Multi-Family Building Insulation

The Multi-Family Challenge

Traditional Insulation Methods Don't Work When People Are Living There

In a single-family home, an insulation retrofit is already disruptive — demolishing drywall means weeks of work and displacement. In a multi-family building, it's practically impossible. Tenants can't be expected to vacate, HOA boards won't approve months of construction, and shared walls make coordination a nightmare.

RetroFoam sidesteps all of this. Because installation happens through small holes drilled from the building exterior — not from inside each unit — tenants don't need to be home, furniture doesn't need to move, and there's no drywall to repair afterward. The access holes are plugged and matched to the siding before the crew leaves.

We work unit-by-unit or section-by-section, scheduling around your building's needs — one floor, one wing, or one building at a time.

What Tenants Experience During Install

Drilling noise is brief — a few seconds per hole
No interior access required in most cases
No dust, no fumes, no odor inside units
Tenants can be at work or home — either works
Units are accessible again the same day
Most tenants don't notice work is happening until it's done

Property Types

Buildings We Insulate

Apartment Buildings

Low-rise and mid-rise. Exterior foam injection building-wide. Coordinate with property management for scheduling.

Townhomes & Row Houses

Shared exterior walls and party walls — ideal for injection foam to reduce both noise and heat loss between units.

Condo Buildings

HOA-managed buildings benefit from a building-wide approach — coordinated through the association, executed with no unit disruption.

Duplexes & Triplexes

Smaller multi-family properties — often completed in a single day per building.

Mixed-Use Buildings

Commercial ground floor, residential above. Insulate each section on a compatible schedule.

Senior & Affordable Housing

Low-disruption installs are especially important in buildings with vulnerable populations. RetroFoam is non-toxic and noise-minimal.

For Landlords & Property Owners

Reduce tenant heating complaints and turnover
Lower common-area energy costs
Improve building energy performance ratings
No unit vacancy required during install
Lifetime warranty — no future maintenance cost

For HOA Boards

Improve shared-wall STC ratings between units
Exterior injection — no unit owner approval needed for access
Building-wide project coordinated through the association
Phased approach fits HOA budgeting cycles
Non-toxic — no health concerns for residents

Wall Insulation for Apartments, Condos & Townhomes