Wall Injection Insulation — No Drywall Tear-Out

Dense-pack and injection foam for empty wall cavities in pre-1980 Salt Lake homes. Small ports, full cavities, one-day retrofits.

If your home was built before 1980 in neighborhoods like The Avenues or central Sugar House, there is a real chance exterior walls are empty or hold thin, settling batts that do not meet the cavity. Wall injection lets us add R-value and reduce drafts without a whole-house drywall job. We choose injection strategy based on cladding, sheathing, and whether there is poly, craft paper, or open stud bays.

How ports are placed

Exterior strategies drill through mortar joints or siding courses; interior strategies use paint-patchable holes behind baseboards when that yields better concealment. The goal is predictable fill without bulging drywall or blocking drainage planes. We discuss the approach during the estimate so you know where patchwork lands.

Dense-pack vs. open-cavity foam

Dense-pack cellulose can stabilize existing batts and fill odd voids behind diagonal bracing. Some assemblies benefit from slow-rise injection foam when air sealing and higher R per inch matter. We do not spec foam blindly — moisture drive, permeability, and existing vapor strategies all matter in Utah’s cold-dry winters and hot-dry summers.

Comfort signals that walls are the issue

Rooms that feel cold on windy days, exterior walls that read hot on summer thermal scans, and large first-floor temperature gaps with no duct issues often trace to empty stud bays. Attic upgrades alone cannot fix a leaky wall field; combining ceiling air sealing with wall injection is where customers report the “whole house finally feels even” outcome.

Rebates

Utility incentives sometimes treat wall insulation as a separate measure from attic top-ups. We map measures to the program tables you qualify for and avoid stacking assumptions that fail audit.

Book a walkthrough — we’ll probe outlets and bays where safe, show thermal imagery, and give an honest go/no-go if the assembly is not injectable.