Our estimators inspect the roof covering, the drainage systems, the flashing (another are many types of roof systems and membranes available. This can depend on building use, access, weight loads, foot traffic, number of penetrations, cost, etc. all play a factor in roof selection. Our sales representatives will take the time to show the composition of the types, the distinctions in the various brands, how they’re tested, what the warranties are, and which suits your specific needs and budget.und skylights, chimneys, vent pipes), and the ventilation systems.