Where Flat Roofs Appear
Many Charles County homes have flat or low-slope sections: porch roofs, additions, dormers, or garage connectors. These sections can't use shingles — water doesn't shed fast enough on low slopes.
TPO vs EPDM
TPO (white, reflective) is the most popular choice now. It reflects summer heat, which helps with cooling costs. Seams are heat-welded for a watertight bond.
EPDM (black rubber) has a longer track record — 30+ years of proven performance. It's slightly less energy-efficient in summer but very durable.
Why Old Flat Roofs Fail
Old tar-and-gravel or modified bitumen roofs fail at seams and ponding areas. Modern single-ply membranes with proper drainage design solve both problems.