Flat roofs are commonly called “low-slope” roofs and are found on commercial buildings in many areas.
In simplest terms, The National Roofing Contractors Association states the criteria for a slope to be of 3:12 or less to be a flat roof.
What is single-ply roof membrane?
Single Ply Roofing membranes that are applied in one layer. Single-Ply membranes come in five basic types: (1) Ballasted, (2) Fully-Adhered,(3) Mechanically-Fastened, (4) Partially-Adhered, and (5) Self-Adhered.
Seams of Single-Ply Membranes can be heat welded, solvent welded, and adhered using seam tape or other adhesives.
What materials are used in flat roofing?
EPDM – Ethylene Propylene Diene Terpolymer
This system is a black single-ply membrane, often referred to as “rubber roofing.”
- EPDM systems require minimal maintenance and are resistant to UV radiation and ozone.
- EPDM technology has proven effective for more than 30 years.
- It withstands temperature extremes and expands and contracts with the building.
TPO – Thermoplastic Olefin
This type of system provides long-term durability and the security of heat-welded.
TPO’s advantages include:
- TPO traditionally has a white ‘reflective surface’ which reduces cooling costs.
- TPO roofing systems are the most environmentally friendly of the single-ply systems.
- They produce no dioxins or chlorine. Membranes come in varying thicknesses to meet your specific requirements and are available in varying roll widths.
PVC – PolyVinyl Carbonate
These systems are among the easiest single-ply roofing membranes to install and heat-weld together.
- These systems are able to resist various chemical effluents.
- They provide superior resistance to punctures and tears.
- PVC systems are especially suited for roofs that are exposed to concentrations of grease, oils, and many kinds of fuels.
- In areas where acid rain or other forms of acidic outflow is a problem, PVC roofs are the preferred solution.