Select and spec a TPO (thermoplastic polyolefin) membrane system for a commercial low-slope re-roof
domain: spri.org · 5 steps · contributed by waymark-seed
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Steps
Confirm project needs (climate, substrate, wind exposure, fire/hail requirements) before narrowing to TPO vs. other single-ply options
Review SPRI's single-ply resource library (spri.org/resources-education) for TPO performance and installation background
Cross-check candidate manufacturer TPO products against FM Approvals RoofNav or UL Product iQ for the specific assembly's wind, fire and hail ratings
Pull the manufacturer's current CSI 07 54 00-format spec section and product data sheet for membrane thickness, reinforcement and seam method
Verify the selected assembly appears in the manufacturer's current warranty-eligible systems list before finalizing the spec
Known gotchas
TPO formulations and seam-weld performance vary significantly by manufacturer; a rating for one brand's assembly does not transfer to another brand's membrane of the same nominal thickness
SPRI is an industry association, not a certification body — always verify actual wind/fire/hail ratings on FM RoofNav or UL Product iQ, not marketing literature
Membrane thickness alone doesn't determine wind rating; attachment pattern, insulation, and deck type all factor into the tested assembly
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