Flat Roof Installation (TPO, PVC & Modified Bitumen)

Choosing between TPO, PVC and modified bitumen

TPO and PVC are single-ply membranes whose seams are heat-welded into a continuous surface. They are light in color, reflect heat and are available in different thicknesses. PVC resists grease and chemicals, which suits restaurants. Modified bitumen layers are torch-applied or cold-applied and have a long record on residential roofs. The right system depends on budget, foot traffic, building use and local energy rules. A roofer will explain expected lifespan and maintenance for each option.

Drainage, insulation and structure

Ponding water is the enemy of flat roofs, so slope and drains are central. The roofer measures how water moves and may add tapered insulation to improve drainage. Insulation also affects energy performance and code compliance, and the deck must be sound and dry. Check for sagging, soft spots and old leaks, and plan repairs before the new membrane goes down. Ask how scuppers, gutters and overflow drains will be handled. Ask the roofer how foot traffic from HVAC technicians will be handled, since walkway pads protect the membrane in areas that get regular visits.

Flashing details, permits and maintenance

Most leaks occur at edges, drains, pipes and walls, not in the middle of the membrane. Proper flashing, sealed seams and correct terminations are critical. The project needs a permit, and the manufacturer may inspect the roof to issue a warranty. After installation, keep drains clear, limit foot traffic and have the roof inspected annually and after storms. Prompt repair of small punctures keeps the system working for decades. Request a copy of the manufacturer warranty application and the inspection report, which prove the roof was installed to the maker’s specifications.

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