RetroFoam injection insulation is a game-changer in retrofit insulation for existing homes.

St Paul homes see big temperature swings and real winter drafts. Older bungalows, foursquares, and brick or stucco houses often have hollow wall cavities that leak heat in winter and let in summer heat. RetroGreen Energy installs RetroFoam injection wall insulation for existing homes. We fill hidden gaps without opening your walls so rooms feel more even and comfortable through Minnesota seasons.

Why Wall Insulation Matters in St. Paul

When walls are under-insulated, warm air escapes in winter and hot air seeps in during summer. Furnaces and air conditioners cycle more often, which adds wear and pushes up energy costs. In St Paul’s older housing stock and tightly spaced neighborhoods, wall insulation also helps reduce street noise. RetroFoam seals interior voids inside the wall cavity to create a continuous thermal and air barrier for more stable room temperatures.

A Retrofit Solution Without Tear-Out

We access each wall cavity through small holes behind siding or neat interior points when needed. The foam has a shaving-cream consistency during install, so it flows around wires and boxes to fill irregular spaces. After it cures, we patch access points and clean thoroughly so your home looks the same and feels better.

Benefits of RetroFoam insulation

Unlike loose-fill options in closed cavities, RetroFoam does not settle. It continues performing for years.

How RetroFoam Works

Our team mixes injection foam on site using a water-based resin, foaming agent, and compressed air. We inject the mixture into each cavity through small access points. After the foam sets, we plug the holes and replace siding or trim. The new insulation layer is hidden but effective and adds rigidity to the wall assembly.

Trusted Twin Cities Installer

RetroGreen Energy is an authorized RetroFoam installer serving St Paul and nearby neighborhoods including Highland Park, Macalester-Groveland, Como Park, Payne-Phalen, and Hamline-Midway. Our crews are trained in building science and work carefully around landscaping, garages, and tight lot lines common in the city. Homeowners choose us for clear communication, courteous crews, and clean job sites.

Good Fits For St Paul Homes

Panel siding injection: when siding can’t be removed

Steel, vinyl, aluminum siding:

Interior wall injection through sheet rock: