Twenty minutes of walking around your own house is the only inspection that matters, and almost nobody does it.
That is the whole confession. People research shingle brands for a month, argue over three bids, hand over a check, wave at the crew on the way out, and never once look up. Then a year later a stain shows on the ceiling and everyone acts surprised. The final walkthrough is where you either protect what you paid for or lose the chance. This is that walkthrough, in order, done the way I would do it if a crew had just left my driveway.
Here is the short version: drip edge, valleys, ventilation, visible fasteners, decking, and cleanup. Six checks. Each one takes minutes. Together they cover nearly everything that goes wrong after a tear off.
Start on the ground, not on the roof
Walk the whole perimeter before you climb anything. Stand back far enough to see the roofline against the sky. That line should read as one straight, even edge. If it dips, waves, or sags in one spot, ask why before you sign anything.
Then look down. You are looking for two things: shingle scraps and nails. A crew that sweeps with a magnetic roller leaves almost nothing. A crew that does not leaves flats in your driveway and a nail in your kid’s bike tire, and a flat tire is the cheap version of that story. Untreated decking also matters here, since rot in the roof structure is one of the most commonly flagged issues in older American housing, a pattern the Department of Housing and Urban Development tracks closely in its housing condition reporting.
Do this check in daylight, not evening. Metal fragments hide in grass once the light goes flat.
What does a properly finished edge actually look like?
The drip edge is the metal strip that runs along the eaves and rakes. It should sit under the underlayment at the eaves and over it at the rakes. If that sounds backward, that is exactly the point. Contractors mix those up more than you’d guess, and the consequence shows up as rot at the fascia two winters later.
Run your eyes along the gutter line. The metal should be tight, straight, and free of gaps where it meets the gutter. Any visible gap is a place water will find on a windy day. In western Washington it does not need to be a storm. It just needs to be a Tuesday in November.
Then check the fascia boards themselves. If old shingles were laid over a rotted edge and nobody replaced it, the wood under your new roof is already compromised. A good crew flags this during tear off and shows you photos. If nobody showed you photos, ask.
Valleys and penetrations: where leaks actually begin
Valleys are the interior angles where two roof planes meet, and they take more water per square foot than any other part of your house. Look for a clean, uniform line running the full length. You do not want to see shingles crossing the valley in a woven pattern if the proposal promised a metal valley, or vice versa. Match what you see against what you signed.
Penetrations are the smaller stuff: vent pipes, furnace flues, skylights. Each one should have proper flashing and a sealant line that looks freshly tooled, not smeared. If the sealant looks like it was thrown on with a spoon, that is a sign of a rushed afternoon, and rushed afternoons are where callbacks come from.
Ventilation deserves its own look. Ridge vents should be continuous and unblocked. Intake vents at the soffit should be visible from below. Balanced intake and exhaust keeps attic temperatures and moisture in a healthy range, and building science research from the National Institute of Standards and Technology has long documented how moisture behavior inside building envelopes drives long term durability. Your roof is part of an assembly. It does not work alone.
Decking, fasteners, and the stuff you can only see from the attic
Go inside. Grab a flashlight. Find the attic access and look at the underside of the new roof.
You are checking for daylight coming through the sheathing and for dark stains on the rafters. A little daylight at a ridge vent is normal. Daylight through a field of shingles is not. Then look at the nails poking through the deck. They should be driven straight and sunk to the surface, without hammer blows that crushed the wood around them.
If your home is in an area with a history of seismic activity, the way the roof is fastened to the structure is worth a direct question. A home that got a full replacement is a rare chance to fix weak connections, and it is the kind of upgrade nobody thinks about until after an earthquake, which is a bad time to think about it.
The checklist I’d hand a homeowner
Print this or copy it into your phone. Run it the same day the crew leaves, while the site is still fresh in everyone’s memory.
- Roofline reads straight from the street on all four sides.
- Magnetic sweep completed, no nails in the lawn, driveway, or planting beds.
- Drip edge tight along eaves and rakes, no gaps at the gutter.
- Valleys match the agreed method and run clean and uniform.
- All penetrations flashed, sealant freshly tooled.
- Ridge and soffit vents both open and unobstructed.
- Attic shows no unexplained daylight and no new staining.
- Gutters clear of granules and scraps.
- Leftover materials and old shingles hauled away, not stacked behind the shed.
- Warranty paperwork and manufacturer registration in hand.
Snap photos of anything odd. Photos create a timeline, and a timeline is what you’ll need if a question comes up in month eight.
Why local knowledge beats a national checklist
Roofing in the Puget Sound region runs on a different calendar than roofing in Phoenix. Moss, pine needles, standing moisture, and short dry windows all change what a good install looks like. Crews here plan around rain the way other crews plan around heat, which means scheduling slips and material staging get more complicated, and shortcuts show up in the details rather than the big picture.
This is also why a genuinely local crew tends to hold up better on a callback. Someone who has spent years working the same few dozen square miles knows which neighborhoods have tree cover, which ones get wind off the water, and which ones have forty year old decking that needs replacing before anything goes on top. If you are in the south end of the lake and comparing bids from companies that also work the north end, make sure the crew doing the work is the crew that knows your block. Homeowners comparing estimates in the area often start by narrowing to roofing renton specialists rather than firms driving in from an hour away, and that instinct is sound for reasons that have nothing to do with marketing.
Ask two questions of any bidder. How many roofs did you finish in this zip code last year? And who is on site on day one? Vague answers to either one tell you plenty.
One more thing about timing
Do not schedule the walkthrough for the same hour the trucks are pulling out. Crews are tired, you’re excited, and nobody is paying attention. Wait until the next morning, walk it alone with coffee, then send your notes in one message. Written notes get answered. Verbal concerns whispered at the curb do not.
You’re not being difficult. You’re closing the loop on the largest single line item most homeowners ever put on a house, and the people who do this well for a living expect exactly that from you.
So the question isn’t whether your new roof looks nice from the street. It’s whether you’ve stood in your own attic with a flashlight and checked. That’s the one that counts.
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