The construction sector is changing rapidly, and the roofing industry faces new challenges : environmental (recycling, fire resistance, smoke emission during installation), economic (increase in raw materials, cost of implementation) and marketing (identify levers of differentiation).

Our grids are specially designed to improve the levels of performance and durability of waterproofing membranes by delivering mechanical strength and dimensional stability. Additional performance factors such as tear resistance, fire resistance and perforation resistance are also delivered depending on the membrane technologies used.

In addition to the advantages of the ROTATEX™ and ROTAFLEX™ range in terms of mechanical performance, we have developed a number of special reinforcements to meet visual appearance criteria.

Bituminous waterproofing membrane

Bituminous waterproofing is a historically proven technique. A bituminous waterproofing membrane consists of bitumen and one or more reinforcements. In the case of bituminous roofing, one or two waterproofing layers are applied on top of the thermal insulation. This technique makes it easier to lay the membranes on the building site.

Waterproofing membranes are used on roof terrace, sloping roof or as vapor barrier. For most of these applications however, mechanical strength, dimensional stability and fire resistance are prerequisites. Thanks to our complex grids with films and nonwovens, these basic prerequisites are indeed met, and are complemented by additional properties such as perforation resistance and low permeability to water vapor.

Single Ply waterproofing membranes

Single-ply waterproofing membranes are used on new large, flat or slightly sloped roofs. They are unusual in that they are put down as one single layer.

Single-ply waterproofing membranes are made of different materials (PVC, TPO, EPDM, etc.). Each matrix requires a dedicated reinforcement that brings elongation and tear resistance. CHOMARAT grids deliver these properties, and fire resistance is delivered by combining grids with a nonwoven.


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