Spray foam insulation done right. Columbus closed-cell specialists.

Most Central Ohio jobs are priced by the board foot: roughly $1.50-$2.50 for closed-cell and $0.50-$1.20 for open-cell. A basement rim joist runs $800-$2,200, an attic $2,800-$8,500, and a whole-house envelope $12,000-$22,000.

Three things move a Columbus number more than anything else. First, which surface: the band joist in a Whitehall ranch basement is a few hundred board feet, while the underside of the roof deck on a Dublin two-story with a bonus room can run to several thousand. Second, which foam: closed-cell costs roughly twice as much per board foot but delivers about twice the R-value per inch, so the gap narrows wherever depth is limited. Third, prep: pulling decades of loose fill out of an Upper Arlington attic, installing baffles, or opening a knee wall is priced separately from the spray itself. A written quote should state board feet, thickness, and product for each surface so two bids can be compared line by line. The quote comparison checklist walks through that, and the calculator gives a first range before anyone visits.

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Per inch, closed-cell foam delivers about R-6 to R-7, open-cell about R-3.5 to R-3.8, blown cellulose about R-3.2 to R-3.8, and fiberglass batts roughly R-3 to R-3.7. The bigger difference is that foam also stops air, which batts and loose fill do not.

The number printed on a bag measures conductive heat flow through the material in a lab with no air moving through it. Houses do not behave that way. Air slips around the edges of batts, through the gaps at wires and pipes, and straight through loose fill that has not been dense-packed, and in a Columbus winter that moving air carries heat out faster than conduction does. Spray foam bonds to the framing and sheathing and fills those gaps as it expands, so the rated R-value and the delivered R-value stay close together. That matters most where space is tight and air pressure is high: a 2x4 wall, the band joist above a basement, a knee wall behind a bonus room, a cathedral ceiling framed with 2x8 rafters. In a wide-open attic with room for 16 inches of material, blown cellulose over an air-sealed ceiling reaches the Ohio code value of R-49 for less money, which is why the right answer is usually a mix rather than one product.

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Not federally. The Section 25C credit for insulation and air sealing ended for work placed in service after December 31, 2025. In Central Ohio the help left in 2026 is income-qualified: Columbia Gas WarmChoice, AEP Ohio HELP, and the state weatherization program.

The IRS treats a home improvement as placed in service when the original installation is completed, so a job that wrapped up in January 2026 does not qualify even if it was signed and paid for in 2025. For 2026 and later work, the money-back paths in Franklin, Delaware, Licking, Fairfield, and Union counties are narrow. Columbia Gas of Ohio has ended its general residential efficiency programs but still offers no-cost weatherization through WarmChoice for customers at or below 200 percent of the Federal Poverty Guidelines. AEP Ohio runs the High Efficiency for Low-income Program for households at or below 300 percent of the guidelines, though it paused applications for 2026 and plans to reopen them for 2027 program assistance. The Home Weatherization Assistance Program, applied for through energyhelp.ohio.gov or a local community action agency, also uses the 200 percent line. Keep an itemized invoice regardless; if a future credit appears, that paperwork is what qualifies you. Each program is broken down in utility help for Columbus insulation.

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Cured polyurethane foam does not settle, slump, or lose its shape, so a correct install lasts as long as the framing it is bonded to. What shortens its life is sunlight, repeated wetting, or a bad install, not age.

Foam is a thermoset plastic: once the two components react, the result does not soften or break back down at household temperatures. That turns the lifespan question into a question about the conditions around it. Exposed to ultraviolet light, the surface yellows and crumbles over time, which is why exterior foam needs a coating and why foam left bare near a sunny pole barn gable or skylight should be covered. Soaked again and again by a roof leak or a wet crawl space, open-cell foam holds water against the wood it touches. Foam mixed off-ratio never finishes curing, which is a day-one defect rather than an aging problem. In Central Ohio the practical long-term threats are a roof that starts leaking years later above an unvented deck and a crawl space whose drainage fails; both are maintenance items, not foam failures. Material warranties and workmanship warranties are separate documents, and both belong in the closeout package.

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It depends on where the house starts. Energy Star estimates sealing and insulating saves an average 15 percent on heating and cooling. Drafty pre-war Columbus homes often beat that; a newer house already built to the Ohio blower door limit usually saves less.

The Energy Star figure comes from modeling a typical 1970s or 1980s house with about a quarter of its air leakage sealed and insulation brought up to a modern code level, averaged across the country. Central Ohio pushes that number both ways. The Residential Code of Ohio design table lists about 5,660 heating degree days a year for Columbus against 4,410 for Cincinnati, so winter air leakage costs more here, and a drafty Clintonville foursquare or a Whitehall ranch with a bare rim joist tends to land above the average. A house built under the 2019 Residential Code of Ohio already had to test at or below 5 air changes per hour at 50 pascals, so it has less to gain. The honest way to estimate your own savings is to compare 12 months of Columbia Gas and AEP Ohio usage (therms and kilowatt-hours, not dollars) and a blower door number before and after the work. The diagnosis tool helps you read the symptoms first.

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A basement rim joist is usually a half day and a typical attic one day. Walls, crawl spaces, and jobs covering several surfaces run two to three days, plus any removal of old insulation beforehand and a cure period before anyone moves back in.

The spraying is the quick part. Setting up the truck-mounted proportioner, masking, and bringing the drums to temperature take the first hour or two, and closed-cell goes on in passes with a pause between them so heat from the reaction does not build up. Removing old insulation, which is common in Upper Arlington and Clintonville attics filled with decades of loose fill, is often a separate day. Winter adds time in Central Ohio: an unheated attic or crawl space on a January morning can sit below the product minimum surface temperature, so the space is warmed first instead of sprayed on schedule with a poor cure as the result. Plan for the household to be out of the home during spraying and for the manufacturer re-entry window afterward, commonly 24 hours. See staying home during the install for the details.

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Plan to be out. People and pets should leave during spraying and stay away for the manufacturer re-entry period, commonly around 24 hours for residential work, while the space is ventilated.

The concern during application is airborne isocyanate, which OSHA identifies as a cause of occupational asthma and of eye, nose, throat, and skin irritation. Applicators wear respiratory protection for that reason; occupants have none, so the practical rule is simple: leave, and come back only after the written re-entry time for that specific product has passed with ventilation running. For a rim joist job in a Worthington basement, many households plan to be away for the day and the night. For a full attic, or a crawl space connected to the air handler, the heating and cooling system is usually shut down and its openings sealed during spraying so it cannot pull vapor through the house. Ask for the re-entry time in writing before the job and ask how the space will be ventilated. A fishy odor that lingers after the re-entry window is not normal and should be reported; why people remove spray foam explains what it means.

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If ductwork or a furnace sits in the attic, foam the underside of the roof deck so that equipment ends up inside the insulated space. If the attic holds nothing but framing, air-seal the attic floor and insulate there.

Many Central Ohio two-stories built from the 1990s on, especially in Dublin, Powell, Lewis Center, and Westerville, have a second-floor air handler or flex duct running through the attic. Insulating the floor beneath that equipment leaves it working in a space that can fall toward the 5 degree Columbus winter design temperature, so every duct leak becomes a direct loss. Moving the insulation up to the roof deck creates an unvented attic, which the Residential Code of Ohio permits under section 806.5 with conditions, including foam in direct contact with the sheathing and, in Climate Zone 5, a Class II vapor retarder rating. If the attic has no mechanical equipment, the floor is cheaper: seal the top plates, wire holes, and fixture boxes, then build depth to R-49 with foam or blown fill. The roof deck moisture FAQ covers what keeps the roof deck approach safe here.

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