Residential Shingle Roof Replacement: What to Expect

When does a shingle roof need to be replaced?

A residential asphalt shingle roof in central Ohio typically lasts 20–30 years, depending on the shingle quality, attic ventilation, exposure, and how well it was installed in the first place. But age alone isn't the only signal. A roof that hits 18 years in great shape may still have life left; a roof that hits 12 years in poor shape needs to come off.

The clearest signs your roof is at or near the end of its service life:

• Age past 20 years for standard 3-tab shingles, 25+ for architectural/laminated shingles
• Granule loss — sandy buildup in gutters, bald patches visible on the roof, granules in the splash zones at downspouts (the National Roofing Contractors Association lists granule loss among the top early indicators of shingle failure)
• Curling, cupping, or clawed edges on individual shingles — the asphalt has dried out and lost flexibility
• Cracked shingles across the field of the roof (not just isolated damage)
• Repeat leaks in the same area despite previous repairs
• Sagging rooflines — structural concern, get inspected immediately
• Moss and algae that won't stay gone after treatment
• Storm damage — wind tears, missing shingles, hail bruising, fallen tree limbs

A single missing shingle or one leaking pipe boot is not a replacement trigger. That's a repair. Replacement makes sense when the assembly is failing, not when one component has a fixable problem.

For a full breakdown of how the system is built and why each layer matters, see our guide to how a residential shingle roof works.

Tear-off vs. overlay: what Ohio code allows

When you replace a shingle roof, there are two paths:

1. Tear-off (full replacement) — Remove everything down to the deck, inspect and repair the sheathing, install all new underlayment, ice and water shield, flashing, and shingles.
2. Overlay (roof recovery) — Install a new layer of shingles directly over the existing layer.

Ohio code allows both — but with strict limits. Per the Ohio Residential Code (Section R908), a roof recover (overlay) is not permitted when:

• The existing roof is water-soaked or has deteriorated to the point it can't serve as a base for new roofing
• The existing roof covering is slate, clay, cement, or asbestos-cement tile
• The existing roof already has two or more layers of roofing covering

That last one is the big one. In Ohio, you cannot legally have more than two layers of shingles on a roof. If your roof already has one overlay (two layers total), the next replacement must be a full tear-off. Many Ohio jurisdictions go further and require tear-off in all cases — Kettering, OH, for example, treats overlay only as an option for homes with one existing layer and sound sheathing.

Why tear-off is almost always the better choice anyway:

• It exposes the deck. Rotten or soft sheathing is invisible under an old shingle layer. Tear-off lets the contractor find and fix it.
• It allows full ice and water shield. Ohio requires ice barrier from the eave to 24 inches inside the exterior wall line (ORC R905.1.2). On an overlay, that barrier is buried under the old shingles and gets nothing.
• All new flashing. Step flashing, chimney counter-flashing, valley metal, drip edge, and pipe boots are leak points. Tear-off replaces them; overlay reuses or skims over them.
• Ventilation correction. If the attic is under-vented (an extremely common Ohio issue), tear-off is when it gets fixed. Overlay leaves it broken.
• Trapped heat. A second shingle layer runs hotter than a single layer, accelerating UV degradation of both layers from above and below. Overlay roofs typically last 15–20 years; tear-off roofs last 20–30+.
• Warranty. Many shingle manufacturers void the full warranty when shingles are installed over existing shingles.

Overlay has one advantage: lower upfront cost. That's it.

The replacement process, step by step

A professional residential tear-off and re-roof in Ohio typically takes 1–3 days for an average home, weather permitting. Here's what happens:

1. Inspection and estimate

A contractor walks the roof (or uses drone imagery), measures it, documents condition, identifies code requirements specific to your jurisdiction, and gives you a written estimate. Get at least three estimates, and make sure each one specifies the same scope so you can compare them honestly.

2. Permit

Most Ohio jurisdictions require a permit for roof replacement. Some smaller municipalities and unincorporated areas don't. The contractor pulls it before work starts — never let a contractor begin without confirming the permit status. An unpermitted reroof can cause problems later when you sell.

3. Material delivery and site protection

Shingles are typically delivered the day before or the morning of tear-off and stored on the driveway or on the roof itself. Tarps go down to protect landscaping, decks, AC units, and pool/patio areas. Magnetic sweepers should be staged for nail cleanup at the end.

4. Tear-off

Old shingles, underlayment, flashing, and pipe boots get stripped down to the bare deck. This is loud and messy — expect debris falling around the perimeter and a dumpster on the driveway. The whole roof is typically stripped in one day on an average home.

5. Deck inspection and repair

With the deck exposed, the contractor inspects every square foot for rot, soft spots, delamination, or damage. Per Ohio code (R905.2.1), asphalt shingles must be fastened to a solidly sheathed deck. Damaged sheathing gets replaced before anything else goes back on. Get the per-sheet cost agreed in writing upfront so this isn't a surprise.

6. Ice and water shield

Ohio requires ice barrier from the eave edge to at least 24 inches inside the exterior wall line (ORC R905.1.2). Quality installers extend it further — in valleys, around skylights and chimneys, around all penetrations. On steep roofs (8:12 or greater), the eave membrane extends 36 inches up the slope.

7. Underlayment

Synthetic or felt underlayment covers the rest of the deck. Per ORC Table 905.1.1, underlayment must conform to ASTM D226, D4869, or D6757. Most quality contractors use synthetic — it's slip-resistant, stronger, and lasts longer if briefly exposed to weather during installation.

8. Drip edge and flashing

New aluminum or galvanized drip edge goes along eaves and rakes. Step flashing, counter-flashing, chimney flashing, and pipe boots are all replaced — not reused. Per ORC R903.2, metal flashing must be at least 0.019 inch thick (No. 26 gauge galvanized).

9. Starter strip

A dedicated starter strip (not cut-up regular shingles) installs along the eave and rake edges. This provides the first sealed course and resists wind uplift along the perimeter.

10. Field shingles

Shingles go on from the eave up to the ridge, course by course. Per ORC R905.2.5, asphalt shingles must have a minimum of four fasteners per strip shingle, and nails must penetrate at least ¾ inch into the deck (or through the deck if the deck is thinner). Wind ratings for Ohio installations should meet or exceed ASTM D7158 Class G/H or ASTM D3161 Class F depending on the design wind speed.

11. Ridge vent and hip/ridge cap

If a ridge vent is being installed or replaced (highly recommended on most Ohio homes — see ventilation section below), it gets cut in and installed before the ridge cap. Hip and ridge shingles cap the peaks.

12. Ventilation balancing

Per ORC R806.2, attic ventilation must meet 1:150 (or 1:300 with proper conditions) net free ventilating area. If your existing ventilation was inadequate, this is when it gets corrected with additional soffit intake, ridge vent, or roof vents.

13. Cleanup and final walk-through

Magnetic sweepers go around the perimeter multiple times to pick up nails. Gutters get cleared of shingle debris. Tarps come down. The contractor should walk the property with you, confirm everything is intact, and provide warranty paperwork.

14. Inspection

If a permit was pulled, the local building inspector visits to verify code compliance before the permit is closed.

What the cost includes — and what it doesn't

Residential shingle roof replacement in Ohio runs roughly $6,000 to $15,000 for a typical single-family home, depending on size, pitch, complexity, shingle grade, and what the deck looks like underneath. That's a wide range because the variables are wide. Specifically:

What drives cost up:

• Steeper pitch (anything 8:12 and above adds labor and safety equipment)
• Multiple layers to tear off
• Rotten sheathing replacement (typically $50–$100 per sheet of plywood)
• Complex rooflines — multiple valleys, dormers, chimneys, skylights
• Higher-grade shingle products (premium architectural, impact-rated, designer profiles)
• Adding or upgrading ventilation
• Skylight replacement at the same time
• Gutter replacement at the same time

What homeowners often miss in estimates:

• Drip edge — code-required (ORC requires drip edge per the OBC), should never be an upcharge
• Ice and water shield coverage area — make sure the bid specifies the full code minimum, not just "along the eaves"
• Flashing — confirm "all new" not "reuse existing"
• Permit fees
• Disposal/dumpster
• Per-sheet deck replacement rate (so you know the rate if rot is found)
• Manufacturer warranty registration — quality installers register the warranty in your name

Shingle grade matters less than installation quality. A premium shingle installed poorly will fail before a mid-grade shingle installed correctly. The biggest single factor in how long your new roof lasts is the workmanship.

Choosing a contractor in Ohio

Ohio does not have a statewide roofing contractor license. Licensing and registration are administered at the county and municipal level, so requirements vary. What to verify before signing anything:

• Local registration — confirm the contractor is registered with your specific city/county building department
• General liability insurance — minimum $1 million coverage, and you should be able to call the insurance company directly to verify it's current
• Workers' compensation — Ohio requires this for employees; a contractor without it leaves you liable if a worker gets injured on your property
• Manufacturer certification — many shingle manufacturers (GAF, Owens Corning, CertainTeed) certify installers; certified contractors can offer extended warranties uncertified ones cannot
• Local references and reviews — request 3+ recent projects you can drive by
• Written contract with full scope, material specs, warranty terms, payment schedule, and start/completion dates
• No large upfront deposit — a small deposit to schedule and order materials is reasonable; demanding full or half payment before work begins is a red flag

The biggest single piece of advice: never sign a contract on a contractor's first visit, especially after a hailstorm. Storm-chasing contractors specifically target homeowners under time pressure. A legitimate contractor will give you a day to decide.

What to expect after the work is done

A new shingle roof should:

• Be inspected and signed off by the local building department (if a permit was pulled)
• Come with both a manufacturer warranty (typically 25–50 years on the shingles, sometimes with full system coverage if installed by a certified contractor) and a workmanship warranty from the installer (typically 5–25 years)
• Be registered with the manufacturer (the contractor does this, but verify it happened)
• Have visible documentation: invoices, permit, warranty, manufacturer materials list

For the first few rains, a small amount of granule wash-off is normal — these are loose granules from the shipping and installation process, not a sign of failure. After the first season, granule loss in gutters should be minimal.

For the first year, watch the attic during heavy rain and after the first freeze. Any signs of leaking, condensation, or ice damming should be reported to the contractor immediately — those are warranty-covered issues, not normal aging.

A properly installed residential shingle roof in Ohio should give you 25 years or more of trouble-free service. Anything significantly less than that is usually traceable to a corner cut during installation — which is why understanding the process matters before the work starts.

This article is informational and reflects code requirements in effect at time of publication. Local jurisdictions in Ohio may have additional amendments. Always verify current code and contractor licensing requirements with your local building department before beginning a roofing project.