EPDM vs TPO vs Modified Bitumen for Brooklyn Flat Roofs

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Short answer: EPDM, TPO and modified bitumen are all proven flat roofing systems. EPDM is flexible rubber that is easy to repair, TPO is a reflective white membrane with heat-welded seams, and modified bitumen is a thick asphalt membrane that handles foot traffic well. The best choice depends on your roof's use, sun exposure and budget.

In this guide

Quick comparison
Which should you choose?

Quick comparison

System	What it is	Estimated life*	Often chosen for
TPO	TPO (thermoplastic polyolefin) is a single-ply roofing membrane, usually white, whose seams are welded together with hot air.	7–20 yrs	Sunny roofs over top-floor apartments
EPDM	EPDM (ethylene propylene diene monomer) is a synthetic rubber roofing membrane, usually black, used on flat and low-slope roofs.	15–25 yrs	Rowhouse and brownstone roofs with little foot traffic
Modified Bitumen	Modified bitumen (often called a modified bitumen system, or MBS) is asphalt roofing reinforced with polyester or fiberglass and modified with polymers, installed in rolls on flat and low-slope roofs.	~20 yrs	Roofs with HVAC equipment or regular foot traffic
Built-Up (BUR)	Built-up roofing, often called tar and gravel, is made of several alternating layers of bitumen (asphalt or coal tar) and reinforcing roofing felts, finished with a surface of gravel or a mineral cap sheet.	~30 yrs	Larger flat roofs and older buildings with existing BUR
Rolled Roofing	Rolled roofing is mineral-surfaced asphalt roofing sold in rolls and nailed or adhered to low-slope roofs.	Not listed	Garages, sheds and porches

*Estimated life expectancy from InterNACHI's Standard Estimated Life Expectancy Chart, assuming regular maintenance. Guidelines, not guarantees or warranties. "Not listed" = no figure in that source.

Which should you choose?

Low-traffic rowhouse roof: EPDM or modified bitumen
Hot top floor, large roof: TPO (reflective)
Equipment or regular foot traffic: modified bitumen or built-up roofing

[Owner: add your own recommendation and why, from experience]

Get an answer for your roof

Every roof is different. Call (347) 888-9591 or request a free estimate. Related services: Flat Roofing · TPO Roofing · EPDM Rubber Roofing · Modified Bitumen Roofing (SBS, Torch-Down & Glue-Down).

Frequently Asked Questions

What's better, TPO or EPDM?

Neither is better for every roof. TPO has heat-welded seams and a reflective surface; EPDM is flexible rubber with a long track record and simple repairs. We recommend one based on your roof's size, sun exposure, traffic and budget.

Is your crew certified for torch-down roofing?

Yes. Our crew is FDNY-certified for torch-applied roofing. Where open flame is not appropriate, we use cold-process (glue-down) or self-adhered modified bitumen instead.

What is cold process (glue-down) roofing?

Cold process roofing bonds modified bitumen sheets with cold-applied adhesive instead of a torch or hot asphalt. It avoids open flame and odors from hot kettles.

Is EPDM better than modified bitumen?

EPDM is lighter and more flexible; modified bitumen is thicker and handles foot traffic better. For a roof with mechanical equipment or regular access, modified bitumen is often the stronger choice.