CSLB C-39 Roofing ContractorLow-Slope RoofingEasy
A client wants a single-ply membrane that reflects sunlight to reduce cooling costs and is typically manufactured in white sheets, unlike EPDM which is almost always black. Which membrane best fits this description?
- ABuilt-up roofing (BUR)
- BEPDM
- CTPO
- DModified bitumen (SBS)
Show answer & explanationAnswer & explanation
Correct answer: C. TPO
TPO (thermoplastic polyolefin) is most commonly manufactured in white or light colors for high solar reflectance, making it a popular choice for cool-roof applications, whereas EPDM is typically black.
Why the other options are wrong
- A. BUR is a built-up system, not a reflective single-ply sheet membrane.
- B. EPDM is generally black and absorbs heat rather than reflecting it.
- D. Modified bitumen is asphalt-based and typically dark, not reflective by default.
TPO Membrane
Thermoplastic polyolefin single-ply membrane, typically white, known for reflectivity, heat-weldable seams, and energy efficiency.
- Usually white for solar reflectance
- Seams are hot-air welded
- Popular for cool-roof compliance
Memory trick: TPO is 'the pale option' — white and reflective.