Concrete roofs can provide a relatively maintenance free roofing system that can withstand the most exacting weather conditions nature has to offer. The waterproofing of concrete roofs can result in dry buildings in excess of 30 years if done correctly. The typical applications of a torch on membrane on concrete roofs are common place in South Africa.

Types of Concrete Roofs

A Concrete roofs can consist of pre-cast concrete slabs or in situ concrete slabs. The pre-cast concrete slabs or rib and block slabs experience more variable movement across the length of the substrate as compared to in situ concrete slabs. The waterproofing contractor must take extra care in choosing the right product for concrete roofs.  Torch on membranes are the most popular roofing system for concrete roofs. Cementicious waterproofing systems have also been used on concrete roofs. Caution must be exercised to use cementitious waterproofing systems on smaller concrete areas.

Applying a "torch on" membrane to a concrete roof

The concrete roof is primed with a bitumen primer to settle dust and facilitate adhesion upon which a 4mm or 5mm torch on membrane is applied using a gas flamed torch. The waterproofing contractor makes provision for overlaps and flashings on a roofing system like this. The final application of bitumen aluminium paint in two coats occurs once the membrane has sufficiently weathered.

Anker Projects have completed many concrete roof waterproofing projects that have stood the test of time. Our technical expertise coupled with years of experience make us the ideal waterproofing contractor for your concrete roof waterproofing