BuildCompared

TPO vs PVC Roofing

TPO and PVC are both single-ply membranes with heat-welded seams, allowed on roofs with a slope as low as 1/4:12 (2 percent).[1, 2, 3] The differences are in their standards: the TPO standard requires 10,080 kJ of lab UV exposure against 6,300 kJ (5,000 hours) for PVC, while PVC requires at least 16 mils of material over the reinforcing scrim.[4, 5]

Sources checked How we compare

TPO

Heat-welded seam: the two sheets are fused together where they overlap
Seams are heat-welded

Pick TPO if you want the membrane whose standard has the longer lab UV test, or a guarantee tied to a thicker sheet, such as up to up to 20 years (45 mil), 25 years (60 mil) and 30 years (80 mil).[2, 4]

PVC

Heat-welded seam: the two sheets are fused together where they overlap
Seams are heat-welded too

Pick PVC if you want the higher initial reflectance in the white products we checked, or a manufacturer that lists protection against chemical exposure (GAF does, though its guarantees do not cover chemical damage).[2, 3, 6]

At a glance

TPOPVCSource
Material standard ASTM D6878 ASTM D4434 [1]
Minimum slope in the code 1/4:12 (2 percent) 1/4:12 (2 percent) [1]
Seams Heat-welded (GAF EverGuard TPO) heat-welded with hot-air welding equipment (Carlisle Sure-Flex PVC) [2, 3]
Required material over the scrim 15 mils on 45-mil sheets, 18 mils on 60-mil sheets 16 mils [4, 5]
Lab UV exposure in the standard 10,080 kJ 6,300 kJ (5,000 hours) [4]
Thicknesses (example) 45, 60 and 80 mil (GAF EverGuard TPO) 50, 60 and 80 mil (Carlisle Sure-Flex PVC) [2, 3]
Solar Reflectance Index, white 101 initial, 92 after 3 years (GAF EverGuard TPO) 110 initial, 86 after 3 years (Carlisle Sure-Flex PVC) [2, 3]
Manufacturer guarantee (GAF) up to 20 years (45 mil), 25 years (60 mil) and 30 years (80 mil) up to 30 years [2, 7]
In the U.S. market since early 1990s Not stated in the sources we used [4]

What the standards require

Building codes point to a separate ASTM standard for each membrane: ASTM D6878 for TPO and ASTM D4434 for PVC, including PVC blended with KEE.[1]

Both membranes are reinforced with a fabric scrim, and the standards set a minimum amount of material above it: 15 mils on 45-mil sheets, 18 mils on 60-mil sheets for TPO, and 16 mils for PVC.[4, 5]

The lab UV (xenon-arc) exposure is longer in the TPO standard: 10,080 kJ, against 6,300 kJ (5,000 hours) in the PVC standard.[4] The first ASTM standard for TPO was published in 2003.[4]

Field performance studies

IIBEC reports that in a UV exposure study, TPO membranes on average kept their physical properties better than PVC, KEE and EV membranes, with large differences among TPO products.[4] We did not find a neutral, published service-life figure in years for either membrane, so this page does not show one.

Seams and installation

Both are thermoplastic sheets joined with heat. Carlisle says its TPO is heat-welded, usually with an automatic heat welder, and its PVC is heat-welded with hot-air welding equipment.[3, 8]

Reflectance

White sheets of both membranes are highly reflective. In the products we checked, the white PVC starts higher and ends lower after three years of weathering: a Solar Reflectance Index of 110 initial, 86 after 3 years for Carlisle Sure-Flex PVC, against 101 initial, 92 after 3 years for GAF EverGuard TPO.[2, 3] Values vary by product and color, so check the Cool Roof Rating Council listing of the exact product.

Cost

We did not find a neutral, published installed-cost comparison for TPO and PVC, so this page does not show one.

Common questions

Is TPO the same as PVC?

No. Both are heat-welded single-ply membranes, but they follow different ASTM standards: ASTM D6878 for TPO and ASTM D4434 for PVC.[1]

What is the minimum slope for a TPO or PVC roof?

The residential code requires a design slope of at least 1/4:12 (2 percent) for single-ply membranes.[1]

Which one is more reflective?

In the white products we checked, PVC started higher (110 initial, 86 after 3 years) and TPO held its value better (101 initial, 92 after 3 years).[2, 3]

How thick are TPO and PVC membranes?

Common thicknesses are 45, 60 and 80 mil for TPO and 50, 60 and 80 mil for PVC.[2, 3]

Sources

  1. California Building Standards Commission 2025 California Residential Code, Section R905 Requirements for Roof Coverings (effective January 1, 2026). Accessed November 3, 2026.
  2. GAF EverGuard TPO 45, 60 and 80 mil data sheet (COMEG876) (2026). Accessed November 3, 2026.
  3. Carlisle SynTec Systems Sure-Flex PVC Membrane Product Data Sheet (reprint 605245 PVC-1024) (October 10, 2025). Accessed November 3, 2026.
  4. International Institute of Building Enclosure Consultants (IIBEC) Technical Advisory No. 12: TPO Single-Ply Roof Systems, Performance and Service Life (2016, revised 2025). Accessed November 3, 2026.
  5. Carlisle SynTec Systems SpecTopics: Understanding ASTM Standards for Roofing Membranes (December 2021). Accessed November 3, 2026.
  6. GAF EverGuard PVC Fleece-Back data sheet (COMEG864) (COMEG864-PDF-0326). Accessed November 3, 2026.
  7. GAF PVC Systems membrane offering (COMEG449) (COMEG449-PDF-1125). Accessed November 3, 2026.
  8. Carlisle SynTec Systems Sure-Weld TPO Reinforced Membrane Product Data Sheet (reprint 600515 TPO-2012) (January 28, 2026). Accessed November 3, 2026.

We did not install or test these products. Everything on this page comes from the documents listed above. If a source changes, numbers here may be out of date until our next check. Spot an error? Email [email protected].