Retrofit Insulation for St. Louis Homes

Replace your old insulation with better technology that can save you money. Get a free estimate.

What Is Retrofit Insulation?

Retrofit insulation refers to adding insulation to an existing home without major demolition or reconstruction. Most St. Louis homes — particularly those built before 1990 — have little or no insulation in their exterior walls, minimal attic insulation, and uninsulated crawl spaces or rim joists.
Retrofit insulation is the process of addressing these deficiencies using modern techniques that work around the existing structure. Rather than tearing down walls, we use proven methods like injection foam, blown-in dense-pack, and exterior continuous insulation to bring your home up to current energy codes.

Retrofit Options for Existing Walls

Injection Foam — the least invasive wall insulation option. Small holes are drilled from the exterior or interior, foam is injected to fill the cavity, and holes are patched. Virtually no disruption to finished walls.
Blown-In Through Walls — similar process, using a dense-pack blown-in technique to fill wall cavities with cellulose or fiberglass. This method is particularly effective at eliminating air movement within the wall cavity.
Exterior Continuous Insulation — adding rigid foam insulation to the exterior before residing. More invasive but most thermally effective. This approach eliminates thermal bridging through studs and provides superior performance.

Why Older St. Louis Homes Need Retrofit Insulation

Many St. Louis homes were built in an era when energy was cheap and insulation standards were low. Homes built before 1980 often have zero insulation in exterior walls. The energy codes in Missouri have been updated repeatedly since then, but existing homes were grandfathered in.
The result: hundreds of thousands of St. Louis homes are dramatically under-insulated by today's standards. Your walls are literally just wood framing, drywall, and whatever external cladding was installed decades ago. Retrofit insulation is how we fix this without tearing down walls.

Benefits of Retrofit Insulation

• Immediate reduction in energy bills

• More consistent temperatures room-to-room

• Reduction in drafts and cold spots near exterior walls

• Improved soundproofing from street and neighbor noise

• Reduced strain on HVAC system

• Increased home resale value

• May qualify for Missouri energy efficiency incentives

The Retrofit Assessment Process

Quality Waterproofing + Insulation uses thermal imaging (infrared cameras) and blower door testing to identify exactly where heat is escaping before recommending any retrofit work. This eliminates guesswork and ensures every dollar you spend goes toward the highest-impact improvements.
We'll show you the thermal images and explain exactly what we found. This data-driven approach means no surprises and no wasted money on low-impact insulation work.

FAQ

Q1: Can you insulate my walls without opening them up?
A: Yes — through injection foam or dense-pack blown-in, we can fill wall cavities with minimal disruption.
Q2: How do I know if my walls are uninsulated?
A: We use thermal imaging to identify uninsulated wall areas — no guesswork, no unnecessary holes.
Q3: Does retrofit insulation require permits in St. Louis?
A: Typically no, but we'll advise on any local requirements specific to your project.
Q4: How much can I save after retrofitting my insulation?
A: Studies show 15-30% reduction in heating and cooling costs is common in properly retrofitted St. Louis homes.
Your older St. Louis home is leaving money on the table every month. Contact Quality Waterproofing + Insulation for a retrofit insulation assessment — we'll show you exactly where the energy is escaping and what it's costing you.