Flat Roof Leaking At Flashing

On a flat roof we suggest starting at 100mm of overhang.

Flat roof leaking at flashing.

Over time this continued expansion and contraction can cause the flashing to pull away from the edges and corners of your roof leading to leaks and moisture that can get trapped inside your roof. Flashing just like most other materials asphalt flat roofs tend to expand and contract with changing weather and temperatures. This flashing rests on the front edge of the lowest batten with a squash fold to direct any possible. Just make sure you leave enough room for gutter maintenance.

Flashing on a wall above a flat roof. If you can aim for 150mm. Metal flashing copper bend at a 90 degree angle making the transition between the roof and chimney. The other issue is if the installer nailed the shingles through the flashing then those nails could start rusting and cause a skylight to leak.

Flashing is the number one cause of leaks on flat roofs. Metal flashing that runs alongside a wall loosens up or the caulking gives and a major leak starts. Install a gutter flashing between the gutter and the roof sheeting. It is the first place to troubleshoot for leaks on a roof.

The minimum standard is 50mm.