Frequently Asked Questions

No. Spraying releases isocyanate vapors, so the work area is closed off and ventilated, and you, children and pets should be out of the house while foam goes in. The EPA notes that some manufacturers recommend about 24 hours after application before re-occupancy, but times vary by product, thickness, temperature and humidity. We give you the manufacturer's re-entry time in writing before the job.

HomeGuide's 2026 guide puts 1,000 square feet of sprayed surface at about $1,500 to $5,000, with open-cell at the low end and closed-cell at the high end. Fixr's range for existing homes is higher, $3,150 to $7,500. Depth, foam type and access move the price. We give a written number after measuring.

Using HomeGuide's per-inch figures, 4 inches of open-cell foam is about R-14 to R-15, and 4 inches of closed-cell is about R-20 to R-28, depending on the product. Check the manufacturer's data sheet for the exact foam being installed; we list it on the quote.

Homeyou's Richmond figure, based on customer reports for about 1,282 square feet, is roughly $1,981 to $2,477. National guides show wider ranges: HomeGuide lists attics at $3,000 to $8,000 and whole houses at $8,000 to $20,000. Many companies also have minimum job charges of $1,000 or more. Your written estimate is the price.

It depends on the attic. If you want to move the HVAC equipment and ducts inside the insulated space, foam on the underside of the roof deck makes sense. For a standard vented attic with nothing in it, air sealing plus blown-in fiberglass or cellulose on the floor usually costs less for the same comfort. We show both options when both fit.

The City of Richmond's homeowner permit guide says permits are required for alterations and repairs, with exceptions in the code, and lists an insulation inspection before concealment for permitted work. It does not address insulation-only jobs directly. We check with the city or county building office for your address before scheduling.

Dominion's Home Energy Evaluation program lists insulation and air sealing among the upgrades that can earn rebates after a Comprehensive Home Energy Audit by a participating contractor. Its page does not give dollar amounts. Check the current rules with Dominion before starting work.

It depends on the product. The EPA says some manufacturers recommend about 24 hours for professional two-component systems, and curing changes with thickness, temperature and humidity. We give you the manufacturer's re-entry time in writing before the job.

Both can work under a roof deck. Open-cell costs less and fills irregular spaces; closed-cell reaches a higher R-value in less depth and resists moisture. We recommend one based on rafter depth, roofing and budget, and explain why on the quote.

Foam on the roof deck can hide a leak until the wood is damaged, so we check the roof first. Some shingle manufacturers have specific terms for unvented roof assemblies; check your roofing warranty before deciding.

It is often worth it where air leaks are hard to reach or moisture matters: rim joists, crawl space walls, bonus rooms and attics holding ductwork. On a plain attic floor, air sealing and blown-in insulation usually give similar results for less.

The Department of Energy recommends R-60 for an uninsulated attic in Climate Zone 4, or adding R-49 if you already have 3 to 4 inches. For blown-in insulation that usually means well over a foot, often 14 to 20 inches or more, depending on the material and the product's coverage chart.

Usually, if the old insulation is dry, clean and free of pests and vermiculite. If it is wet, moldy or full of droppings, it should come out first. We tell you which at the inspection.

For a vented attic with nothing in it, air sealing plus blown-in is usually the better value. If your ductwork or air handler is in the attic, spray foam on the roof deck keeps that equipment out of summer attic heat.

A typical air sealing and blown-in job on a single-family home is often done in a day. Spray foam at the roofline takes longer, plus the manufacturer's re-entry time.

Building Science Corporation recommends against venting crawl spaces to the outside, because humid summer air brings moisture in. A sealed crawl space needs a ground cover, sealed vents, wall insulation and humidity control working together.

HomeGuide's 2026 guide lists $3,000 to $15,000 on average, or about $3 to $10 per square foot. A vapor barrier alone runs about $1,200 to $4,000. We quote each part separately after an inspection.

A sealed crawl space needs some way to control humidity. That can be a dehumidifier or a small supply of conditioned air from the house, depending on the layout and HVAC system.

Batts between the floor joists absorb moisture from humid air, get heavy and pull away. Replacing them with the same thing often repeats the problem; sealing the space and insulating the walls avoids it.

For most vented attic floors, yes. It is usually the lowest cost way to reach the R-49 to R-60 range recommended for Climate Zone 4, especially combined with air sealing.

Yes, some. Manufacturers list both installed and settled depths on their coverage charts, and we install to the depth that gives the target R-value after settling.

Usually, if the old layer is dry, clean and not vermiculite. If it is wet, moldy or contaminated, we recommend removing it first.

Air sealing and blowing a typical attic is often a one-day job. Unlike spray foam, there is no re-entry wait, though the attic is dusty while we work.

Yes. Dense-pack cellulose or fiberglass is blown in through small holes, from inside or from outside under the siding, and the holes are patched. Inside patches need paint afterward.

For closed walls, dense-pack is usually the practical choice. For open framing during a remodel, spray foam gives more air sealing and R-value per inch, at a higher price.

Knob-and-tube wiring should be checked by an electrician before walls are filled. We will not insulate around live knob-and-tube wiring.

HomeGuide lists blown-in exterior wall insulation at about $1,900 to $7,800 total. Spray foam in all exterior walls runs about $4,000 to $10,000. We quote after looking inside the walls.

Not usually. If the old insulation is dry, clean and not vermiculite, new insulation can go on top. Removal makes sense for wet, moldy, rodent-soiled or smoke-damaged material.

HomeAdvisor lists $1 to $2 per square foot, with most projects around $600 to $1,200. Spray foam and contaminated material cost more to remove.

Leave it undisturbed and have it tested. The EPA advises against disturbing or sampling suspected asbestos yourself. If it contains asbestos, removal is done by licensed abatement professionals.

Vacuum removal sends the material through a hose straight to bags outside, and we cover the path through the house. Expect dust in the attic itself, not in the living space.