Flat and low-slope roofs — anything under a 2:12 pitch — are a completely different animal than standard architectural shingle roofs. Water sits on them instead of running off, which means the waterproofing material itself has to handle standing water, ponding, UV exposure, and the full range of Chicago temperature swings. Shingles will not work here, which is why you see tar, rubber, or membrane roofs on additions, porches, garages, and many commercial buildings.
Dynasty Restoration installs and repairs all three common flat-roof systems: TPO (thermoplastic polyolefin), EPDM rubber, and modified bitumen. We match the material to the application and the budget, and we install every system with the correct edge metal, termination bars, and drain detailing — the details that decide whether a flat roof lasts 15 years or 30.
Flat Roof Systems We Install
TPO Membrane
White reflective single-ply. Heat-welded seams. Highest energy efficiency of the three. Excellent on residential additions and commercial retrofits. Typical lifespan 20–30 years.
EPDM Rubber
Black synthetic rubber membrane. Proven cost-effective performer with a 40-year track record in the Midwest. Great for shaded and lightly-trafficked flat roofs. Typical lifespan 20–25 years.
Modified Bitumen
Multi-ply torch-down or self-adhering asphalt. Traditional flat-roof system with excellent cold-weather flexibility and puncture resistance. Typical lifespan 15–25 years.
Why Flat Roofs Fail — And How to Prevent It
Flat roofs almost never fail in the field. They fail at seams, penetrations, and edge terminations — the places where the membrane meets something else. Poorly welded TPO seams, unsealed EPDM pipe penetrations, and failing edge metal are the top three causes of leaks we see. Our install process addresses each of these with heat-welded seams, manufacturer-spec boots on every penetration, and properly fastened drip edge and coping. Repair work gets the same treatment.