A home inspector's report will say something like "Roof: asphalt shingles, age approximately 10–15 years, appeared in serviceable condition." That tells you almost nothing. A home inspector spends maybe 5 minutes on the roof, usually from a ladder at the eave. They're checking a hundred other things in the house.
A buyer in Brampton asked us to do a dedicated roof and attic inspection on a house they were about to close on. The home inspector had said the roof was fine. It was not fine.
What 45 minutes found
On the roof surface: The shingles were 12 years old — consistent with the listing. Granule loss was moderate on the south-facing slope, heavier than expected for 12 years. We found lifted shingles around the chimney flashing and a soft spot in the decking about 2 feet from the chimney base. The chimney counter flashing was pulling away from the mortar.
In the attic: This was the real finding. The attic had two passive roof vents and no ridge vent. For a house this size — about 1,400 sq ft of attic floor — building code recommends 1 square foot of ventilation per 150 square feet of attic space, split between intake (soffit) and exhaust (ridge or roof vents). This attic had about 40% of the required ventilation.
The result: the attic was noticeably warm even in April. Insulation was compressed in several areas. There was visible moisture staining on the underside of the decking at the ridge — classic sign of inadequate ventilation causing condensation buildup in winter.
What it meant for the buyer
The roof itself had maybe 5–7 years of usable life remaining with a focused repair around the chimney area. That's not unreasonable for a 12-year-old architectural shingle roof in the GTA. The buyer could plan for a replacement around year 18–20.
But the ventilation issue was accelerating the roof's aging. Insufficient attic ventilation traps heat in summer (baking the shingles from below) and traps moisture in winter (causing condensation that degrades the decking). If the ventilation wasn't addressed, that 5–7 year estimate would drop to 3–4.
What the buyer did with the report
We provided a written report with photos: current condition, estimated remaining life, the ventilation deficiency, and approximate costs to address each issue. The chimney flashing repair and the decking soft spot: modest cost. Adding a ridge vent and improving soffit intake during the eventual re-roof: part of the normal replacement cost. Doing the ventilation work now as a standalone job: a few hundred dollars.
The buyer's agent used our report to negotiate $3,000 off the purchase price — covering the immediate chimney repair, the ventilation improvement, and part of the future re-roof cost. The seller's home inspector report had noted none of this.
Why dedicated roof inspections matter
Home inspectors are generalists. They're looking at the furnace, the plumbing, the electrical, the foundation, and the roof — all in 2–3 hours. They'll catch obvious failures: missing shingles, active leaks, sagging rooflines. They won't catch the things that cost you money 3 years later.
A dedicated roof inspection includes:
- •Walking the full roof surface, not just viewing from the eave
- •Checking every flashing point — chimney, vents, walls, valleys
- •Probing for soft decking
- •Full attic inspection for ventilation, insulation, and moisture signs
- •Estimated remaining lifespan based on Ontario-specific wear patterns
When to get one
Before buying a home — especially if the roof is over 10 years old. A $250 inspection that reveals a $15,000 replacement need in 3 years is the best money you'll spend in the buying process.
Before your roof warranty expires — if your roof is approaching the end of its manufacturer warranty, an inspection can document any warranty-eligible defects before the coverage lapses.
After a major storm — if you're filing an insurance claim, a documented inspection from a licensed roofer carries more weight than phone photos.
The Brampton buyer spent $250 and saved $3,000 on the purchase price. More importantly, they knew exactly what they were buying and when the next expense was coming. No surprises. That's the point.