What drives the price
Priced per square foot per inch of depth. Blown fiberglass or cellulose to R-38 is the standard job; the crew, the blowing machine and prep (baffles at the eaves, dams around cans and the hatch) are the labour. In Florida the payoff is real: attic heat is the single biggest load on your AC.
- Current insulation level - topping up vs starting from bare
- Blown-in vs batts vs roof-deck spray foam
- Air sealing before insulating, which is where half the benefit lives
- Old insulation removal if damaged, wet or rodent-contaminated
- Accessibility and roof pitch
Should you DIY this or call a professional?
Blowing machines rent free with insulation purchase, and a competent pair can DIY a simple attic in a day - but the miserable Florida version of that day is real, and pros price this work thinly enough that the DIY saving is modest. What matters more than who blows it: air sealing first (top plates, can lights, chases). Insulation over leaks is a filter, not a barrier.
Signs you need this repair
- AC running continuously on summer afternoons
- Rooms under the attic noticeably hotter
- Joists visible above the existing insulation - under R-19
- Cooling bills climbing year over year
- HVAC ducts in the attic sweating
How to not get overcharged
Ask for the target R-value and the bag count on the quote - bag count is verifiable against the manufacturer's coverage chart, which keeps the depth honest. Ask whether air sealing is included or a line item, and get it. Check your utility for insulation rebates before booking; several Florida utilities pay real money against exactly this job.
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Red flags to watch for
- No R-value or bag count stated
- Spray foam pitched for a house whose problem is two inches of missing blown-in
- Skipping baffles so the new insulation blocks soffit venting
- Insulating over rodent contamination instead of remediating
Frequently asked questions
How much does it cost to insulate an attic?+
Attic insulation typically runs $1,500-$3,500 for blown-in on an average home, averaging near $2,200. Spray foam on the roof deck runs $5,000-$12,000 and is a different decision.
Can I insulate an attic myself, or should I hire a professional?+
Blowing machines rent free with insulation purchase, and a competent pair can DIY a simple attic in a day - but the miserable Florida version of that day is real, and pros price this work thinly enough that the DIY saving is modest. What matters more than who blows it: air sealing first (top plates, can lights, chases). Insulation over leaks is a filter, not a barrier.
How long does it take to insulate an attic?+
Half a Day for Blown-in. Scheduling and parts availability can extend the overall timeline beyond the hands-on work itself.
What makes the price of this job go up or down?+
Current insulation level - topping up vs starting from bare. Blown-in vs batts vs roof-deck spray foam. Air sealing before insulating, which is where half the benefit lives. Old insulation removal if damaged, wet or rodent-contaminated. Accessibility and roof pitch.
How do I avoid being overcharged?+
Ask for the target R-value and the bag count on the quote - bag count is verifiable against the manufacturer's coverage chart, which keeps the depth honest. Ask whether air sealing is included or a line item, and get it. Check your utility for insulation rebates before booking; several Florida utilities pay real money against exactly this job.