FR2656889A1 - METHOD FOR FIXING A BITUMEN - BASED SEAL SHEET, AND SEALING SHEET IMPLEMENTING THE SAME. - Google Patents

Abstract

Fixing method characterised in that is consists, either during the laying of the waterproof sheet onto the support to be covered or during the manufacture of the said sheet, in installing on the overlap edging (1) of the waterproof sheet, a short distance from its border, a metal strip (2) of small thickness comprising transverse grooves (3) and drilled holes (4) disposed at regular intervals over its entire length and then in fixing the said waterproof sheet onto the support, which is to be covered by the agency of the said metal strip (2), by means of corresponding screws or rivets.

Description

The subject of the present invention is a novel process for fixing

  sealing sheets based on bitumen, as well as the new sealing sheets used in this process. Among the systems known to date for waterproofing roofs, one of the most commonly used is to use a bituminous coating mechanically fixed on the support to be protected by means of screws or

  rivets evenly spaced along its lap liner.

  Such a system is however not without inconvenience, the mechanical fixing of the coating causing risks of perforation by the screws or rivets implemented, as a result of the settlement of the support and / or movements of the building structure. In order to remedy this disadvantage, it has been proposed to arrange on the bitumen sheet during installation, at the locations of the screws or rivets used for fixing it, fastening aids such as washers or metal plates. However, this method has the disadvantage of to create a heterogeneity between the flexible bitumen sheet and the rigid fixing means, resulting in the possibility of formation of folds between two consecutive fastenings, with the risk being

tearing of the leaf.

  The present invention aims to overcome these various disadvantages of known fastening systems by providing a method of fixing a bitumen-based sealing sheet which avoids any risk of perforation or tearing of

said sheet.

  The present invention thus has as its first object a method of fixing a bitumen-based sealing sheet, this process being essentially characterized in that it consists in providing the covering strip with said sealing sheet, at short distance from its edge, a thin metal strip having transverse grooves and holes arranged at regular intervals along its entire length for the

  passage of the screws or rivets used for fixing the sheet.

  The implementation of such a metal strip makes it possible to create a homogeneity between the sealing sheet and its fastening means, the forces which usually solicit the sealing coatings being transmitted by said strip

  metal from one attachment to another.

  The method according to the invention thus makes it possible, not only to avoid the risks of perforation of the sheet in the vicinity of its mechanical attachment points, but also the risk of tearing as a result of the formation of folds between the fasteners, the metal strip ensuring a solution of continuity between the fasteners and its transverse grooves allowing it to match the deformations of the sealing sheet, whether these deformations are due to mechanical stresses or to

thermal phenomena.

  According to the invention, the metal strip used in the process which is the subject is secured to the sealing sheet by heat-sealing during its

manufacturing.

  The metal strip used in the process according to the invention must have sufficient strength and a high resistance to bending, to meet the requirement to be robust in low thickness of

  in order to allow the winding of the sealing sheets.

  For all these reasons, it is advantageously made of a stainless steel strip whose thickness is between 5/100 mm and 16/100 mm and the width between 2 and 3 cm, comprising over its entire length transverse splines 1 to 1.5 cm apart, the width of which is between 2 and 3 cm and the depth between 0.5 and 1 mm, and furthermore having bores arranged at regular intervals,

for example every 5 cms.

  The metal strip used in the process according to the invention is arranged on the overlapping strip of the sealing sheet, preferably about 2 cm from its edge,

  so as to leave on the sheet a weld strip.

  The method according to the invention offers the advantage of being of great ease of implementation, because of the holes of which the metal strip is provided, and of being able to give rise to laying errors because said strip metallic made

  integral part of the sealing sheet.

  It also offers the advantage of allowing economy of recovery compared to traditional methods, the metal fastening strip allowing the implementation of a narrower overlap (of the order of 6 cm), washers or platelets implemented in traditional processes entailing the need for recovery that overflows them enough

  widely and whose width is generally of the order of 7 cm.

  The method of the invention is applicable to all bitumen-based sealing sheets, and is particularly suitable for monolayer coatings, due to economy.

recovery that it authorizes.

  The subject of the present invention is also the sealing sheets of a new type used in the process according to the invention, and presenting all the

  characteristics outlined above.

  The present invention will be better understood when reading

  of the description which follows, made with reference to the appended drawing,

  which represents a non-limiting embodiment thereof.

  In the accompanying drawings: FIG. 1 represents a perspective view of the overlapping strip of a sealing sheet according to the invention. FIG. 2 represents a sectional view of the same

  sheet, along the line XX 'of FIG.

  Referring first to FIG. 1, it can be seen that the cover strip 1 of a sealing sheet according to the invention comprises, at 2 cm from its edge, a 2 cm wide metal strip 2 provided with grooves 3, regularly distributed over its entire length, spaced about 1.5 cm from each other, and holes 4 formed along its length, at regular intervals. Referring next to FIG. 2, it can be seen that the grooves 3 formed in the metal strip 2 penetrate into the cover strip 1, to which the metal strip 2 has been secured by hot self-welding during the manufacture of

the sealing sheet.

  The grooves 3 of the metal strip 2 promote its attachment to the overlap 1 of the sealing sheet by increasing the contact area between the two, and secondly, they allow the strip 2 to match the deformations of sheet, thereby removing the risks of

tearing of the latter.

  It goes without saying that the present invention can not be

  limited to the foregoing description of one of its modes of

  realization, likely to undergo a number of

  modifications without departing from the scope of the invention.

Claims (6)

  1) A method for fixing a bitumen-based sealing sheet, characterized in that it consists in joining to the overlapping strip (1) of said sheet, a short distance from its edge, a metal strip (2) of small thickness having transverse grooves (3) and holes (4) arranged at regular intervals along its length for the passage of   screws or rivets used for fixing it on the support to be protected.   2) Method according to claim 1, characterized in that the metal strip (2) is secured to the cover strip (1) of the sealing foil by heat-sealing during the manufacture of the latter.   3) Asphalt-based waterproofing sheet intended to be   implemented in the process which is the subject of the claims   1 and 2, characterized in that it comprises on its cover strip (1), a short distance from its edge, a metal strip (2) of small thickness having transverse grooves (3) and holes (4) arranged at regular intervals along its entire length for the passage of screws or rivets   used to fix it on the support.   4) sealing sheet according to claim 3, characterized in that the metal strip (2) is made of a metal having a good mechanical strength and a high flexural strength.   Sealing sheet according to claim 3 or claim 4, characterized in that the metal strip (2) is a stainless steel strip of thickness between 5/100 mm and   16/100 mm and width between 2 and 3 cm.   6) Sealing sheet according to any one of   Claims 3 to 5, characterized in that the flutes   transverse sections (3) are arranged at regular intervals along the entire length of the metal strip (2), being at a distance from one another others from 1 to 1.5 cm.   7) Sealing sheet according to any one of   Claims 3 to 6, characterized in that the flutes   transverse sections (3) of the metal strip (2) have a width of between 2 and 3 cm and a depth of between 0.5 and 1 mm.