Flat Roof Leaking At Flashing

Just make sure you leave enough room for gutter maintenance.

Flat roof leaking at flashing.

The best way to. On a shingle roof the flashing will get clogged with debris and in turn the water will get diverted under the shingles where it could start leaking. Flashing just like most other materials asphalt flat roofs tend to expand and contract with changing weather and temperatures. Flashing is the number one cause of leaks on flat roofs.

It is the first place to troubleshoot for leaks on a roof. The minimum standard is 50mm. 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. 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.

Metal flashing that runs alongside a wall loosens up or the caulking gives and a major leak starts. If you can aim for 150mm. On a flat roof we suggest starting at 100mm of overhang. This video demonstrates where flashing could be leaking from on a brick wall.

Flashing on a wall above a flat roof.