Types of roof systems are determined by the covering used. There are five major types of low slope/flat roof systems, namely:
- Built-up roof
- Modified bitumen
- Polyvinyl chloride
- Thermoplastic Polyolefin
- Ethylene Propylene Diene Terpolymer
Built-up roofing (BUR) membranes are made of bitumen and felts. The membranes are spread on a base sheet attached to the roof. The popularity of BUR low slope roofs is diminishing.
Modified bitumen are sheets made from bitumen that have been improved using a polymer like Styrene-butadiene (SBS) or atactic polypropylene (APP). The polymers add rubber qualities to the bitumen. The modified bitumen sheets are joined using an adhesive and heat.
PVC low slope roofs are common in restaurants. They are used for roofing kitchens and can tolerate different types of chemicals. PVC can also bend and keep your house cool during summer because it is a poor conductor of heat.
Thermoplastic Polyolefin TPO is typically a single-ply membrane. It is lightweight, resistant to chemicals, and has impressive impact resistance. TPO low slope roofing systems are commonly found in the commercial industry. Homeowners love the white color TPO membranes for their ability to reflect heat and keep the interior of the house cool.
Ethylene Propylene Diene Terpolymer (EPDM)
EPDM rubber roofs adhere to an insulation board, and they are mostly black, although there’s white color. The rubber covering can also be held down using ballast or boulders. This type of roof can tolerate both hot and cold weather. The rubber can withstand different chemicals.