Lebanon, ME(800) 625-5958

Portsmouth, New Hampshire

Insulation and Air Sealing in Portsmouth, New Hampshire

Portsmouth is one of New Hampshire's oldest cities. Historic district rules mean upgrades need to work from the inside out. Blown-in insulation, interior air sealing, and rim joist spray foam are all compatible with historic preservation — because they don't change what the home looks like from the street.

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Portsmouth's Historic Homes and Energy Efficiency

The oldest Portsmouth homes were built with dense timber framing and no insulation — construction techniques standard for their era and completely inadequate for modern energy costs. Many have been updated over decades with spot repairs that addressed visible issues without ever tackling the thermal envelope systematically.

The result is a typical older Portsmouth home with: an attic that has some insulation but no air sealing underneath it, wall cavities that are empty or have compressed settled fiberglass from a 1970s retrofit, and a rim joist that was never addressed.

These are fixable problems. Our assessment finds them. Our crew addresses them — without changing the historic character of the home.

NHSaves registered contractor — rebate paperwork handled
Interior-only techniques compatible with historic preservation
BPI Certified Auditors — blower door and thermal imaging
Serving Portsmouth and all of Rockingham County
In-house crews, no subcontractors

Services Available in Portsmouth, New Hampshire

We assess your home, then our own crew does the work. NHSaves rebates handled for qualifying projects.

Insulation & Air Sealing

Our BPI Certified Auditors conduct full home assessments using blower door testing and thermal imaging. We then seal attic bypasses, rim joists, and penetrations throughout the envelope — followed by blown-in cellulose in the attic and dense-pack cellulose for walls through small drilled holes that are invisible after patching.

Heat Pumps

We install heat pumps sized for Portsmouth's historic homes — working around original architectural features while delivering modern comfort and efficiency. NHSaves rebates available for qualifying installations.

New Construction Insulation

New construction or major renovation in Portsmouth? We spec and install insulation on new builds throughout the Seacoast region — on your schedule, with full energy code documentation.

Polyurea Coatings

Waterproof coating for Portsmouth foundations and basement walls. Historic homes near the Piscataqua often have moisture challenges that polyurea addresses directly — bonding to stone, brick, or poured concrete foundations.

Portsmouth Homeowner Questions

Yes. All of our insulation and air sealing techniques work within the existing structure without altering the exterior appearance. Blown-in insulation, spray foam at the rim joist, and attic air sealing are all interior-only operations. Dense-pack cellulose for walls is installed through small holes patched and invisible after the work is complete.

Stop heating Portsmouth's historic streets.

Call (800) 625-5958 or request a free phone consultation. NHSaves rebates available.

or call (800) 625-5958

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