What is Roofing Membrane?

Membrane roofing is a roofing system often used in flat or almost flat roofs to move water off the roof and prevent leaks. It is commonly made of synthetic rubber, modified bitumen and thermoplastic. It has found wide usage in commercial buildings and are also becoming increasingly used in residential buildings.

Types of Membrane Roofing
Membrane roofing systems come in three basic types, which are: thermoplastic membrane, thermoset membrane and modified bitumen.

Thermoset Membrane
In a thermoset membrane roof, rubber sheets are laid on the surface of the roof with overlapping seams. These Sims are heated thereby causing layers of rubber to melt together. Because of the types of rubber used with this method, the heat makes the sheets to form a strong chemical bond, causing the seams to become as strong as the sheets themselves. The rubber formed is about 0.75mm to 1.5mm, which makes it completely impenetrable to water leaks.

Thermoplastic Membrane
The thermosplastic roof membrane systems are somewhat similar to the thermoset systems. It is made with PVC or other similar materials and not rubber. These PVC, when heated, do not bond chemically, but rather form tight seals that keep water from getting to the seams. They are usually not as costly as the thermoset roofing membranes, but often require frequent maintenance and repairs.

Modified Bitumen
Modified bitumen evolved from asphalt roofing. This roofing membrane comprises of asphalt, solvent and a different types of modifiers. The pieces of these materials can be connected in several ways. When heat is applied, the seams are heated which melt the asphalt together to create a strong seal. It also has some self-adhesive forms of this system and a cold applied adhesive application process.