Roof Valley Repair in Toronto & the GTA

Valleys are where two roof slopes funnel their water into one channel, which means a valley handles several times the water of any other spot on your roof — and takes the ice first every winter. So valleys wear out before the rest of the roof does. A valley leak often shows up while the surrounding shingles still have years left, and homeowners understandably wonder whether the whole roof is done. Usually it isn't.

How the repair goes depends on how your valley was built. An open valley — exposed metal down the centre — can often have the metal replaced and the adjacent shingles relaid. A closed valley, where shingles weave or lap across the channel, has to be opened up: shingles out a couple of feet each side, ice and water membrane down, then new metal or properly lapped shingles over it. The membrane matters here more than anywhere; the Ontario Building Code expects eaves protection for good reason, and valleys collect ice the same way eaves do.

We quote a valley replacement as its own job, not a roof replacement in disguise. If your valley leak is really a valley problem, fixing that channel buys the rest of the roof its full remaining life. If the shingles feeding the valley are themselves at end of life, we'll show you that in photos and let you decide with real information rather than pressure.

• Removal of shingles along both sides of the valley, wide enough to rebuild the detail properly
• Tear-out of the old valley metal or worn-through woven shingles down to the deck
• Repair of any soft or rotted decking exposed in the valley channel
• Ice and water shield membrane laid the full length of the valley before anything goes over it
• New valley metal — or a properly cut closed valley where that matches the roof — lapped to shed downhill
• Reinstallation of shingles along the valley with correct trimming and no fasteners in the water channel
• Tie-in at the top and bottom of the valley, where most poorly-done valley repairs fail
• Cleanup and a photo record of the layers before they were covered

• Valley length and how many valleys need work — many GTA houses have two or four, and doing them together saves setup
• Open versus closed construction, since converting or rebuilding a closed valley takes more shingle work
• Decking condition underneath; a long-leaking valley usually has some rot to cut out
• Metal choice and gauge, from standard galvanized to longer-lived options
• Pitch and access, because valleys sit between slopes and steep intersections need careful staging
• How well replacement shingles can be matched and interlaced with what's staying

Every home is different, so we don’t publish flat prices — the quote is free and based on your actual job.