Seal A Leaking Flat Roof

If you take that step be sure to cover the nail heads with tar roof sealant or peel and stick flashing patch.

Seal a leaking flat roof.

Leaks in wooden roofs are commonly caused by a gap between the panels which move during expansion and contraction. Do a small area at a time to really pinpoint the cause of the leak. Clean and dry the area you wish to apply flex seal. This can be done by pouring a small amount of water over the area you suspect the hole in your roof is located and checking for the leak underneath.

The patch should be adhered from the centre over the hole outwards with a firm hard roller. When the membrane is completely dry apply the appropriate roof repair material such as roof cement tar or peel and stick patch. Some roofers also suggest using 6d roofing nails to secure the blister flaps. Step 2 fill a caulking gun with a watertight polyurethane or oil based sealant and hold it at an angle to insert the product directly into the gap.

This will help the new coating seal where it overlays the old roof coating edges and will reduce the chances of leaks at those locations. Feathering or tapering the edges of thick but sound roof coating. For a gap of 1 inch or less caulking or sealant is the best method of repair.