Frequently Asked Questions

It depends on where the air handler and ducts are. With equipment in the attic, open-cell spray foam on the roof deck often makes the most difference. With the air handler indoors, sealing the ceiling and blowing cellulose or fiberglass to R-38 or more is usually the better value. Closed-cell suits metal buildings and tight spaces.

HomeGuide's 2026 guide lists closed-cell at $3.00 to $5.00 per square foot installed, compared with $1.50 to $3.50 for open-cell. The thickness on your quote drives the final number.

Several chemical companies make two-part open-cell and closed-cell systems. We name the product on your quote and can share its data sheet with the R-value per inch and barrier requirements.

HomeGuide's whole-house spray foam range is $8,000 to $20,000, and Fixr's is $10,000 to $30,000. A 2,000 square foot house has more than 2,000 square feet of roof and wall surface, so the total depends on what gets insulated. Doing only the attic with blown-in costs far less.

The 2023 Florida Building Code, Energy Conservation, lists R-38 for ceilings in Climate Zone 2, which includes Palm Beach County. ENERGY STAR recommends R-49 for an uninsulated Zone 2 attic.

FPL lists an instant $220 ceiling insulation rebate when existing insulation is below R-8 and the installer is an FPL-approved participating contractor. Check eligibility with FPL.

HomeGuide advises at least 24 hours while the foam cures. We ventilate the area and give you a time to return.

Where the air handler and ducts are in the attic, foam on the roof deck often helps a lot. Where they are not, a sealed ceiling with blown-in may be the better buy.

It cuts the humid outdoor and attic air that leaks into the house, which lowers the moisture load on the AC.

It can slow how fast a leak shows inside, which is why we check the roof first. Open-cell lets moisture pass, so leaks usually show as damp spots on the foam.

At HomeGuide's R-3.5 to R-3.7 per inch, about 5.5 inches of open-cell reaches roughly R-20. The quote lists the inches for each area.

Yes, when done right: dry roof deck, enough foam and vents properly closed. It keeps humid outdoor air out of the attic where the ducts are.

Reroofing is a great time, because the new deck is clean and dry. Talk to us about timing.

Some roofing manufacturers have published positions on foam under roof decks. Check your roofing paperwork first.

Usually one to two days of spraying, plus curing time.

Florida's code lists R-38 for Zone 2 ceilings; ENERGY STAR recommends R-49 starting from an uninsulated attic.

It still helps, and costs less than roof deck foam. If the ducts are long and leaky, a sealed attic may help more.

Yes, if it is dry and clean.

FPL's program requires existing insulation below R-8 and an FPL-approved contractor. Check with FPL.

Heat from the garage rises through the ceiling and gaps around pipes and ducts. Closed-cell foam under the floor helps.

Yes, closed-cell on the underside of the steel roof and walls.

Once cured, yes. Animals need to be out during spraying and curing.

In occupied or attached spaces the code usually requires a thermal barrier. We note it on the quote.

Standard spray foam needs open cavities. For closed walls, injection foam or dense-pack are options, but in block homes the options are limited.

When drywall is off, closed-cell foam in the furring space bonds to the block and adds R-value.

Florida's 2023 code lists R-13 for frame walls and R-6 or R-4 continuous for mass walls in Zone 2.

Yes. We schedule between rough-in and drywall.

Ceiling stains, a musty smell or matted insulation near roof repairs are signs. We can check.

Usually, once the rats are gone and entry points are sealed.

The material leaves through a hose, and we cover the route.

Only if the old material is dry and clean.