Roofing
Roof Replacement Cost in North Alabama: What Moves the Price
Squares, decking, flashing, ventilation and access: what really moves the price of a new roof in North Alabama, and why the cheapest quote often skipped a step.
By the ACM Pros team, Madison, AlabamaUpdated 9 minute read
Quick answer
A new roof in North Alabama is priced by the square, which is one hundred square feet of roof surface, then adjusted for pitch, access and how many old layers come off. What separates one quote from another is what sits under the shingles: decking replacement, flashing and edge metal, and balanced attic ventilation. A full tear-off with a stated rate for rotten decking costs more than a layover, but it is the only way to know what the new roof sits on.
Key takeaways
- Roofs are priced by the square, one hundred square feet of roof surface, adjusted for pitch and access.
- A layover is cheaper but hides the decking; a full tear-off lets the deck be inspected and repaired.
- Decking, flashing and ventilation are the three line items that most often separate quotes.
- Ask for a stated unit rate for rotten decking so the discovery is priced before work starts.
- Many roofs replaced after the April 2011 outbreak are now about fifteen years old and worth inspecting.
- Impact-rated shingles cost more; whether they pay back depends on your exposure and insurance.
How a roof is priced
Roofing is quoted by the square. A square is one hundred square feet of roof surface, not floor area, so a house with a modest footprint can have more squares than you would expect once the slopes, overhangs and porch roofs are counted.
Pitch, meaning how steep the roof is, matters because a steeper roof has more surface than its footprint suggests and is slower and more dangerous to work on. Access matters for the same reason. A roof the crew can reach easily from a driveway goes faster than one over a steep backyard, a pool or a tight gap between houses.
Squares, pitch and access give you a baseline. Everything that makes one quote differ from another sits in what is included beneath the shingles, and that is what the rest of this article covers. There are no dollar figures here, because the only honest number comes from looking at your roof.
Tear-off or layover?
A layover installs new shingles over the existing layer. It is cheaper, and it hides the decking, which is precisely the problem. The decking, also called roof sheathing, is the layer of plywood or board panels the shingles are nailed to. You cannot inspect what you cannot see, and the new roof inherits every defect underneath.
Full tear-off removes the old shingles down to the deck so it can be inspected, repaired where needed and re-fastened. It costs more, and it is the only approach we quote for a roof replacement. If a quote is notably cheap, check whether it is a layover before you assume you found a bargain.
A layover also adds weight to the house, and it means the next replacement has two layers to remove instead of one. If your roof already has two layers, both have to come off, and that is part of why tear-off quotes on older homes vary.
The three line items that separate roofing quotes
Decking
Soft or delaminated sheathing, meaning plywood whose layers have come apart, has to be replaced. Fasteners do not hold in compromised board, and new shingles nailed into it will not stay put. Because nobody can fully assess the deck until the old roof is off, look for a stated unit rate per sheet so the discovery is priced in advance.
We photograph any rotten decking before it is covered, so you can see what was replaced and why.
Flashing and edge metal
Flashing is the metal and membrane that seals the joints where water would otherwise get in. A complete quote names each piece:
- Drip edge, the bent metal strip along the roof's edges that guides water off and away from the wood behind it instead of letting it curl back underneath.
- Valley metal or lining where two roof slopes meet and channel water.
- Step flashing where a roof slope runs up against a wall, woven in with each row of shingles.
- Counter-flashing at chimneys and other masonry, covering the top edge of the step flashing.
- New pipe boots, the rubber-sealed collars around plumbing vents.
A dried-out pipe boot is the single most common leak we are called out to. Reusing old boots to save a little money is a false economy.
Ventilation
Attic heat here is extreme, and it cooks shingles from underneath. A properly vented attic pulls cooler outside air in through intake vents low in the soffits, the underside of the roof overhang, and lets hot air out through exhaust vents at or near the ridge, the peak of the roof. The Asphalt Roofing Manufacturers Association (ARMA) notes that a poorly vented attic can reach 140 degrees on a 90 degree day, and that heat and moisture together can make shingles distort and deteriorate early.
A roof with exhaust and no intake ages measurably faster than the same roof properly vented. ARMA's guidance is that intake should be equal to or greater than exhaust. If a quote adds a ridge vent without saying anything about intake, ask why. Getting roof ventilation right is one of the simplest ways to help a new roof reach its full life.
What else a complete roof quote should name
Beyond those three, a good quote spells out the rest of the system so you can compare like with like:
- Tear-off of every existing layer, and disposal.
- Underlayment, the water-resistant sheet laid over the deck before the shingles go on.
- The starter course, the first row of shingles or starter strip along the eaves, the lower edges of the roof, which seals the bottom edge and helps keep wind from lifting it.
- The shingle itself, named by product line and color.
- Ridge cap shingles and ridge vent, if used.
- All the flashing and edge metal listed above.
- A unit rate for decking replacement.
- Cleanup, including a magnetic sweep of the yard and driveway for nails.
If a line is missing, it is not necessarily left out of the job, but you should ask before you sign rather than after.
Our estimates are written as a line-item scope with the materials named, which makes this comparison easy. For a broader checklist, see how to compare exterior contractor quotes.
Are impact-rated shingles worth it in North Alabama?
This region sits in an active severe weather corridor, with hail and wind storms a regular part of spring. Impact-rated shingles are tested to a higher classification under UL 2218, a lab test in which steel balls are dropped onto the shingles. ARMA explains that products are rated in four classes, with Class 4 the highest level of impact resistance.
They cost more. Whether that pays back depends on how exposed your house is and on your insurance position. ARMA notes that impact ratings may help some homeowners get lower insurance costs from some insurers, so the first call should be to your agent.
Alabama also has a program for stronger roofs. Through Strengthen Alabama Homes, run by the Alabama Department of Insurance, a roof built to the FORTIFIED standard and verified by a certified evaluator earns a certificate that admitted insurers must honor with a discount. Your agent can tell you whether your insurer is one of them. That designation has its own installation and inspection requirements, so a standard replacement does not earn it automatically.
We will price standard and impact-rated shingles side by side and let you decide, rather than assuming.
Repair or replace?
Not every roof that leaks needs replacing. A failed pipe boot, a few wind-damaged shingles or a bad piece of flashing can often be repaired properly. When a repair is what your roof needs, that is what we will quote.
Replacement starts to make more sense when the problems are spread across the whole roof rather than in one spot. Signs worth taking seriously include:
- Granule loss, when the small mineral chips that shield the asphalt from the sun wear away, leaving bare patches and gritty sand in the gutters.
- Shingles that are curling, cupping, cracking or missing in several places.
- A sagging or wavy roofline, which can point to decking trouble.
- Repeated leaks in different places.
- A roof that is at or past the age where its shingles typically start to wear out.
Age alone is not a reason to replace a roof that is still doing its job, and a roof that looks tired from the street is not always failing. An honest inspection tells you which situation you are in.
Why so many roofs around Huntsville are coming due now
On April 27, 2011, a historic outbreak sent 39 tornadoes across the National Weather Service Huntsville forecast area. A large number of roofs across Huntsville and Madison were replaced in a narrow window afterward.
Those roofs are now fourteen or fifteen years in. For architectural shingles, the thicker, layered style common on homes here, that age in this attic-heat climate is where granule loss and mat fatigue start to show. Mat fatigue means the fiberglass core of the shingle is losing strength after years of daily heating and cooling.
If your neighbors are getting new roofs, that is not a coincidence and it is not a sales tactic. It is a group of roofs coming due at the same time. An inspection at that age is worth doing even if the roof looks fine from the ground, because most hail bruising is invisible from there. A bruise is a spot where hail has cracked the mat or knocked granules loose, often too small to notice from the yard.
What changes the price, at a glance
| Factor | Why it matters | What to look for in the quote |
|---|---|---|
| Number of squares | More roof surface means more material and labor | The measured square count |
| Pitch | Steeper roofs have more surface and are slower and riskier to work | A note of the pitch |
| Access | Hard-to-reach roofs take longer to load and work | Any access or staging notes |
| Layers to remove | Each extra layer adds tear-off time and disposal | Tear-off of all layers included |
| Decking | Rotten boards must be replaced before shingles go on | A unit rate per sheet |
| Flashing and edge metal | Joints and edges are where water gets in | Drip edge, valleys, step flashing and new pipe boots named |
| Ventilation | Attic heat shortens shingle life | Both intake and exhaust addressed |
| Shingle type | Impact-rated shingles cost more | Product line named, with standard and impact-rated both priced |
How we price your roof
Our estimates are free and done in person. We come out, look at the roof, measure it and write up a line-item scope with the materials named. There is no pressure to sign, and you are welcome to compare us with anyone.
Once the job starts, one of our two crews stays on it until it is finished, and any rotten decking is photographed before it is covered. You see what was found, what it cost at the agreed rate and why.
Whether your roof went on after 2011 or you have a leak you want looked at, we are happy to help. The ACM Pros is licensed in Alabama (#307601) and insured, and we serve Madison, Huntsville, Harvest and towns across North Alabama. Request your free estimate or call (256) 585-6817, Monday to Saturday, 7 AM to 7 PM.
Questions people ask
Why is roofing quoted by the square?
A square is one hundred square feet of roof surface, not floor area. Pitch matters because a steeper roof has more surface than its footprint suggests and is slower and less safe to work on. Measuring in squares lets every contractor price the same roof on the same basis.
What is the most common hidden cost in a roof replacement?
Decking. It cannot be fully assessed until the old roof is off, so ask for a per-sheet rate up front. A quote with no position on decking is a quote that will change.
Is a roof layover ever a good idea?
We do not quote them. A layover is cheaper because it skips the tear-off, but it hides the deck, adds weight and passes every hidden defect on to the new roof. It also leaves two layers to remove the next time.
How long does a roof last in North Alabama?
It depends on the shingle, the ventilation, the shade and the storms it sees. Hot, poorly vented attics shorten shingle life, and a hail storm can age a roof in an afternoon. Many roofs put on after the 2011 storms are now around fifteen years old and worth an inspection.
Do impact-rated shingles lower insurance costs in Alabama?
They can with some insurers, so ask your agent before choosing. Separately, Alabama requires admitted insurers to give a discount for a roof with a FORTIFIED certificate, which has its own installation and evaluation requirements. We will price standard and impact-rated shingles side by side so you can decide.
Can a leaking roof be repaired instead of replaced?
Often, yes. A dried-out pipe boot, a few damaged shingles or a failed piece of flashing can usually be fixed without a new roof. When a repair is what the roof needs, that is what we quote.
