Types of Flat Roof Materials

Although most residential buildings have sloping roofs, many multi-family and commercial buildings use flat roofs. Flat roofs, just like sloping roofs, are constructed from a wide range of materials by professionals like ABC Roofing. Types of flat roof materials include asphalt roll roofing, metal roofs, vegetated green roofs, etc. The range of Roof Trader flat roof materials offers numerous options for your flat roof.

Asphalt roll roofing

This type of flat roof material generally comprises one fibreglass base felt or asphalt-saturated organic layer applied on top of roofing felt with cold asphalt cement and nails, and typically covered by a granular mineral topping. Asphalt roll roofing typically lasts for about 10 years.

Metal roofing

Metal roofing is usually available in two basic classifications; structural and non-structural. The main difference between the two roof types is that the former attaches directly to lathe boards or purlins and doesn't require any form of support underneath it. On the other hand, structural metal roofing needs a solid substrate underneath it, usually metal roof deck, plywood and oriented strand board. Metal roof systems are among the most lightweight roofing products and are a perfect choice for retrofit jobs.

Vegetated (green roof)

Vegetated roofs consist of a membrane, either thermoplastic or thermoset, covered with vegetative cover and soil. They not only reduce the energy consumption of a building, as well as local island heat effect, but also absorb rainfall, thereby lowering town storm water runoff.

Single-ply membranes

The most commonly used materials in single-ply roofs include modified bitumen, thermoplastic and thermoset. They are often cheaper to install, lighter in weight, more durable, and more energy-efficient compared to built-up roofs. These roofs can be attached mechanically, chemically, or affixed with ballast, usually aggregate or gravel. Single-ply roofs can last for 10-20 years, which depends on the material used as well as the service conditions.

Built-up roofs

A built-up roof comprises the roof deck, insulation, membrane, vapour retarder and surfacing material. Bitumen and felts make up the roofing membrane. Bitumen provides the adhesive properties and waterproofing agents of the system. Felts strengthen and steady the membrane.

Rubber membrane

This is another type of flat roof material. It is durable and can withstand the usual wear and tear. Its cost is quite high, although it is easy find and repair leaks. It is also quick to fit, and causes little or no disruption during the process.