FROM OUR PROJECT COLLECTIONSeparate drainage from the membrane choice
Drains, scuppers and roof edges are part of the water path. Ask how areas of water collection were assessed and whether the proposed work changes the cause. Installing another top layer does not by itself establish that a drainage or roof-configuration problem will disappear.
Then compare the selected roofing material and its connection requirements. Thermoplastic membranes, EPDM and asphaltic systems use different details. The proposal should identify the actual system, attachment and flashing approach, including the relationship to curbs and other rooftop equipment.


