Roof Repair in Don Mills

A localized membrane repair, a reseated penetration, or a seam reseal typically runs $350 to $2,000 depending on the extent and the access. Where ponding has undermined a larger section the number rises because the substrate has to come out rather than being covered over. We quote after establishing how far the moisture has travelled.

Because water under a membrane travels sideways until it finds a route through the deck, and that route can be metres from where it entered. This is the single most common reason repairs on these roofs fail: somebody patched above the stain rather than at the entry point. We trace before touching anything.

Yes, and it is the most common underlying issue we find here. Standing water accelerates membrane degradation, adds load, and softens the substrate beneath. Where the ponding is caused by inadequate fall rather than a blocked drain, no patch will hold, and the honest answer is that the slope needs correcting before a membrane will last.

Some can and many cannot, and the difference shows up two years later rather than immediately. Membrane work needs heat welding on some systems, correct primer and adhesion on others, and detailing at penetrations that has no equivalent in shingle work. We would rather you asked any contractor what membrane systems they are certified on before hiring them.

Always, itemized and after the diagnosis rather than before it. On a membrane roof the estimate also states what we found about the condition of the surrounding system, because that determines whether a repair is a sensible investment or a way of deferring a replacement by a season.

Yes, on every job as standard: dated photographs before and after, the failure described by mechanism, and the materials used. On a flat roof that record matters more than usual, because the visible damage is so often remote from the cause and an adjuster will otherwise draw the wrong conclusion.