Toronto Roofing

Skip to content

Blog Categories

Monday, 29 November 2010 12:00

Flat roofing Toronto. Leaking modified bitumen flat roof in Toronto.

Written by Marcin

font size decrease font size increase font size
Print
E-mail

Rate this item

1
2
3
4
5

(1 vote)

We recently installed our two ply modified bitumen SBS flat roofing system on a pair of leaking flat roofs in Cabbagetown, Toronto. The flat roofs were leaking due to improper application of the roofing membranes resulting in both condensation and leakage through the seams. Watch our roofers cut the membrane and expose a roof that appears to be in good condition yet, contains a significant amount of water underneath and between the membranes.

Our Cabbagetown, Toronto client was experiencing serious leakage in the bathroom of his townhouse. Contributing to this leakage were improperly sealed seams along the edge of the roofing membranes. The roofing membranes are to be heat sealed using a propane torch such that the edge of one membrane roll is overlapped and bleeds onto the previously applied membrane roll. This bleed will ensure the roof will not leak. The bleeds on this roof were very small or non-existent which eventually results in the rubber membrane lifting and allowing water to travel under the membranes. Also, improper heating and application of the rubber itself will lead to air pockets between the roof deck and the rubber membranes causing condensation. Both of these issues were the cause of the leakage on this particular roof as is generally the case.

We proceeded to strip the entire roof and install our two-ply modified SBS bitumen flat roofing system, using Soprema 180 base membrane, 250 cap membrane and 1.5 inch poly iso insulation. We also installed a new copper drain with a u flow seal. Uflow seals are designed to be tightened using internal screws which compresses the thermoplastic seal, forcing it to expand and make contact with the wall of the old pipe. This prevents vertical movement and stops water backup damage.