chemical · input
Fastest-growing commercial roofing membrane; heat-weldable seams; Firestone, GAF, Carlisle dominant producers; manufactured from ethylene-propylene rubber + polypropylene; requires specialized chemical feedstock
12
Source countries
5
Companies
1
Goods affected
0
Claims on record
What depends on it
1 essential American goods rely on thermoplastic polyolefin (tpo) roofing membrane somewhere upstream in their supply chain.
Where it comes from
Share of global supply, by country.
| Country | Share of supply |
|---|---|
| CACanada | 37% |
| CNChina | 6% |
| MXMexico | 6% |
| DEGermany (Federal Republic of Germany) | 6% |
| KRSouth Korea (Republic of Korea) | 6% |
| VNVietnam | 6% |
| JPJapan | 6% |
| INIndia | 3% |
| TRTurkey | 3% |
| ITItaly | 3% |
| THThailand | 2% |
| FRFrance | 1% |
Who makes it
5 companies produce thermoplastic polyolefin (tpo) roofing membrane.
Dominant US EPDM and single-ply commercial roofing membrane producer; division of Carlisle Companies (NYSE: CSL). Estimates place CarlisleSynTec at ~45% of the US EPDM roofing membrane market. Manufactures EPDM, TPO, and PVC membranes; Carlisle, PA plant is the primary fabrication site.
Second-largest US EPDM roofing membrane producer; subsidiary of Bridgestone Americas (and ultimately Bridgestone Corporation, Japan). Markets UltraPly TPO and EPDM membranes; Carmel IN is primary US operations hub. Leverages Bridgestone's rubber polymer expertise from automotive rubber to commercial roofing.
Largest US roofing manufacturer; ~33% US asphalt shingle market share; subsidiary of Standard Industries (Koch network); also makes TPO/EPDM commercial membranes
World's second-largest cement producer by capacity (~274 Mt/yr). Record performance 2024. Divested US cement operations in 2024 (spun off as "Amrize"). Operates in 60+ countries with vertically integrated quarrying through distribution.
Major fiberglass mat, insulation, and roofing products manufacturer; owned by Berkshire Hathaway; produces fiberglass scrim mat for asphalt shingles; Denver CO headquarters
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