Most of the payoff is overhead
Attic Insulation & Air Sealing in McKinney, TX
Stop the leaks first, then add depth where the attic is thin.
- Free estimates at your home, not over the phone
- Quotes that list foam type, depth and R-value for each area
- Open-cell, closed-cell and blown-in, matched to the spot
Why the Attic Comes First
Attic Insulation & Air Sealing is usually the first job we suggest in a McKinney house, because the attic takes the worst heat and is the easiest place to fix. Insulation in a vented attic only works if the ceiling below it is airtight. When warm attic air can slip down through gaps around light fixtures, plumbing stacks, wiring holes and the attic hatch, or cooled house air can leak up into the attic, the insulation is fighting a losing battle no matter how deep it is.
Seal, then insulate
We start by sealing the openings that connect the house to the attic: top plates, plumbing and flue chases, wiring penetrations, duct boots where the registers meet the drywall, recessed lights rated for contact, and the hatch or pull-down stairs. Then we bring the insulation up to a full, level depth with blown-in fiberglass or cellulose, or with foam where blown material cannot stay in place, such as kneewalls and sloped ceilings.
How deep is enough
Collin County sits in IECC Climate Zone 3A. Texas's statewide minimum since September 1, 2016 has been the 2015 IRC energy chapter, which calls for R-38 in Zone 3 ceilings, and the 2021 IECC base table raised that to R-49. Plenty of older attics fall well short, and newer ones are often thin near the eaves or trampled around the air handler where other trades walked. We measure in several spots, not just next to the hatch.
Sealed attic as an alternative
When the air handler and long duct runs are in the attic, we will also price moving the insulation line up to the roof deck with spray foam. That costs more, but it puts the ducts inside the insulated space. If your ducts are short and the attic is simple, a sealed and deepened attic floor is usually the better value, and we say so.
What the Attic Job Can Include
Pick the pieces you need; each one is priced separately.
Air sealing
Top plates, chases, wiring and plumbing holes, duct boots and the attic hatch sealed with foam, caulk or rigid blocking.
Blown-in top-up
Fiberglass or cellulose blown to an even depth over what is already there, with depth markers so you can check it.
Kneewalls and slopes
Foam or batts with a proper backing on the walls and slopes around upstairs rooms and bonus rooms.
Hatch and stair covers
Insulated, weatherstripped covers for pull-down stairs and access panels.
Removal first
Old, wet, crushed or contaminated insulation vacuumed out before new material goes in.
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) |
Figures come from HomeGuide's January 2026 attic guide and Fixr's 2025 spray foam guide, both national. How much sealing your attic needs, the target depth, how easy it is to move around up there and whether old material comes out all change the total. The number on the written estimate we hand you is the one you pay.
How an Attic Job Runs
1. Inspect
We measure depth in several places, find leaks, and check the ducts, air handler platform and any old insulation.
2. Quote
Sealing, insulation depth and any removal are each priced on their own line.
3. Seal
Leaks between the house and attic are closed before any insulation goes in.
4. Insulate
Blown-in or foam goes on to the target depth, with markers so the depth can be checked later.
5. Review
We show you what was done and keep the access clear for HVAC service.
Why Choose Us for Attic Insulation & Air Sealing
Sealing is not skipped
Insulation alone over a leaky ceiling wastes money, so sealing is part of every attic quote.
Measured, not guessed
We check depth across the attic, not just at the hatch.
Service access kept
Walkways to the air handler and water heater stay clear after we finish.
Attic Insulation & Air Sealing Questions
Should I add blown-in on top of what I have?
Usually yes, as long as the existing insulation is dry and clean. If it is wet, moldy or full of debris, it should come out first, and we will tell you which case you are in.
What does air sealing actually fix?
It stops attic air from leaking into the house and house air from leaking out through the ceiling. Rooms tend to even out in temperature and the insulation can do its job.
Is R-38 or R-49 right for my McKinney attic?
R-38 is the 2015 Texas minimum for Zone 3 ceilings and R-49 is the 2021 IECC base-table figure. Many homeowners aim for at least R-38; we quote the depth for whatever target you choose.
Can you insulate around recessed lights?
Only fixtures rated for insulation contact can be covered directly. Older cans may need to be swapped or boxed in before insulation goes around them.
Attic Insulation & Air Sealing Service Areas
- Spray Foam Insulation in McKinney, TX
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Get an Attic Insulation & Air Sealing Estimate
Get the attic measured and priced, line by line.