Roofs, hills and storm runoff in a wooded setting
Rolling terrain affects how water runs off a property. Slopes carry runoff down driveways and across lawns, and the low spots collect algae and slippery film. Hillside driveways in winter gather salt and grime, and in summer they grow green at the edges where the surface stays damp.
Wooded lots drop leaves, pollen and needles onto roofs. Asphalt shingles under trees often show black streaks, which are algae feeding on the limestone filler in the shingle. High pressure strips the protective granules, so a roof should be cleaned with a low-pressure soft wash instead. Steep pitches and mossy surfaces are slippery and unsafe to walk on, so we plan fall protection and weather timing carefully before anyone goes up.
