10/16/2019
How to repair flashing on a flat roof that is leaking. The most common places for leaks on flat roofs is the flashing. The counter flashing on the cement block comes loose and caused significant leaks.
We used Turbo Poly Seal from https://bergstromm.com/
How to repair flat roof flashing leaks:
1. Remove all old caulking and tar that was used to seal the flashing
2. Use an angle grinder with a hardwire steel cone brush to remove about five inches of paint on the brick or cement wall above the metal flashing
3. Wipe the metal flashing thoroughly with lacquer thinners to remove any residue of silicone from the metal
4. Use masking tape to seal about three inches on the wall above the metal and also 2 inches below the grove on the metal. (this is for making it look clean when done)
5. Apply one coat of Turbo Poly Seal covering the entire area between the two masking tapes
6. While wet, embed the Polyester Fleece into the Turbo Poly Seal
7. Apply a coat of Turbo Poly Seal to cover the entire fleece
8. Wait 10 min and then remove the masking tape
8. After a few days, the Turbo Poly Seal flashing can be painted with a urethane-based paint.
This method will ensure that the flashing will be sealed and no more leaks on the flat roof. Turbo Poly Seal can be used for other flashing details on flat roofs such as skylights, vent pipes, and drains.
How to determine if the flashing is leaking:
1. Use a putty knife and poke it in between the caulking and the wall surface. Usually, the caulking or sealant loosen up from the brick surface.
2. Walk next to the wall where the flashing is to see if any soft areas on the roof can be detected.
3. A leak or stain on the ceiling below could also be a telltale.
4. Find a person that is familiar with roof repairs to help determine where the leak is coming from.
Like any other part of a building or house, flat roofs should have a maintenance schedule by a professional. There is nothing in life that lasts forever, and Flat Roofs, especially the flashing, is one of those areas that need periodic maintenance.
