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Flat roofs in Markham are the ones nobody looks at: the garage, the porch, the rear addition — and the plazas and office units along Woodbine and Highway 7. We keep them dry.(416) 846-3797Or send the form and we'll call you back.
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On a Markham house the flat roof is usually the garage or the front portico, covered by the builder with a thin rolled membrane that was never expected to outlast the shingles above it. In Markham Village and Unionville, additions from the 70s and 80s put a flat section onto the back of a house that originally had none — and the joint where flat meets pitched is where those leak. Commercially, Markham has a lot of low-slope roof: retail plazas in Milliken and along Highway 7, and office and industrial units around Woodbine and 14th. Blocked drains and failed seams around rooftop units are the usual calls there.
We look at the whole roof, not just the stain: where the water goes, whether it ponds, how the edges and penetrations were flashed. If the membrane is sound and the failure is at one seam or one curb, we do a bonded repair that becomes part of the roof rather than a patch on top of it. If the surface has cracked, blistered or been patched more than once, it gets replaced — old layers off, deck inspected, tapered insulation to create fall where there wasn't any, new membrane, new flashing. On plazas and offices we work around your tenants' hours.
Repair when the roof is generally intact and you have one clear failure point. Replace when water sits on the roof days after rain, when the surface has gone brittle or alligatored, or when the garage roof is original to a 25-year-old house and has simply never been replaced.
Yes — plazas, office units and light industrial along Highway 7, Woodbine and 14th Avenue. We'll look at the drains, the seams and the rooftop unit curbs and quote in writing.
Yes. That junction is the single most common flat roof leak on Markham houses. It needs proper step flashing and membrane overlap, not caulking — and we fix it as part of any repair to the addition.
Usually, yes. It's a small area, it fails before the main roof, and leaving it means water in the garage ceiling and the wall shared with the house. It's a modest job done on its own.
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