Sealed, conditioned attics
Attic Encapsulation in New Orleans, LA
Bring the ducts and air handler inside the insulated part of the house.
- Free on-site estimates
- Itemized written quotes with material, depth and R-value
- Under-floor, attic and moisture problems checked first
Why Seal the Attic
Attic encapsulation means moving the insulation from the attic floor to the roofline. Foam goes on the underside of the roof deck and the gable walls, the soffit and ridge vents are closed, and the attic becomes a sealed space close to indoor temperature. In New Orleans, where most ranch homes and many older houses have the air handler and ductwork in the attic, this changes how hard the system has to work.
The problem it solves
A vented attic in a New Orleans summer can run 130F or hotter. Ducts in that heat gain heat through their insulation, and every leaky joint pulls hot, wet attic air into the system or pushes cooled air out. Sealing the attic floor and adding fill protects the rooms below, but the ducts are still in the oven. Encapsulation puts them in mild air.
What changes
Once the attic is sealed it is part of the house, so its humidity matters. Your HVAC company may suggest a small supply of conditioned air or a dehumidifier in the attic. Gas appliances in the attic need their combustion air checked. Exhaust fans have to vent outside, not into the attic. We go over all of this before work starts and note it on the quote.
Foam choice
Open-cell foam is the common choice under roof decks here. It is less costly per inch, fills deep rafters and lets a roof leak show through from below so it can be found. Closed-cell adds more R-value per inch where rafters are shallow. The Department of Energy suggests R-49 to R-60 for an attic in zone 2; at the roofline, foam thickness is chosen to balance that against cost and rafter depth, and we write the thickness and R-value down.
When encapsulation is not the right call
If there are no ducts or equipment in the attic, sealing the attic floor and blowing loose fill to depth usually costs less and works well. If the roof is near the end of its life, it may make sense to reroof first. We tell you if either applies. HomeGuide lists roof deck foam at $1,500 to $9,000 and attic floor foam at $1,100 to $6,800, so the choice matters. Get a free estimate
Parts of an Attic Encapsulation
What a typical sealed-attic job includes.
Roof deck foam
Open-cell or closed-cell sprayed to the underside of the sheathing.
Gable walls
Foam on the end walls so the attic is sealed on all sides.
Vent closure
Soffit, ridge and gable vents sealed off.
Penetrations
Flues, plumbing vents and wiring sealed where they pass through.
Old insulation on the floor
Left in place or removed, depending on condition and the plan.
Published Attic 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) |
Sources: HomeGuide's January 2026 attic guide and Fixr's 2025 spray foam guide. Roof size and pitch, access, foam thickness and removal of old material set your total. Our written estimate is what you pay.
How an Encapsulation Goes
1. Attic check
Roof condition, leaks, ducts, gas appliances, fans and wiring.
2. Plan with you
Encapsulate or insulate the floor; humidity plan noted.
3. Prep
Cover the attic floor, close vents, protect the house below.
4. Spray
Foam the deck and gables to the planned thickness.
5. Review
Walk through, photos, notes for your HVAC company.
Why Choose Us for Attic Encapsulation
Both options priced
We show floor insulation and encapsulation side by side when both fit.
Humidity planned
We flag what your HVAC company should look at.
Roof checked first
Leaks are found before foam covers the deck.
Attic Encapsulation Questions
Will a sealed attic make my roof shingles too hot?
Shingles on a foamed deck run a little warmer. Some shingle makers have rules about unvented roofs, so check your warranty paperwork. We can give you the foam type and thickness to ask them.
Do I still need attic ventilation?
No, a sealed attic is unvented by design. It does need humidity managed, often with a small air supply or dehumidifier.
Can you encapsulate an attic with old insulation on the floor?
Yes. Clean, dry fill can stay. Wet, moldy or rodent-fouled material should come out.
How long does an attic encapsulation take?
Most homes take one to two days plus curing time. Plan to be out for at least 24 hours.
Attic Encapsulation Service Areas
- Spray Foam Insulation in New Orleans, LA
- Spray Foam Insulation in Metairie, LA
- Spray Foam Insulation in Kenner, LA
- Spray Foam Insulation in Harahan, LA
- Spray Foam Insulation in River Ridge, LA
- Spray Foam Insulation in Jefferson, LA
- Spray Foam Insulation in Gretna, LA
- Spray Foam Insulation in Terrytown, LA
- Spray Foam Insulation in Harvey, LA
- Spray Foam Insulation in Marrero, LA
- Spray Foam Insulation in Westwego, LA
- Spray Foam Insulation in Belle Chasse, LA
- Spray Foam Insulation in Chalmette, LA
- Spray Foam Insulation in Arabi, LA
- Spray Foam Insulation in Slidell, LA
- Spray Foam Insulation in Destrehan, LA
Get an Attic Encapsulation Estimate
Ducts in the attic? Ask us to look and price a sealed attic.