We do a new roof on 98% of the jobs we install solar on so that both can co exist and last as long as possible for our customers. The racking system that holds the panels in anchored into the rafters or beams in the attic with lag bolts that can sustain hurricane worthy wind speeds. These penetration points are then flashed and sealed the flashing covers the penetration point with a lip that makes it virtually impossible for water to get in there. These penetration points are also warranteed in writing on our contracts as being water tight. In almost a decade of solar less than 14% of homeowners experience leaks due to solar installation.