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We tear the old roof all the way down to the wood, every time. Laying new shingles over old ones hides whatever is rotting underneath, traps heat that ages the roof early, and gives you a lumpy surface that voids the strong manufacturer warranties. A full tear-off lets us inspect and repair the deck, lay fresh underlayment, and build the roof as one clean system. North Carolina also caps a roof at two layers, so for many homes a tear-off is the only legal option anyway.
The Shortcut We Refuse to Take
I am Marcus Bell, and I want to explain a decision that costs us a little more on every job and is worth every penny: we never roof over. When you replace a roof with Summit & Oak, the old shingles come off, all of them, down to the bare wood deck.
There is a cheaper way, and you will be offered it by somebody. Roofing over means nailing a new layer of shingles right on top of the old ones. It is faster, it skips the disposal fee, and it lets a low bidder come in under everyone else. It also buries every problem the old roof was hiding and builds your new roof on a foundation nobody actually looked at. That is the trade I am not willing to make with your home.
You Cannot Fix Wood You Never See
The deck, also called the sheathing, is the layer of wood the shingles are nailed into. It is the bones of the roof. And here is the catch: until the old shingles come off, no one on earth can see what shape it is in.
On a lot of older Triangle homes, when we strip the roof we find boards that are soft, rotted, or stained from a slow leak that was quietly working for years. You cannot nail a sound new roof into bad wood and expect it to hold. When you roof over, that rot stays right where it is, sealed in under a fresh layer that looks great for a few seasons and then starts to fail from the wood out. A tear-off is the only way we can find those boards, replace them, and give your new roof something solid to grab.
- Rotted or water-stained decking is common and invisible until tear-off
- New nails will not hold properly in soft or rotted wood
- A roof-over seals existing rot in to keep spreading underneath
- We replace bad boards at a clear per-sheet price so the base is solid
Underlayment, Heat, and a Roof That Lasts
A roof is a layered system, and the layer you never see does a lot of the work. Underlayment is the protective sheet that goes down over the deck, under the shingles, as a second line of defense against water. A roof-over leaves the old, tired underlayment in place and skips this entirely.
There is a heat problem too. Two layers of shingles hold far more heat than one, and in our North Carolina summers that extra heat bakes the shingles from below and shortens their life. You end up with a roof that cost less to install and wears out years earlier, which is the opposite of a good deal. Stripping to the deck lets us lay fresh underlayment, build the system the way the manufacturer designed it, and give you the full life you are paying for.
Warranty Integrity Is the Quiet Reason
This is the part that does not show up until you need it, which is exactly when it matters most. The strong manufacturer warranties, the ones that actually protect you for decades, generally require the roof to be installed over a clean deck with the full system in place. Lay shingles over an old layer and you can void that coverage before the first rain.
As a GAF Master Elite contractor, we can register the stronger warranties that come with a properly built roof, but only when the roof is built to the standard those warranties demand. A roof-over does not meet it. So the shortcut does not just risk an early failure, it can quietly strip away the very protection that would have covered you. Doing the tear-off keeps your warranty intact and real.
And in North Carolina, the Law Has a Say
Even setting aside everything above, there is a hard limit. North Carolina building code caps a roof at two layers of shingles. If your home already has two, a roof-over is not just a bad idea, it is not allowed, and the only legal path is a full tear-off.
So for a great many homes the decision is already made. But even on a single-layer roof where a roof-over would technically be legal, we still strip it. The reasons do not change just because the law would let us cut the corner. If you want to dig deeper into the difference, our guide on tear-off versus roofing over walks through it, and our roof replacement guide covers how the whole project comes together. When you are ready, a documented inspection tells you exactly what your deck and layers look like before any work starts.