Backwater Laps

//Backwater Laps

Backwater Laps

When installing a roof system it is important to always start at the lowest point and proceed upward toward the roof’s peak. This ensures that each layer of materials overlaps the previous. Even on flat roofs, this principle is important. As water travels, on a pitch or on a flat roof, if two seams are lapped in backwards a backwater lap occurs. This can “cup” water and force in under the layers, causing leaks.

2014-04-14T14:11:46+00:00