Cool the rooms under a hot roof
Attic Air Sealing & Insulation in Montgomery, AL
Seal the leaks first, then insulate to a real R-value target.
- Free in-person estimates
- Written quote that lists material, thickness and R-value for each area
- Moisture, ductwork and pest damage checked before anything gets covered
The Attic Sets the Summer Temperature Upstairs
Attic air sealing and insulation is usually where a Montgomery comfort problem starts and ends. On a July afternoon with the outdoor high in the 90s, the space under a dark shingle roof can run far hotter than outside. Any gap in the ceiling below lets that heat and humidity into the house, and any duct running through the attic loses cooling on its way to the rooms.
Seal first
Air sealing closes the holes between the attic and the living space: openings around plumbing vents, flues, wiring, recessed lights, bath fans, the top plates of interior walls, dropped soffits over kitchen cabinets and the attic hatch or pull-down stairs. Insulation laid over those gaps without sealing them still lets air through. We use foam, caulk and fire-rated materials where required, then insulate.
Then insulate to a target
Alabama's amended energy code lists R-30 for ceilings in new homes in Zone 3. The Department of Energy recommends more for retrofits: R-49 to R-60 for an attic with no insulation, or adding R-38 to R-49 over 3 to 4 inches already in place. Many older ranch houses around Montgomery have a few inches of settled fiberglass or cellulose. Topping that up to depth after sealing is often the most cost-effective comfort upgrade in the house.
When to foam the roof deck instead
If the attic holds the air handler and most of the ductwork, insulating the attic floor leaves all of that equipment outside the insulation in the hottest part of the house. Spraying foam on the underside of the roof deck and sealing the gable and soffit vents brings the attic inside the conditioned envelope, so the ducts run in a space close to room temperature. It costs more, and it changes how the attic works, so we explain ventilation, gas appliances and roof inspection before recommending it.
What This Covers
Attic work we quote around Montgomery:
Attic bypass sealing
Gaps at plumbing, wiring, flues, top plates, light fixtures and soffits sealed with foam and caulk.
Blown-in top-up
Cellulose or fiberglass blown over the sealed attic floor to the target R-value, with depth markers.
Spray foam roof deck
Open-cell or closed-cell foam under the roof to bring ducts and equipment inside the insulated space.
Hatch and pull-down stair covers
Insulated, weatherstripped covers for attic openings, a common leak.
Kneewalls and bonus rooms
Sealing and insulating the walls and floors around rooms that sit beside or over attic space.
Published Attic Insulation 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 from HomeGuide's January 2026 attic guide and Fixr's 2025 spray foam guide. How much sealing the attic needs, the depth, access and any removal change the total. We price your attic in person, and the amount on the written estimate is what you pay.
How Attic Work Goes
1. Attic inspection
We measure existing depth, look for leaks, roof stains, pests and duct problems, and note where the air handler sits.
2. Choose floor or roof deck
We explain whether sealing and topping up the floor or foaming the roof deck fits your house, with prices for each when both work.
3. Seal the bypasses
Every reachable gap between the attic and the rooms below gets sealed before new insulation goes in.
4. Insulate and verify
We blow or spray to the planned depth, mark it, and show you the finished attic.
Attic Air Sealing & Insulation Questions
How much attic insulation do I need in Montgomery?
The state's amended code lists R-30 for new-home ceilings in Zone 3, and the Department of Energy recommends R-49 to R-60 for an uninsulated Zone 3 attic. For blown cellulose or fiberglass that usually means well over a foot of depth. We quote to a stated R-value so you can check it.
Is a radiant barrier enough on its own?
A radiant barrier reduces heat radiating from the roof, but it does not stop air leaking from the attic into the house and it is not a replacement for insulation depth. Sealing and proper insulation come first.
Will more insulation help my upstairs bonus room?
Often the problem is the kneewalls and the floor between the room and the attic, not the main attic floor. Those spots need sealing and insulation of their own, which is why we look at the room from both sides.
Do I have to remove the old insulation?
Not if it is dry and clean. Old insulation that is wet, moldy or full of rodent droppings should come out, and sometimes it has to come out so we can reach the leaks underneath.
Attic Air Sealing & Insulation Service Areas
- Spray Foam Insulation in Montgomery, AL
- Spray Foam Insulation in Prattville, AL
- Spray Foam Insulation in Millbrook, AL
- Spray Foam Insulation in Wetumpka, AL
- Spray Foam Insulation in Pike Road, AL
- Spray Foam Insulation in Tallassee, AL
- Spray Foam Insulation in Tuskegee, AL
- Spray Foam Insulation in Deatsville, AL
- Spray Foam Insulation in Elmore, AL
- Spray Foam Insulation in Coosada, AL
- Spray Foam Insulation in Eclectic, AL
- Spray Foam Insulation in Hayneville, AL
- Spray Foam Insulation in Hope Hull, AL
- Spray Foam Insulation in Autaugaville, AL
Get an Attic Air Sealing & Insulation Estimate
Book an attic inspection and get a written quote.