Flat roofs exist all over the world and each area has its own tradition or preference for materials used. In warmer climates, where there is less rainfall and freezing is unlikely to occur, many flat roofs are simply built of masonry or concrete and this is good at keeping out the heat of the sun and cheap and easy to build where timber is not readily available. In areas where the roof could become saturated by rain and leak, or where water soaked into the brickwork could freeze to ice and thus lead to 'blowing' (breaking up of the mortar/brickwork/concrete by the expansion of ice as it forms) these roofs are not suitable. Flat roofs are characteristic of the Egyptian, Persian, and Arabian styles of architecture.
In such areas, single-ply roofing is one of the best roofing options as single-ply membrane is best suited for all types of weather.
Protected Membrane Roof
A protected membrane roof is a roof where thermal insulation or another material is located above the waterproofing membrane. Modern green roofs are a type of protected membrane roof. This development has been made possible by the creation of waterproofing membrane materials that are tolerant of supporting a load and the creation of thermal insulation that is not easily damaged by water. Frequently, rigid panels made of extruded polystyrene are used in PMR construction. The chief benefit of PMR roof design is that the covering protects the waterproofing membrane from thermal shock, ultraviolet light and mechanical damage. One potential disadvantage of protected membrane roof construction is the need for structural strength to support the weight of ballast that prevents wind from moving rigid foam panels or the weight of plants and growth media for a green roof. However, when flat roofs are constructed in temperate climates, the need to support snow load makes additional structural strength a common consideration in any event.
Synthetic Rubber (Thermoset)
This type of membrane roof is made of large, flat pieces of synthetic rubber or similar materials. These pieces are bonded together at the seams to form one continuous membrane. The finished roof’s thickness is usually between 30 and 60 mils(thousandths of an inch) (0.75 mm to 1.50 mm). The most commonly used thermoset membrane is EDPM. Other types of related materials are CSPE, CR, and ECR. Thermosets are widely used roofing materials due to their ability to withstand damaging effects of sun-rays and chemicals found on roofs.
This is similar to synthetic rubber, but the seams are typically heat-fused (welded) to form a continuous membrane. The 'lap' seams can also be fused with solvents instead of heat, and can be as strong as the rest of the membrane. Other related materials are CPA, CPE, EIP, NBP, PIB, and TPO. Thermoplastic membranes include a reinforcement layer that provides more strength and stability. The most common thermoplastic membranes are PVC (polyvinyl chloride) and TPO (thermoplastic polyolefin).
Locklear Roofing provides complete membrane roofing systems for commercial and residential buildings.
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