Air Sealing Services in New Hampshire
Most drafts, ice dams and frosty attics trace back to warm air leaking where it should not. Air sealing stops it at the source, and a blower-door test shows the result.
- NH licensed home inspector
- EPA certified lead renovator
- 55+ years combined experience
- 115K+ hours combined experience
- Read our Google reviews
Where we seal
- Attic bypasses: top plates, wire and plumbing holes, chases and light fixtures
- Attic hatches and pull-down stairs
- Rim joists and sill plates in the basement
- Gaps around chimneys, flues and other penetrations, using fire-rated materials where required
Measured, not guessed
A blower-door test before and after shows how much leakage was reduced. Pairing it with a building science assessment helps find the biggest leaks first.
Learn more
Read why air sealing comes first in New Hampshire, plus our guides to ice dams, frost in the attic and a drafty, cold upstairs.
What a typical attic air sealing and insulation job includes
Included
- Air sealing of top plates, penetrations and the hatch, before any insulation
- Vent baffles at the eaves
- Blown cellulose to R-60
Not included
- Bath fan venting or wiring
- Vermiculite or asbestos removal
- Roof or ventilation repairs
Comparing bids? Check for these
Lower bids often leave these out. Every Atlas estimate includes them.
- Air sealing before insulation (many insulation-only bids skip it)
- Vent baffles at the eaves
Want example prices first? Read the attic air sealing and insulation cost guide.
Read air sealing or more insulation?
Common questions
Should I air seal before adding insulation?
Yes. Insulation slows heat moving through it, but air leaking through gaps carries heat and moisture right past it. Sealing the gaps first makes the insulation work.
Will air sealing help with ice dams?
Often. Many ice dams start when warm air leaks into the attic and melts snow on the roof. Sealing those leaks attacks the cause.
Can a house be too tight?
A tight house needs planned ventilation, such as bath and kitchen fans or a balanced ventilation system. We look at ventilation as part of any air sealing job.
Can I get a price before anyone visits?
Yes. The Instant Ballpark gives a range for attic air sealing and insulation. The final price comes after a site visit and a written estimate.
Related reading
- Air Sealing First: Why New Hampshire Homes Need Airtightness Before More Insulation
- How to Prevent Ice Dams in New Hampshire Homes (and Why Heat Cables Are Not Enough)
- Frost in the Attic: What It Means in a New Hampshire Winter and How to Fix It
- Why Is My House So Drafty and Cold Upstairs? A New Hampshire Winter Diagnosis
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