Most older Maine homes have little to no insulation in their exterior walls. Dense pack cellulose and spray foam let us fix that — without tearing out your drywall.
The biggest misconception about wall insulation retrofits is that you need to tear out all your drywall to do it. In most cases, you do not. Dense pack cellulose can be blown into existing wall cavities through small holes drilled from the exterior or interior — typically covered by the existing siding or patched and painted when the work is complete.
This makes wall insulation one of the most accessible upgrades for older Maine homes. If your walls are uninsulated or underinsulated — common in homes built before the 1980s — adding wall insulation significantly improves comfort, reduces drafts from outlets and switch plates, and lowers heating costs month after month.
Wall insulation projects qualify for Efficiency Maine rebates when installed by a certified contractor. We handle the documentation and application support as part of every project.
The most common wall retrofit method in Maine. Cellulose is blown under pressure through small holes, compressing to approximately 3.5 lbs/cu ft. It fills the cavity completely, eliminates air pockets, and reduces convective heat loss. R-3.7 to R-4.0 per inch. Best for wood-framed walls with standard stud bays.
Learn About Blown-In Insulation →Best for new construction, walls open during renovation, or rim joist areas. Spray foam is fully air-sealed and moisture-resistant. Closed-cell spray foam adds structural rigidity and acts as a vapor barrier. Higher cost but the right choice when walls are already open.
Learn About Spray Foam Insulation →We assess your wall construction, stud bay locations, existing insulation levels, and the best access method. We note any moisture issues, pest damage, or non-standard framing that could affect the installation.
Small holes are drilled in each stud bay. Exterior access through siding is preferred to minimize interior disruption, but interior drilling is used when necessary. Every effort is made to minimize visual impact.
Cellulose is blown under controlled pressure to achieve proper fill density. Each stud bay is monitored during installation and verified for complete fill to ensure consistent coverage throughout the wall assembly.
All access holes are plugged and patched. Siding or interior surfaces are restored to their original condition. We provide an R-value certificate and handle all Efficiency Maine rebate documentation.
Yes. Dense pack cellulose can be blown into existing wall cavities through small holes drilled from the exterior or interior. The holes are patched after installation and most homeowners cannot tell work was done.
Dense pack cellulose is the most common and effective choice for wall retrofits in Maine, providing R-3.7 to R-4.0 per inch. Blown-in fiberglass is an alternative. Spray foam is the best option when walls are already open during renovation, offering superior air sealing and moisture control.
A typical wall insulation retrofit in Maine costs between $2,000 and $6,000 depending on the size of the home, number of wall cavities, access method, and insulation type. Efficiency Maine rebates can help offset the cost. Contact us for a specific quote.
Yes. Wall insulation projects qualify for Efficiency Maine rebates when installed by a certified contractor and the project achieves the required R-value improvement. Mattra handles all rebate documentation as part of every project.
Financing & Rebates Details →Wall insulation works best as part of a complete home performance project. Combine with attic air sealing, rim joist spray foam, and blower door testing for maximum results.
Our team assesses your wall construction, recommends the right method for your home, and provides a clear estimate before any work begins. Most wall insulation retrofit projects are completed in one to two days with minimal disruption to your home.
Mattra Inc. · 68 Whipple St, Lewiston ME 04240
(207) 777-6020 ·
info@mattrainc.com
Questions? Call (207) 777-6020 or email info@mattrainc.com