Roof Inspection Checklist for Thunder Bay Home Buyers

The roof is one of the most expensive things on a house, and it is the one a typical home inspection covers least well. By the time you find out a Thunder Bay home needs a new roof, you have signed, closed, moved in, and seen your first February ice dam come through the kitchen ceiling. This is a checklist to use before you close, and a guide to when it is worth paying a roofer for an independent look.

The short version: ask the right questions of the seller and agent, know what to scan for during the showing, and understand what the home inspector is not going to catch. For a high-stakes purchase, an independent roofing inspection is cheap insurance.

Why the Roof Matters More in Thunder Bay

Up here a failing roof is not just a leak. The same neglected roof in milder Ontario might cost you a few years of slow degradation. In Thunder Bay it costs you ice dams, rotted decking at the eaves, attic moisture, mould, and eventually drywall damage on the second floor, all in one bad winter. The damage compounds fast.

That changes the math on inspection. A roof at end of life on a house you are buying is a real negotiation point. A roof that looks fine but is hiding a ventilation problem will hit you in your first winter. You want to know which one you are buying.

Before You Tour: Ask the Listing Agent

A serious buyer gets these answered before the showing. Most agents have the answers ready.

• How old is the current roofing? Not the house, the roof. A re-roof done in 2008 on a 1955 house is what matters. Get the year.
• What material is it? Asphalt 3-tab, architectural, metal, flat membrane. Different lifespans, different inspection priorities.
• Replaced or layered over? A “replaced” roof can mean tear-off-and-replace, or a second layer of shingles over the first. A two-layer roof has shorter remaining life and the next re-roof costs more.
• Receipts and documentation? A real re-roof generates paperwork (manufacturer warranty registration, workmanship warranty, invoice). The absence of paperwork on a recent re-roof is itself a flag.
• Is the warranty transferable? Some manufacturer warranties transfer on sale, some require a fee and a short notification window. Workmanship warranties vary. More on what these warranties actually cover in our warranty guide.
• Has there been a leak? A direct, written question. The seller’s property information statement usually has a roof leak history question; check it.
• Have ice dams been an issue? In Thunder Bay this should be standard. Recurring ice dams tell you something about the attic and the eaves.

At the Showing: From the Ground

You are not going on the roof. You are going to look hard from the ground while you are walking around the house.

Look for Sag

Stand at the corner of the house and sight down the roofline. Then do the same at the opposite corner. The roof should be straight. Any visible dip or wave in the ridge or between rafters is a structural concern. Same for visible bowing in the eaves.

Scan the Shingles

From the ground:

• Are the shingles all there? Missing tabs, lifted edges, bare patches.
• Do they look uniform? Patches in a different colour or visibly different age suggest past repairs.
• Are they curling, cupping, or buckling? All end-of-life signs.
• Are they shedding granules? Look for dark patches and look in the eavestrough.

Check the Eaves

The eaves take the most damage from ice. Look for:

• Staining or wear along the lowest line of shingles
• Damaged or sagging eavestrough
• Rotted, painted-over, or replaced fascia wood
• Stained or rotted soffit under the overhang

A patched-up eave on a Thunder Bay house often means past ice damming.

Check Flashing and Penetrations

From the ground, look at:

• Chimney flashing for signs of rust, lifted edges, or visible sealant patches
• Plumbing stack boots (the rubber boots around vent pipes) for cracking
• Skylights for fogging between panes or visible flashing problems

Look for Multiple Layers

This is hard to confirm from the ground, but here is a clue: if the shingle edge at the eave looks thicker than a single shingle, or if there is a visible step where the roof meets a low addition, the roof may have been layered.

Look at the Soffits

Walk under the overhang. The soffit panels should have ventilated sections (you can see slots or perforations). If the soffit is all solid with no ventilation, the attic is not getting fresh air. That is a big issue in our climate. More on this in our ventilation guide.

What a General Home Inspection Often Misses

The standard home inspection in Ontario is a visual, non-invasive overview. A good general inspector looks at the roof from the ground and sometimes a ladder, and notes major visible problems. What they often miss: whether intake and exhaust ventilation is actually balanced, whether ice-and-water membrane is present (they cannot tell from outside), the real condition of the decking, manufacturer-specific issues like defective product lines or installers no longer in business, hail strikes and other storm damage signs that take training to spot, and whether the roof is genuinely near end of life rather than just “appears serviceable.” It is the scope of their job, not a knock on inspectors. On a high-value purchase, an independent roofing inspection fills the gap.

A roofer’s inspection is worth it if the roof is more than ten years old without documentation, if you spotted anything during the walk-around that concerns you, if the home inspector flagged the roof for further evaluation, if the home is older (1970s and earlier) and the ventilation has likely never been updated, if you are buying in a high-snow area like rural Oliver Paipoonge, Neebing, or up the Shuniah shore, or if a roof failure in year two would stretch the budget.

Our roof inspection service covers this. We walk the roof, look in the attic, photograph everything, and give you a written assessment with remaining life estimate and issues to negotiate. The cost is a small fraction of what a missed roof problem can cost.

Red Flags That Should Slow You Down

Some patterns we see often enough to call out:

• Recently re-roofed without documentation. Why no paperwork on a job that was supposed to be done?
• Asphalt over asphalt. Two layers is a real cost issue for the next re-roof.
• Mixed-age repairs all over the roof. A roof that has been patched in multiple places by different hands, none documented, is hard to assess and probably nearing end of life.
• Heat cables along every eave. A sign of chronic ice damming that the previous owner band-aided rather than fixed. The underlying ventilation problem is still there. See our eavestrough and ice dam article.
• Fresh paint on the soffit and fascia. Sometimes legitimate. Sometimes covering rot.
• A new tarp on part of the roof. Active leak, not yet repaired.
• Stain ceilings on the second floor or in upstairs closets. Past or current leaks.

Any one of these is worth a closer look. Several together is a serious flag.

What to Do With What You Find

If the inspection finds the roof is in good shape, great. You bought it knowing what you have, and the closing goes smoothly.

If the inspection finds problems, you have options:

• Negotiate price down by the cost of the work, with quotes to back it up
• Make the closing conditional on the seller addressing it, with documented work
• Walk away if it is bad enough and you have a financing condition

What you should not do is close on a roof problem you have not properly priced. “We will deal with it later” on a Thunder Bay roof at end of life often turns into a five-figure surprise within twelve months.

A Quick Note for Sellers

If you are on the other side and selling a home with a roof past its prime, a documented roofing inspection up front actually helps you. You disclose what you have, you avoid the buyer using “unknown roof condition” to negotiate hard, and you have control over which roofer’s report is in front of the buyer. Many sellers find the cost is recovered in a smoother close. Worth considering. See our decision guide on repair vs replace if you are weighing pre-listing roof work.

The Takeaway

A roof problem caught before closing is a negotiation. A roof problem caught after closing is a bill. Use the checklist above on every showing, ask the right questions, and on any home where the roof is the question mark, commission a roofer’s inspection before you sign. It is the cheapest line in the entire transaction.

Considering a home and want a real roof assessment before you close? Call Sleeping Giant Roofing at (807) 501-9192 or book an inspection. We do pre-purchase inspections across Thunder Bay and Northwestern Ontario.