Seal first, then add depth
Attic Insulation & Air Sealing in Lincoln, NE
Most of the comfort problems on a top floor start with air leaking through the ceiling into the attic.
- Free on-site estimates
- Written quote with material, thickness and R-value for each area
- Air leaks and moisture checked before anything gets covered
Why the Attic Comes First
Attic insulation and air sealing work best together, and in that order. Warm air rises, so in a Lincoln winter heated air pushes up through every gap in the top-floor ceiling: around plumbing vents, flue chases, light fixtures, bath fans, the attic hatch and the open tops of interior walls. In summer the flow reverses and the attic, which can run far hotter than the 78.1F July average outside, radiates heat back down. Adding insulation without sealing those holes leaves the air path open under the new layer.
The target: R-49
Nebraska's statewide energy code, the 2018 IECC adopted July 1, 2020, lists R-49 for ceilings in new homes and additions. LES uses the same R-49 target in its 2026 sealing and insulation incentive, which applies to existing homes whose attic insulation is at R-19 or less. Many older Lincoln attics hold a few inches of settled fiberglass or old cellulose, well below that.
Blown-in, foam or both
On a wide-open attic floor, the usual plan is to seal the leaks with foam and caulk, add baffles at the eaves so soffit vents keep breathing, then blow cellulose or fiberglass to depth. That is usually the most cost-effective way to reach R-49. Spray foam on the roof deck makes sense when ducts or a furnace sit in the attic, when the roof is a cathedral or low slope with no room for loose fill, or when an attic is being turned into living space.
Signs your attic needs work
Upstairs rooms that are hot in July and cold in January. Ice along the eaves after snow. Insulation you can see the ceiling joists through. Dark stains on insulation around fixtures and wall tops, which mark where dusty air has been leaking through. High heating and cooling bills on a house with an otherwise sound furnace and AC.
Rebates and loans
LES lists $0.50 per square foot for qualifying attic insulation in 2026, inside a $1,500 per-property cap, with blower door tests required before and after and pre-authorization required before the work starts. The state's Dollar and Energy Saving Loans also cover ceiling insulation and air sealing. We check whether your attic looks like a fit and explain each program's paperwork on the visit.
Get a free estimate or call (402) 795-8689.
What an Attic Job Includes
Sealing, depth and the details that keep an attic dry.
Bypass and top plate sealing
Foam and caulk over the gaps around pipes, wires, chases and the tops of interior walls.
Hatch and pull-down stair covers
Weatherstripping and an insulated cover so the access door is not the weak spot.
Eave baffles
Vent chutes at the soffits so new insulation does not block attic airflow.
Blown-in cellulose or fiberglass
Loose fill blown to an even depth toward R-49, with depth markers left in place.
Roof deck foam
Spray foam on the underside of the roof for cathedral ceilings, low slopes or attics with ductwork.
Typical 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, national numbers rather than local bids. How much sealing your attic needs, the depth added, access and any removal decide the total. We price after seeing the attic, and that written figure is what you pay.
How We Handle an Attic
1. Inspect
Measure current depth, find the leaks, check ventilation and look for roof leaks, rodents or vermiculite.
2. Quote
Air sealing and insulation priced as separate lines with the target R-value.
3. Seal
Close bypasses, cover the hatch and install baffles at the eaves.
4. Insulate
Blow loose fill to depth or spray the roof deck, then walk the attic with you.
Why Choose Us for Attic Insulation & Air Sealing
Sealing priced separately
You see what air sealing costs and what it covers.
Depth you can check
Rulers stay in the attic so anyone can confirm the depth later.
Attic Insulation & Air Sealing Questions
How much attic insulation do I need in Lincoln?
R-49 is the figure in Nebraska's 2018 IECC for new ceilings, and it is also the LES incentive target. The depth needed to reach it depends on the product's R-value per inch, and we leave depth rulers in the attic so you can check.
Should I remove the old insulation first?
Only if it is wet, moldy, full of rodent droppings or hiding vermiculite. Clean, dry insulation can stay, and new material goes on top after the leaks below it are sealed.
Will more insulation stop ice dams?
Insulation helps, but most ice dams come from warm air leaking into the attic and melting snow on the roof. Sealing those leaks and keeping the eaves vented is what makes the biggest difference.
Do I qualify for the LES attic incentive?
LES lists it for existing, occupied homes in its service territory whose attic is at R-19 or less, with the attic brought to R-49. Pre-authorization and before-and-after blower door tests are required, so the paperwork has to start before the work does.
Attic Insulation & Air Sealing Service Areas
- Spray Foam Insulation in Lincoln, NE
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- Spray Foam Insulation in Malcolm, NE
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- Spray Foam Insulation in Beatrice, NE
Get an Attic Insulation & Air Sealing Estimate
Send a photo from your attic hatch. We will tell you what we see and set a time to measure.