Roof deckSteel, concrete, wood, gypsum, cementitious wood fiber, or another substrate changes fastening, repair, testing, and allowable loads. Corrosion, deterioration, deflection, and openings must be addressed.
Air or vapor controlInterior humidity, building use, deck type, and climate influence whether and where control layers belong. These decisions should be designed, not added automatically to every building.
Insulation and slopeInsulation provides thermal performance and can create positive drainage through tapered design. Multiple staggered layers reduce aligned joints and provide a better substrate than one thick layer with continuous gaps.
Cover boardA compatible cover board can improve dimensional stability, provide a stronger membrane substrate, and increase resistance to traffic or impact. Type and thickness depend on the system and exposure.
Membrane and detailsThe field membrane, seams, drains, scuppers, curbs, penetrations, parapets, edge metal, expansion joints, walk pads, and terminations must work together. Most leaks begin at details, not in an untouched sheet of membrane.