Franklin, TN · Roof waterproofingRoof Waterproofing in Franklin, TN

Water on a roof follows one rule: it runs downhill and slips into any gap that faces the wrong way. Every waterproofing detail is built around that rule. Flashing pieces overlap like shingles so each hands water to the piece below; membrane goes under the shingles wherever water slows down or backs up, at valleys and eaves; and edge metal carries runoff past the fascia into the gutter. Reverse or skip one of those laps and a roof can look fine from the street while the decking underneath stays wet.

Pitch is the other variable. A steep main roof drains quickly and forgives small mistakes, while a nearly flat porch roof, the cap over a bay window or the shallow section where an addition meets the house holds water long enough to find every weakness. Those areas need membrane roofing or seamed metal rather than shingles. On Franklin homes they turn up on historic houses near downtown, where porches and rear additions often went on decades apart, and on newer homes where a covered patio or sunroom joins the main roof.

JACCO handles roof waterproofing and flashing details as part of new roofs, additions and repairs, often alongside the carpentry that water has already damaged. Where a roof meets brick, we check whether counter flashing is properly set into the mortar joints; where it meets siding, we look for kick-out flashing that turns water into the gutter instead of down the wall. Each detail is written into the scope, so you know what is being corrected and why.