What Is RetroFoam?
Injection Foam Built for Homes That Are Already Standing
Most homes built before 1990 have hollow wall cavities — zero insulation between you and the outside. Standard insulation options require tearing out drywall or siding to get inside those walls. RetroFoam doesn't.
RetroFoam is a low-pressure injection foam that expands to fill wall cavities completely. It flows around wires, pipes, and blocking — things that stop blown-in products cold — and cures into a stable, air-sealing material that doesn't settle or shift over time.
The result: a fully insulated wall from the inside out, installed in a single day, with holes no bigger than a quarter patched and painted before we leave.
Why Not Blown-In Insulation?
Blown-in cellulose and fiberglass rely on gravity to settle into wall cavities. This creates two problems:
- Gaps form at the top of cavities where the material can't reach
- The material compresses over time, reducing R-value
- Obstacles like blocking and wires create voids the material bridges over
- It doesn't air-seal — cold air still infiltrates through gaps
RetroFoam flows around all of it and air-seals as it cures.
Lifetime Warranty
The foam is warrantied for the life of your home — it won't settle, sag, or need replacing.
No Settling
Unlike blown-in products, RetroFoam cures rigid and stays put — full coverage permanently.
Non-Toxic
Safe for families, pets, and people with chemical sensitivities. No offgassing once cured.
Noise Reduction
Fills air gaps that transmit sound — quieter rooms, less street noise, less rain noise.
One-Day Install
Most homes are done in a single day. You stay home. Normal life resumes the same evening.
No Drywall Removal
Small access holes are drilled through siding or interior walls, then professionally patched.
01
Drill
Small access holes — about the size of a quarter — are drilled through your siding or from the interior. Location depends on your home's siding type.
02
Inject
RetroFoam is injected into each cavity. It expands to fill the entire space — flowing around wires, pipes, and blocking — then cures in place.
03
Patch
Every access hole is plugged and color-matched to your siding or interior wall. When we leave, most homeowners can't spot where we drilled.
Works With All Siding Types
RetroFoam can be installed through virtually any exterior siding — or from the interior when preferred:
Vinyl & Aluminum
Brick
Wood Lap
Cedar Shake
Hardie Board
Stucco
Concrete Block
Interior Drywall
