Insulation Contractors Duluth MN
- Free on-site estimates
- Authorized Comfort Systems rebate contractor
- Licensed in MN & WI
Attic insulation and ventilation for Duluth homes
Looking for insulation contractors in Duluth, MN? Perrault Construction insulates attics and fixes the ventilation problems behind frost and ice dams, for homes in Duluth and across the Northland.
Our main product is Owens Corning AttiCat, a blown-in fiberglass insulation. We also correct attic venting and reroute bath fans that blow into the attic. The estimate is free, and we come to you.
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Comfort Systems insulation rebates start January 2027
Comfort Systems is the gas utility for the City of Duluth. In January 2027 it starts a rebate program for insulation and air sealing. If you heat with Comfort Systems gas, you may qualify. The program lists attic insulation and air sealing, wall, foundation and rim joist insulation, and floors over unheated spaces.
Perrault Construction is an Authorized Insulation Contractor for the program. Some rebates need an authorized contractor to do the work. Planning a project for 2027? We can quote it now, so you’re ready when the program opens.
Comfort Systems will share rebate amounts and how to apply closer to launch. We’ll add them here when they do.
Our work
A recent insulation job in Duluth
Attic insulation and ventilation upgrade in Duluth
This Duluth attic had thin, uneven insulation and a bathroom fan that vented into the soffit, which puts warm, wet air right where it can cause ice dams and frost on the roof deck. We moved the fan exhaust into a new tube with a gooseneck roof flashing so it vents outside, corrected the attic ventilation, and brought the attic insulation up to a modern level. The work was permitted and was completed in April 2026.
- What we planned for: Attic ventilation was corrected as part of the job (ridge or intake venting). Permitted and inspected. Attic insulation brought up to a modern R-value.
What an attic insulation job covers
In a Duluth winter, heat that leaks into the attic warms the roof deck. Snow melts from below, runs down and freezes again at the cold eaves. That’s an ice dam. Insulation keeps the heat in the house. Ventilation keeps the attic cold and dry. Most attics need both.
- Blown-in attic insulation. We blow in Owens Corning AttiCat fiberglass to bring thin or uneven attic insulation up to a modern R-value. Blown-in fills the gaps around joists and wires that rolled batts leave open.
- Attic ventilation. We correct the intake and ridge venting so moist air can leave the attic.
- Fans that vent into the attic. A bath fan that blows into the attic or soffit puts warm, wet air right where frost forms. We run it outside through the roof with proper flashing.
What sets the price
We price insulation after we’ve seen the attic, because no two are alike. The main things that move the number:
- the size of the attic
- how much insulation is already there
- whether vents need to be added or fixed
- whether any fans need to be rerouted outside
The on-site estimate is free and comes in writing.
How it works
- Call (218) 723-8477 or send the form. Tell us about the house and what you’ve noticed: cold rooms, ice dams, frost in the attic.
- Free on-site estimate. We check the insulation, the vents and any fans venting into the attic, then give you a written estimate.
- We do the work. With a permit when the job needs one.
Insulation questions
Do I qualify for the Comfort Systems insulation rebate?
You may if you’re a Comfort Systems natural gas customer and the work qualifies. The program starts in January 2027, and Comfort Systems will publish the full rules closer to launch. Perrault Construction is an Authorized Insulation Contractor for the program.
What insulation do you use?
For attics, mostly Owens Corning AttiCat, a blown-in fiberglass insulation. It’s blown in loose, so it fills around joists and wires and can be added on top of the old insulation to reach a modern R-value.
Will more insulation stop ice dams?
It’s part of the fix. Ice dams form when heat escapes into the attic and melts snow on the roof. Insulation slows that heat loss, and ventilation keeps the attic cold. We look at both, plus any fans venting into the attic, during the estimate.
Is the estimate free?
Yes. We come out, look at the attic and give you a written estimate at no charge. Call (218) 723-8477 or use the form on this page.
Where do you install insulation?
Duluth and the Northland, including Cloquet, Superior, Hermantown, Proctor, Two Harbors, Hibbing, Grand Rapids, Moose Lake and Solon Springs.
Northland Cities We Service
We insulate attics in Duluth and across the Northland, including these towns.