What We Find When the Old Roof Comes Off

Royal Dane Roofing · Salt Lake City, UT · From the roof

What We Actually Find When the Old Roof Comes Off

There is a moment on every tear-off, about forty minutes in, where the shovels get down to bare wood and everybody on the crew goes quiet for a second. That is when you find out what you really bought. Up to that point, every roofer who walked your property was reading the outside of a sealed box. Once the shingles are in the dumpster, the box is open.

I want to talk honestly about that moment, because it is the source of almost every bad feeling homeowners have about roofing contractors. Somebody gets a number, work starts, and then a guy in a harness is standing on their driveway explaining that the price went up. Sometimes he is being straight with them. Sometimes he is not, and from the ground it is very hard to tell the difference. After ten years on roofs and three running my own shop, here is what is genuinely hidden until the shingles come off, and how you can tell which one you are dealing with.

The Deck Is the Part Nobody Bid On

Your shingles are a wear layer. The structure that matters is the plywood underneath and the underlayment between them. When I walk a roof before a job I can tell you a fair amount by feel. Soft spots underfoot, a springy stretch between rafters, waviness along a valley line, all of that reads through the shingles. What I cannot tell you is how many sheets are bad, because a sheet can be sound where I am standing and delaminated eighteen inches over.

Delamination is the sneaky one. Plywood is layers of veneer glued in alternating grain. Get it wet repeatedly and the glue lines let go, and the sheet turns into a stack of loose plies that still looks like plywood from above. It will hold a shovel and a boot. It will not hold a nail. Drive a fastener into it and you get zero grip, which means the shingle above it is attached to nothing.

Actual rot is easier to spot but usually worse when you find it: dark, soft enough to push a screwdriver through, and almost always downhill of whatever was leaking. Water does not stay where it enters. It runs along the top of the felt, hits a seam or a nail, and drops through somewhere else entirely, which is why the stain in your bedroom is rarely under the actual failure point. OSB is different again. When it takes on water the strands swell and it never comes back to full thickness, so every sheet edge telegraphs through the new shingles.

Where the Damage Hides on Salt Lake Houses

Chimneys are first on my list every time. A masonry chimney moves at a different rate than the wood framing around it, so the joint between them is under constant stress. If the original flashing was face-nailed and caulked instead of counter-flashed into a cut reglet, that joint has been taking water for years. The wood on the uphill side, where snow piles and sits, is the most common rot I find.

Valleys are second. All the water from two roof planes funnels into one line, so a valley carries several times the volume of open field. If the metal was skimped, or it was a woven shingle valley worn through at the center, the deck under it has been taking a river every storm. Valley rot runs as a long stripe, often a full sheet or two.

Pipe penetrations are third. Vent boots with rubber collars crack from UV and typically fail in the fifteen to twenty year range, well before the shingles are done. Small hole, slow drip, so it can go on for a decade before anyone notices. By then the sheathing around the pipe is a soft ring.

Fourth are low-slope tie-ins, everywhere on the mid-century ranch homes in this valley. A porch roof or an addition at a shallow pitch running into the main roof asks shingles to do a job they are not built for. Snow sits on it and water backs up at the transition. Half the time the builder ran regular shingles onto a pitch that should have had a membrane, and the deck under that section is the worst wood on the house. Those areas need a different approach, which is why we handle them as low-slope work.

Last, older homes here frequently have spaced sheathing, one-by boards with gaps between them, or full-dimension boards cupped and shrunk apart over eighty years. That was normal construction for wood shake. It is a real problem for modern architectural shingles, which need continuous support across the whole plane. When I open one of those up, the conversation is about whether we overlay the whole thing in new sheathing.

What Honest Handling of the Unknown Looks Like

Here is the thing nobody in this trade likes to say out loud. A roofing bid contains a known part and an unknown part. The tear-off, the underlayment, the shingles, the flashing, the vents, the labor, the dump fees, all of it can be measured from the ground. The deck cannot. Anyone who tells you they know exactly how many sheets are bad before the shingles come off is telling you a story.

There are only three ways a contractor can handle that. He can pad the bid heavily so whatever he finds is already covered, which means you pay for rot you may not have. He can quote it thin to win the job and come at you mid-project when you have no roof and no room to argue, which is the one that produces the horror stories. Or he can name a clear unit rate for decking in writing before anything gets torn off, so if we find nothing you pay nothing extra, and nobody is negotiating on a driveway.

The third one is what we do. The rate is on the paperwork before the first shovel goes in. No invented line item, no vague “additional carpentry,” no charge that cannot be traced to a specific piece of wood we pulled off your house. And you get to see it. Every sheet we replace gets photographed in place before it comes out, and if you are home I would rather walk you up and show you right then. The old wood stays on site until you have seen it. That habit removes basically every argument this trade is known for.

What a Good Deck Should Look Like When We Are Done

Sheathing should be continuous, solid, and thick enough to hold a fastener. When we replace a sheet it gets cut to land on rafter centers so both edges are supported, not floating in the middle of a bay with a butt joint hanging in air. Panels get a small gap at the edges so the wood can move seasonally without buckling, which matters here given how far our temperatures swing.

Fastening is where a lot of corner-cutting happens because it is invisible five minutes later. Sheathing gets nailed on a proper pattern along the edges and through the field, into every rafter it crosses. On the shingle side the nails go in the manufacturer’s nail zone, driven flush, not overdriven so the head cuts the mat and not underdriven so it stands proud. On the IKO systems we install that pattern is what makes the wind rating mean anything. A shingle that pulls off in a canyon wind event almost always goes because of how it was nailed.

Then everything gets protected properly. Ice and water shield at the eaves, run far enough up the slope to sit past the exterior wall line, plus in the valleys and around every penetration. Synthetic underlayment across the field. New flashing at every wall and chimney rather than the bent piece that came off. New pipe boots, always, because a fifteen-year-old boot on a thirty-year roof makes no sense.

Sometimes the honest answer after the tear-off is that we are re-decking the whole plane. That is not an upsell, that is a house that has been quietly failing for a long time. I will tell you why in plain language and show you the wood, and if you want to think about it overnight we will dry it in and give you the night. That process is laid out on the roof replacement page.

Why This Matters More on a Small Crew

I left a company where I was doing everything, hiring, firing, collecting checks, running the jobs, and went out on my own to provide for my family. That means I am not sending a salesman to your house and a subcontractor to your roof who have never met. I am the one up there when the deck gets opened up. The person who quoted the job is the person looking at the wet plywood, so nobody has to relay anything and nobody has an incentive to shade the story.

Being smaller is the reason that works. I am not the biggest outfit on the Wasatch Front and I do not need to be. At this size every job matters and there is no volume to hide a bad one behind.

If you are collecting bids right now, ask each one a straight question: what is your rate for replacing a sheet of decking, and will you show me every sheet before you pull it. The answer, and how fast it comes, tells you most of what you need to know. You can also just look at the work. Our gallery is all jobs we did ourselves, no borrowed photos.

When you are ready to have somebody actually get on the roof and look, reach out and we will set it up. No pressure, no pitch about a discount expiring tonight.

Quick Answers

Why can you not tell me the decking cost up front?

Because I would be making it up. There is no tool that sees through shingles and felt to grade the plywood underneath. What I can do is give you the rate per sheet in writing before we start, so the only variable is the count and you already know the math. If everything is solid, you pay for zero sheets.

Can you roof over the existing shingles instead of tearing off?

It can be done in some cases and I generally advise against it. Layering over means nobody inspects the deck, so any rot or delamination stays and the new roof gets nailed into compromised wood. It adds weight, traps heat, makes future repairs harder, and usually shortens the life of the new shingles. The only thing it reliably saves is the tear-off.

What actually drives the price of a roof?

Pitch is a big one, since steeper roofs slow everything down and change how we stage and tie off. Square footage and complexity matter, meaning how many valleys, dormers, and penetrations we detail. Existing layers change tear-off and disposal. Access matters. Then material choice and deck condition. All of that gets measured on your specific house.

How long does a typical residential tear-off and replacement take?

Most straightforward single-family roofs in this valley are a one to two day job, weather permitting. Complex roofs with cut-up planes, steep pitch, or significant deck replacement stretch longer. We do not leave a house open overnight. If we cannot finish, it gets dried in with underlayment before we leave, every time.

What if a storm caused the damage rather than age?

Then the tear-off tells a different story and documentation matters more. Hail bruising, wind creasing along tab edges, and lifted courses leave marks an adjuster recognizes, and those are easier to argue with dated photos taken before anything is removed. Start with the storm damage page and call us before anyone removes evidence.