Guttrz / Roofing / Overlay vs tear-off
Roof overlay vs tear-off in Ohio: which should you choose?
Roofing by Guttrz installs tear-off replacements only, inspected and quoted by the owner, so this page gives you the honest case for and against an overlay before you decide.
A roof overlay puts a second layer of shingles over the first and saves the cost of tear-off and disposal, commonly quoted at 15 to 25 percent of the job. A tear-off strips to the deck, replaces rotten wood, and adds ice and water shield and underlayment that an overlay cannot. Ohio's residential code, based on the IRC, allows at most two layers, so a roof with two already must be torn off. Roofing by Guttrz in North Canton, Ohio installs tear-off replacements only, with a free owner-inspected roof inspection and one flat written quote good for one year.
Roof overlay vs tear-off in Ohio is a real choice on a roof with one layer of shingles and no choice at all on a roof with two. An overlay nails new shingles over the old ones and skips the tear-off, the dumpster, and much of the labor. A tear-off strips the roof to the wood deck and rebuilds every layer. Both are allowed on a single-layer roof under Ohio's residential code. Roofing by Guttrz installs tear-off replacements only, and the reasons are at the end, after an honest look at both.
What is a roof overlay?
A roof overlay, also called a nail-over or second layer, is a new layer of asphalt shingles installed directly on top of the existing one. The old shingles stay. The installer flattens or cuts back curled tabs, nails the new shingles through the old layer into the deck, and reuses or works around the existing flashing. There is no new underlayment and no new ice and water shield, because both have to go on bare deck. New drip edge and pipe boots are usually possible.
A tear-off removes every old shingle, the old underlayment, and the old flashing, exposes the deck so soft plywood can be replaced, then rebuilds the roof from the deck up. That is the system described on the Roofing by Guttrz hub.
How many layers of shingles are allowed in Ohio?
Two. Ohio homes fall under the Residential Code of Ohio, which is based on the International Residential Code, and the IRC's reroofing section does not allow a new roof covering over a roof that already has two or more layers of any kind. So one existing layer can take an overlay, and two existing layers must come off. Local building departments in the area print the same rule in their reroof permit guides, the City of Medina among them.
The same code section blocks an overlay in two other cases even on a single layer: when the existing roof or deck is water-soaked or so deteriorated it will not hold new shingles, and when the existing roof is wood shake, slate, clay or asbestos-cement tile. Most reroofs in Stark County need a permit from the city or township building department, and the application usually asks how many layers are on the roof now. Guttrz pulls the permit where one is required.
Roof overlay vs tear-off in Ohio: how do they compare?
The cost line is a market range from national cost guides, not a Guttrz price.
| Factor | Overlay (second layer) | Tear-off |
|---|---|---|
| Up-front cost | Commonly quoted at 15 to 25 percent less than a tear-off on the same roof | Full price; see roof replacement cost |
| Time on the roof | Usually shorter, often one day | One to two days for an average home |
| What gets inspected | Nothing under the old shingles | Every square foot of deck |
| Ice and water shield | Cannot be added | New at eaves, valleys and penetrations |
| Underlayment | None added | New synthetic underlayment |
| Weight on the framing | Roughly double the shingle load | One layer |
| Manufacturer warranty | Often reduced or conditional; read the shingle maker's terms | Full warranty on a clean deck |
| Expected life | Often several years shorter than the same shingle on a clean deck | Full rated life |
| Next replacement | Must be a two-layer tear-off, which costs more | One layer to remove |
| Resale | Home inspectors note two layers; buyers often ask for a credit | Nothing to flag |
Why does weight matter on an overlay?
A layer of asphalt shingles weighs about 200 to 250 pounds per square for 3-tab and about 300 to 450 pounds per square for architectural shingles, where a square is 100 square feet. An average 25-square roof taking a second layer of architectural shingles picks up roughly 4 to 5 tons it did not carry before. Roof framing here is designed for snow, and the Akron-Canton area averages about 47 inches a season, so most houses carry a second layer without trouble. The concern is older homes with undersized rafters, roofs that already sag, and roofs where ice dams pile up at the eaves every winter, because the overlay adds load exactly where the ice already does.
What does an overlay hide?
Decking rot, the biggest argument against an overlay in a freeze-thaw climate. Around here the deck fails first at the eaves from ice dams, in valleys, around chimneys and pipes, and under any north slope where oak and maple shade has let moss hold water against the shingles for years. None of that is visible from the top of an old roof. A tear-off finds soft plywood and replaces it. An overlay nails new shingles into it, and a few years later the nails lose their grip, shingles slide, and the leak that was there all along shows up inside the house.
An overlay also telegraphs. Every curl, hump, and missing tab in the old layer shows through the new one, and the new shingles never lie quite flat, which is where wind gets under them. And it cannot fix a ventilation problem, because the deck stays covered.
How does an overlay affect warranty and resale?
Shingle manufacturers write their warranties around installation on a clean deck with their own underlayment and starter. Many limit or shorten the warranty when shingles go over an existing layer. Read the manufacturer's terms before you agree to an overlay. On resale, home inspectors routinely count layers at the rake edge and write two layers into the report. Buyers read that as a roof that will cost more to replace, and they often negotiate for it. A second layer saves money today and gives some of it back at closing.
When is a roof overlay a reasonable choice?
An overlay is a fair choice when all of these are true: the roof has exactly one layer; the existing shingles lie flat with no curling, cupping, or bald spots; the deck is sound, which you can check from the attic for stains, soft spots, and daylight; the roof has never had an ice dam leak; the design is simple with few valleys and penetrations; and you plan to sell within about 10 years. In that case the overlay buys a dry roof for less, and the next owner handles the two-layer tear-off.
An overlay is the wrong choice when the roof already has two layers, when there is any history of leaks or ice dams, when the roofline sags, when the current shingles are curled, or when you plan to stay in the house for the life of the new roof. Then it costs less now and more later.
Why does Guttrz install tear-off only?
Because the things that make a Northeast Ohio roof fail early are all under the shingles, and a tear-off is the only way to see and fix them. Every Guttrz replacement starts by stripping the old shingles to the deck. Soft decking is replaced. Then ice and water shield goes down at the eaves and valleys, which code requires in our climate and which an overlay cannot add. Synthetic underlayment, drip edge, starter strip, architectural shingles, and ridge vent follow. A dumpster takes the old roof away and the yard gets a magnet sweep for nails. Most homes are done in one day. You get a manufacturer warranty on the shingles and a written Guttrz workmanship warranty, terms on your quote.
If you want an overlay, we are not the right fit, and we will say so at the inspection. If you are not sure the roof needs anything yet, roof repair vs replacement covers that call. And because the drip edge of a new roof laps into the gutter, a tear-off is the natural time to replace sagging gutters with seamless gutters; roof and gutter replacement explains how both go on the same week.
Not sure how many layers are on your roof? Start with a free roof inspection. The owner inspects the roof himself and sends a photo report with a Good, Watch, or Replace Soon rating, plus one flat written quote good for one year if it needs replacing. Now booking spring 2027 roof replacements. Free roof inspections now. You can book a free roof inspection in North Canton with the form on this page, or text (330) 818-5584.
Questions
Is it OK to put new shingles over old shingles?
It is allowed in Ohio on a roof with one existing layer that lies flat on a sound deck. Whether it is a good idea depends on what is under the old shingles, which you cannot see. If the roof has ever leaked at the eaves or valleys, if the roofline sags, or if the shingles are curled, the overlay will be nailing new material into problems that stay hidden until they fail.
How long does a roof overlay last?
Usually several years less than the same shingle installed on a clean deck. The second layer sits on an uneven surface, runs hotter because the old layer holds heat, and skips the underlayment that backs up the shingles when wind drives rain under them. Many installers put an architectural overlay at 15 to 20 years in the Midwest instead of 25 to 30, and some manufacturers shorten the warranty to match.
Can you put architectural shingles over 3-tab shingles?
Yes, and it is the most common overlay because 3-tab shingles are thin and flat, so the new layer lies reasonably well. The installer needs longer nails to reach through both layers into the deck. Architectural over architectural is a poor combination, because the thick, staggered old layer telegraphs through the new one and the new shingles never seal flat.
Do you need a permit to overlay a roof in Ohio?
In most Stark County cities and townships, yes, for an overlay or a tear-off, and the application asks how many layers are on the roof now. Permit rules are set by each city or township building department, so check with yours before work starts. An unpermitted overlay can also come up on a home inspection when you sell.
How do I know how many layers of shingles are on my roof?
Look at the edge of the roof at the gable or rake end, where the shingles end against the drip edge. Each layer shows as a separate stacked edge, so two layers look about twice as thick as one. From a ladder at the eave, lift the bottom course and count the shingle edges underneath. The attic does not tell you, because you are looking at the deck, not the shingles.
Can ice and water shield be added during an overlay?
No. Ice and water shield is a self-adhering membrane that bonds to the bare deck at the eaves, valleys and penetrations, and it only works there. In Northeast Ohio code requires it at the eaves because January averages 25 degrees or colder, extending at least 24 inches inside the exterior wall line. An overlay keeps whatever the original roof had, or did not have, under the old shingles.
Keep reading
Written by Christian Schaffner, owner of Guttrz. Updated November 7, 2026.
Where we install
Get your quote
Six quick steps. We send you a price range within the hour.