Your shingles might look fine from the outside — but if the roof substrate underneath is damaged, soft, or rotting, your entire roofing system is at risk. The substrate is the base layer (usually plywood or OSB sheathing) that supports your shingles, underlayment, and waterproofing system. If it’s weak or compromised, no roofing material on top will perform the way it should.
At Do It Right Roofing, we specialize in roof substrate inspection, repair, and full replacement throughout Toronto and the GTA. Whether you’ve had a long-term leak, are dealing with mold or sagging, or are replacing your roof entirely, we make sure your structure is solid from the ground up.
Our team removes the guesswork. We fully inspect the decking, identify water-damaged or warped areas, and replace them with high-quality materials — ensuring your new roof has a safe, durable, and code-compliant base.
Your roof substrate is the foundation layer that your underlayment, shingles, and ventilation are attached to. When it’s in good shape, your roof stays strong, straight, and secure. But if it’s damaged — from moisture intrusion, old age, or improper installation — it can lead to:
Roof leaks that keep coming back
Soft or springy sections in the roof
Sagging lines or visible dips
Mold or mildew in the attic
Shortened lifespan of your roofing system
Unfortunately, many roofing contractors skip proper substrate inspection or just build over problems. We don’t. If the deck is compromised, we’ll fix it properly — so your roof has a solid base that lasts.
