Cut the heat from above
Attic Insulation & Air Sealing in Biloxi, MS
The attic is where Gulf Coast houses take the most heat.
- Free on-site estimates
- Written quote with material, thickness and R-value for every area
- Leaks, moisture and termite inspection access checked before we spray
Where Summer Gets In
Attic insulation and air sealing is the first upgrade for most Coast homes. A sun-baked roof turns the attic into the hottest space on the property, and thin insulation lets that heat radiate down into the rooms below. Gaps around light fixtures, ceiling fans, plumbing stacks, the attic hatch and the tops of interior walls let hot attic air leak straight in.
Seal, then insulate
We seal those gaps first with foam and caulk, weatherstrip and insulate the hatch or pull-down stairs, and then blow in cellulose or fiberglass to depth. ENERGY STAR suggests R-49 for an uninsulated Zone 2 attic, or R-38 added over 3 to 4 inches. With blown fiberglass around R-2.2 to R-2.9 per inch and cellulose R-3.1 to R-3.8 (HomeGuide), that is over a foot of loose fill.
Ducts in the attic
Most local homes run ductwork through the attic. Leaky duct joints lose cooled air into the attic and pull hot air in. Sealing the ducts helps either way. If the ducts are extensive, foaming the roof deck instead can bring them inside the conditioned space.
Ventilation
A vented attic needs open soffits. We install baffles before insulation reaches the eaves.
Storm damage
After a roof leak or storm, wet insulation should come out. We check for stains and damp before adding anything.
Radiant barriers
Some Coast homes have a radiant barrier under the roof deck. It reduces radiant heat from the roof, but it does not replace insulation or air sealing on the attic floor. We work with what is there.
When the ceiling needs repair
If ceiling drywall has sagged or stained from past leaks, it should be fixed before insulation is added. We point out what we see.
Comparing quotes
Ask each insulation company for the same lines: air sealing, insulation material, depth and target R-value. Those numbers make bids comparable.
What an Attic Job Includes
Sealing, insulation and duct details.
Ceiling air sealing
Top plates, fixtures, stacks and chases sealed.
Hatch and attic stairs
Weatherstripped and insulated.
Baffles
Keep soffits open for ventilation.
Blown-in to depth
Cellulose or fiberglass to the agreed R-value.
Roof deck option
Foam under the roof where ducts fill the attic.
Published Attic Insulation & Air Sealing Costs
| Job | Range and source |
|---|---|
| Attic insulation, average job | $1,000 to $2,700, about $1,800 average (HomeGuide) |
| Air sealing | $350 to $3,000 (HomeGuide) |
| Blown-in, attic | $0.90 to $2.40 per sq ft (HomeGuide attic guide) |
| Spray foam on the attic floor | $1,100 to $6,800 (HomeGuide) |
| Spray foam on the roof deck | $1,500 to $9,000 (HomeGuide) |
| Spray foam, attic (existing home) | $2,500 to $12,000 (Fixr) |
| Old insulation removal | $1 to $2 per sq ft (HomeGuide) |
Ranges come from HomeGuide's January 2026 attic guide and Fixr (2025). Sealing needed, depth, access and any removal change the price. Your written estimate is your price.
How We Handle an Attic
1. Inspect
Depth, bypasses, ducts, ventilation, leaks.
2. Quote
Sealing, insulation and any duct work as separate lines.
3. Seal
Bypasses, hatch and baffles.
4. Insulate
Blow in to depth or spray the roof deck.
Why Choose Us for Attic Insulation & Air Sealing
Ducts considered
Duct location shapes the recommendation.
Depth markers
You can check the depth.
Separate lines
Sealing and insulation priced separately.
Attic Insulation & Air Sealing Questions
How much attic insulation do I need in Biloxi?
ENERGY STAR suggests R-49 for an uninsulated Zone 2 attic, or adding R-38 over 3 to 4 inches.
Is blown-in or foam better for my attic?
If ducts are not in the attic, sealed and blown-in is usually the better value. If they are, roof-deck foam may be worth it.
Does a radiant barrier replace insulation?
No. It can reduce radiant heat but does not replace insulation or air sealing.
How long does an attic job take?
Usually a day for sealing and blowing in.
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Get an Attic Insulation & Air Sealing Estimate
Tell us how hot the upstairs gets. We will check the attic and ducts and quote it.