Concrete Roof Waterproofing Methods
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Concrete roof waterproofing methods. 12 waterproofing of reinforced concrete flat roof 12 1 background most roofs in singapore are constructed using reinforced concrete which is known to have pores or capillary tracts. A gallon covers between 50 70 square feet per coat and two coats should be used to get the best result. The surface shall be free from standing water. These pores are interconnected within the concrete.
Pour your chosen vapor barrier into a paint sprayer after the primer is dry and liberally spray an even coat onto the concrete roof. Work systematically from one end to the other spraying in lines. Depending on the designed strength density and installation techniques the number of pores can vary. Topical sealers can be made from acrylic epoxy and polyurethane based materials.
Allow the vapor barrier to dry before you add a second coat. When waterproofing concrete a topical sealer is applied to the surface of the concrete. The concrete surface substrate shall be clean and free from contamination such as dust oil grease organic growth and release agents etc. Surface substrate preparation is the most important for roof waterproofing system before application.
The sealer is impermeable provided it is applied correctly and forms a waterproof membrane around the concrete preventing moisture from entering the concrete.