Most Perham homes built during the 1910s-1970s small lake town era have completely empty wall cavities behind their vinyl siding. These uninsulated walls are the single largest source of heat loss, allowing cold air to flow freely through the exterior envelope every time the wind blows. For Perham homeowners, that translates to high heating bills, cold drafts near exterior walls, and rooms that never seem to reach a comfortable temperature.
RetroGreen Energy solves this with RetroFoam injection insulation — a tripolymer foam that we inject directly into the wall cavities through small holes drilled in the exterior. The foam expands to fill every gap, crack, and void, creating a complete thermal and air barrier without removing any siding or disturbing interior finishes. We work with vinyl, cedar shake, aluminum — all siding types found on Perham homes. Most wall insulation projects in Perham are completed in a single day.
Perham homeowners served by Otter Tail Power can qualify for rebates of Up to $1,000 per measure on qualifying insulation upgrades. We handle the rebate paperwork and offer 0% financing up to 60 months. Call (320) 252-8888 to schedule your free diagnostic assessment and see exactly where your walls are losing heat.
Key Benefits
Lower Energy Bills
RetroFoam's air seal stops conditioned air from escaping. Most homeowners see a 15-50% reduction in heating and cooling costs.
Consistent Room Temperatures
No more hot and cold spots. Every room maintains a comfortable temperature because the envelope is properly sealed.
Reduced Outdoor Noise
The dense foam acts as a sound barrier, significantly reducing traffic noise and other outdoor disturbances.
No Moisture or Mold Risk
RetroFoam doesn't absorb water and doesn't promote mold growth, unlike fiberglass which can trap moisture inside wall cavities.
Common Perham Home Types We Insulate
Bungalow
1910s-1970s small lake townCommon in Downtown Perham, Little Pine Lake
Bungalows in Perham typically have 2x4 wall framing with empty cavities behind vinyl siding. RetroFoam injection fills these cavities completely in one day.
Rambler
1910s-1970s small lake townCommon in Downtown Perham, Little Pine Lake
Perham's ramblers from the 1910s-1970s small lake town era were mass-built with empty wall cavities and no insulation. These are ideal candidates for RetroFoam injection.
Lake cottage
1910s-1970s small lake townCommon in Downtown Perham, Little Pine Lake
Lake cottage homes in Perham benefit from wall insulation injection through the exterior, with no interior disruption to the home.
Our Process in Perham
Siding Removal and Preparation
We carefully remove a course of siding to expose the wall sheathing beneath. Each stud cavity is located and a small hole is drilled. Our technicians use a specialized tool to check for obstructions inside the wall before injection begins.
RetroFoam Injection
RetroFoam the resin is mixed in the truck, then injected into each wall cavity through the drilled holes. The foam flows to fill every gap, crack, and void — wrapping around wiring, plumbing, and any obstacles. Pressure gauges ensure complete fill without over-packing.
Seal, Replace, and Verify
All drill holes are plugged and sealed. Siding is carefully replaced to its original position. We perform a final inspection to verify complete coverage and ensure your home looks exactly as it did before.