper side as shown in Figure 3, since at the maximum the transverse end 4 may come into contact with the edge of the left-hand transverse end of the sheet 6 and at this point it has the same thickness as the latter.

It is then possible to position the sheets of the upper row by laying the first 7, on the strip L with their respective undulations corresponding. In order to preserve the seal, a sheet 7 overlaps the upper part of the lower sheet 5 as well as the lefthand upper corner of the adjacent sheet 6. The width of the small sheet L is thus always less than the overlap of the upper transverse sheet. It is then possible to lay an adjacent sheet 8, by making it overlap the trough of the terminal longitudinal undulation, which sheet 8 will thus be supported both on the sheet 7 and on the terminal strip placed on the lower sheet 6 in the transverse direction. In the region of overlap of the four adjacent sheets 5, 6, 7, 8, four superimposed thicknesses are thus provided without drawbacks.

In order to ensure good seating of the upper sheet, the width of each strip is for example approximately 50mm and, in the case of fibro-cement sheets, a width of 100mm may be recommended in order that the strip has adequate strength.

In order to prevent any possible sliding of the strip on the sheet which supports it, it is possible to drill this strip in the factory so that it is kept in place by fastenings of the sheets which pass through it through openings created in this way.

As a variation, a strip may be stuck in the factory to each roofing sheet. According to another variation which is not illustrated, a strip may be sub-divided into two longitudinal parts, one being stuck to the top of the sheet along the upper corrugated edge and the other being stuck along the lower corrugated edge but on the underside. At the time of assembly, each longitudinal half-strip will be located beside the other, in the transverse direction, and will provide the necessary supports.

It is also the purpose of the strips according to the invention to improve the water-tightness of the roofing, since they prevent a capillary action, if, in addition, they are of variable thickness or are compressible, or even provided with a flexible gasket, a more complete seal is obtained.

From the aesthetic point of view, emphasis is placed on transverse overlaps, thus recalling the traditional roofing of individual houses.

Since the rectilinear ends of the strip come into contact with the edge of adjacent overlapping sheets, they ensure clamping of the latter and prevent any deformation of the terminal undulation.

This is particularly advantageous in the special case of sheets comprising considerable ribbing where the peaks of the undulation are connected by rectilinear portions.

Claims

1. Device for laying successive rows of corrugated roofing sheets with upper sheets overlapping lower sheets and the sheets of the same horizontal row overlapping each other at their alteral ends, the device comprising a strip of generally rectangular shape when flat and corrugated in the longitudinal direction, wherein said strip comprises an undulation of the same modulus as that of the roofing sheets, has the same thickness as the latter and is placed on each upper end of a lower sheet, in order to serve as a support for the lower end of a corrugated sheet of the upper row.

2. Device according to Claim 1, wherein the length of the strip is less than that of the sheet which supports it.

3. Device according to Claim 2, wherein one of the rectilinear ends of the strip is situated at the level of a peak of an undulation and the other in the vicinity of a trough of an undulation.

4. Device according to Claim 1 or 2, wherein the width of the strip is always less than the overlap produced by the upper transverse sheet.

5. Device according to Claim 1 or 2, wherein the rectilinear ends of the strips come into contact with the edge of adjacent overlapping sheets.

6. Device according to Claim 1 or 2, wherein the strip is stuck in the factory to each roofing sheet.

7. Device according to Claim 1 or 2, wherein the strip is sub-divided into two longitudinal part, one being stuck to the top of a sheet, along the upper corrugated edge and the other being stuck along the lower corrugated edge, but on the underside.

8. Device for laying successive rows of corrugated roofing sheets substantially as hereinbefore described with reference to the accompanying drawings.