Flat Roof Cost: TPO vs EPDM vs PVC Compared
By Roofing Price Tool Editors · 6 min read
What flat roof replacement costs in 2026, what TPO, EPDM, and PVC actually are, and which one is the right call for a residential flat or low-slope roof.
Quick answer
For a residential flat or low-slope roof (under 2/12 pitch), plan on $6 - $12 per square foot installed. TPO is the budget pick at $6 - $9/sqft and the current default for residential. EPDM (black rubber) runs $5 - $8/sqft, lasts the longest, and works best in cold climates. PVC is the premium pick at $9 - $14/sqft, chemical-resistant, and used on restaurants and roofs with heavy mechanical equipment.
TPO (Thermoplastic Polyolefin)
White single-ply membrane, heat-welded at the seams. Reflects sun (energy bills drop 10 - 20% in hot climates), looks clean, and installs fast. Has been the dominant residential flat-roof choice since the late 2000s.
- Cost: $6 - $9/sqft installed
- Lifespan: 20 - 25 years
- Best for: Hot/sunny climates, residential, additions
- Watch out: Quality varies wildly by manufacturer. GAF EverGuard, Carlisle Sure-Weld, and Firestone UltraPly are the proven names. Cheap import TPO has had documented failures.
EPDM (Ethylene Propylene Diene Monomer)
Black rubber membrane, glued or fully adhered. The oldest of the three single-ply systems and the most field-proven - the original EPDM roofs from the 1970s are still on commercial buildings. Soaks up heat (downside in the South, upside up north).
- Cost: $5 - $8/sqft installed
- Lifespan: 25 - 35 years (longest of the three)
- Best for: Cold climates, simple low-slope roofs, garages and porches
- Watch out: Seam tape can fail at 15 - 20 years. Modern fully-adhered systems with welded seams (rather than tape) avoid this.
PVC (Polyvinyl Chloride)
White heat-welded membrane like TPO, but a different chemistry. Resistant to grease, oils, and chemicals - which is why it dominates restaurant and industrial roofs. More expensive but more forgiving in harsh conditions.
- Cost: $9 - $14/sqft installed
- Lifespan: 25 - 30 years
- Best for: Roofs near commercial kitchens, rooftop HVAC with oil drips, chemical exposure
- Watch out: Overkill for a typical residential porch or addition. The cost premium isn't justified unless you actually have chemical exposure.
What's in the per-square-foot price
A typical flat-roof replacement quote should include:
- Tear-off of existing membrane and disposal
- Inspection and replacement of wet/rotted decking
- New cover board (polyiso, dens-deck, or fiberboard)
- Tapered insulation if needed for slope/drainage
- New membrane with welded seams
- New edge metal, drip edge, and termination bars
- New flashing at walls, curbs, and penetrations
- New scuppers, drains, and gutters as needed
The cheap quotes you'll see ($4 - $5/sqft) almost always skip insulation, reuse old flashing, and don't address slope. Those roofs pond water and fail in 8 - 10 years.
How to pick
- Hot south, low complexity: TPO. Cheaper than PVC, reflective, fast install.
- Cold north, porch / garage / shed: EPDM. Longest life, cheapest of the three, no UV concerns since it's dark.
- Anywhere with grease/chemical exposure: PVC. The only one that holds up.
- Hot south, complex roof with lots of penetrations: PVC or upgrade TPO to a 60-mil or 80-mil membrane.
Run the calculator with your flat-roof square footage to get a tighter range. Flat roofs are priced by complete system, not just membrane - the calculator accounts for the insulation, edge metal, and flashing that actually drive the total.
Sources: NRCA · IIBEC (formerly RCI)