Most pre-1980 Bay Area homes have little or no wall insulation. We retrofit existing wall cavities with dense-pack cellulose or injection foam — no demolition, no mess, dramatic results.
Up to 70% reduction in street and room-to-room noise
Eliminates cold-wall drafts in winter
Stops summer heat from radiating indoors
No drywall demolition required
Improves overall envelope tightness
IRA tax credit eligible
Our process
Methodical from inspection to cleanup.
01
Wall assembly assessment
We borescope a sample cavity to confirm what's in your walls and check for obstructions, wiring or moisture.
02
Access planning
We choose interior or exterior access points based on finishes — typically 2" holes between studs that are patched after install.
03
Dense-pack install
Cellulose is blown to 3.5 lb/ft³ — the density that prevents settling and creates the sound-dampening monolith.
04
Patch & finish
Holes are plugged, taped, and textured to match. Final walk-through with thermal imaging to verify complete fill.
Day-of checklist
Exactly what happens at your appointment.
Every visit follows the same checklist so nothing is skipped — and so you know exactly what your crew is doing, when.
01
Arrival & walkthrough
20–30 min
Confirm wall sections to be insulated and finish color for plug patches
Protect floors, furniture, and landscaping with drop cloths
Locate studs, fire blocks, and any plumbing or wiring in target walls
Mark hole locations with low-tack tape — review with you before drilling
02
Inspection & moisture check
30–45 min
Borescope inspect 2–3 wall cavities to confirm they're empty and dry
Moisture-meter siding and interior drywall around bathrooms & kitchens
Thermal scan exterior walls for cold spots and existing insulation
Photograph any pre-existing siding cracks or stucco damage
03
Drill & dense-pack install
3–5 hrs
Drill 2-inch access holes between studs at top and mid-height
Dense-pack cellulose to 3.5 lbs/ft³ — verified by hose pressure
Move bay-by-bay so no wall is left open overnight
Probe-check fill density at random bays before patching
04
Patch & finish
1–2 hrs
Install matching siding plugs or stucco patches in every hole
Sand and texture-match stucco patches to surrounding finish
Touch-up paint or mark patches for your painter (your choice)
Caulk plug edges so they're weather-tight
05
Cleanup & sign-off
20–30 min
Sweep & blow off siding, walkways, and landscaping
Walk the exterior with you to inspect every patch
Provide install diagram showing every drilled bay
Email Title 24 certificate and 1-year workmanship warranty
Materials
The right material for your home.
Dense-pack cellulose
Our go-to for retrofits. Vapor-open, sound-dampening, and proven on Bay Area homes for decades.
Injection foam
For cavities where higher R-value per inch matters. Self-leveling and ideal for irregular wall shapes.
Mineral wool batts
Used when walls are open for remodel — fire-rated and excellent at sound control between bedrooms.
Before & after
Real Bay Area projects, side by side.
Every install is documented with photos so you can see exactly what we did — and so can your inspector.
BeforeAfter
01
Open stud bays in a 1940s bungalow dense-packed to 3.5 lb/ft³
Alameda
BeforeAfter
02
Drill-and-fill retrofit — access holes patched and texture-matched
San Francisco · Sunset
Homeowner stories
Words from the people who hired us.
★★★★★
"We live on a busy street and the road noise was constant. After the dense-pack install, it's almost gone. Patching looked seamless once painted."
Carlos Mendoza
San Francisco · Whole-house wall retrofit
★★★★★
"Did our kids' bedrooms first to dampen sound between rooms. It worked so well we hired them back for the rest of the house."
Aaliyah Brooks
Alameda · Bedroom sound dampening
★★★★★
"They accessed every cavity from outside so we didn't have to deal with dust inside. Walls feel warmer to the touch in the morning now."
Mei Tanaka
Oakland · Exterior-access wall insulation
Savings calculator
Estimate what you'll save each year.
Three quick questions. Numbers use 2024–25 PG&E rates, CEC climate-zone data, and DOE / ENERGY STAR savings ranges for upgrading to Title 24 (2022) code.
Home size
Current insulation
Climate zone
Your estimate
Estimated annual savings
$291
≈ $24 / month off heating & cooling
10-year savings
$2,910
CO₂ avoided / yr
930 lbs
Comfort boost
Even temps, fewer drafts
Estimates only. Actual savings vary by home condition, HVAC equipment, utility rates and usage. We'll confirm exact numbers during your free on-site assessment.
View assumptions for your selections
Your home
Home size
1,200 – 2,200 sq ft → 1,700 sq ft modeled
Current insulation
Attic ≈ R-19, walls ≈ R-11
Title 24 (2022) target
Attic R-38, walls R-13 + R-5 c.i. (or R-20)
Estimated HVAC reduction
18% of heating + cooling load
Climate & rates
Climate zone
Inland Bay (Walnut Creek, Napa) — multiplier ×1
Baseline HVAC cost
$0.95 / sq ft / yr (CZ12 reference)
PG&E electric rate
≈ $0.45 / kWh (2024–25 avg)
PG&E gas rate
≈ $2.52 / therm (2024–25 avg)
CO₂ factor
3.2 lbs CO₂ / $ saved (≈65% gas, 35% electric)
Calculation
1,700 sq ft × $0.95 × 1 (climate) × 0.18 (savings) = $291 / yr
Sources: DOE Guide to Home Insulation, ENERGY STAR Seal & Insulate methodology, CEC 2022 Title 24 envelope requirements, PG&E 2024–25 rate advisories, and the 2024 CEC Power Content Label for PG&E.
FAQ
Questions, answered.
Don't see your question? Call us at (510) 660-0455 or request a free estimate.
Book an appointment
Pick a time — we'll be there.
On-site visits are free and take about an hour. Choose any open Monday–Friday slot in the next two weeks; booked times disappear from the picker in real time so you never double up.
