EPDM rubber roofing
Seams, flashing and boots on membrane roofs.
Almost every older valley house has a flat section somewhere, and it's almost always what fails first.
Porch roofs, rear additions, dormer decks and the low-slope sections tucked behind a gable drain slowly, hold snow and debris, and put every seam and penetration under standing water. They fail years before the sloped field above them does.
Ponding is the diagnostic. Water still standing 48 hours after rain stresses seams, accelerates membrane aging, and is usually a drainage or slope defect rather than a membrane defect — which means replacing the membrane without fixing the slope buys you the same problem again.
A clean puncture or an open seam patches well. A membrane that has shrunk, gone brittle, or has wet insulation trapped underneath is past patching, and probing for wet insulation before quoting is the difference between an honest scope and a guess.
Seams, flashing and boots on membrane roofs.
Low-slope over occupied space, after hours.
Trace the path instead of patching the stain.

Primary coverage is Pittsburgh and Allegheny County, with regular dispatch into the close South Hills, North Hills, and Washington County towns.
Water still standing 48 hours after rain is. It stresses seams and ages the membrane, and it usually points at slope or drainage rather than the membrane itself.
A clean puncture or open seam patches well. A shrunken, brittle membrane — or wet insulation underneath — is past patching.
Depends heavily on the system and the drainage. Good drainage and maintained flashings matter more to the number than the material does.
24/7 dispatch for leaks, storm damage, hail, fallen limbs and ice dams across the Ohio Valley.