Townhomes, plazas and rooftop equipment
Attached homes bring shared roofs and shared walls, so a leak on one unit can affect its neighbor. Roofing there is often arranged through a homeowners association, with decisions made for the building as a whole. Gutters, downspouts and flashing at party walls are common trouble spots.
The local shopping plazas and small offices have flat or low-slope roofs with rooftop heating and cooling units, vents and skylights. Each of these penetrations is a point where water can enter. Service technicians who walk the roof can also cut or puncture the membrane. Solar arrays on both homes and businesses add weight, wiring and attachment points that have to be handled with care during any roof work.

