The attic is where 25–40% of a Bay Area home's energy escapes. We air-seal, then install blown-in cellulose or fiberglass to R-49 or higher — engineered for Title 24 and built to last decades.
We measure existing R-value, scan for hot spots, and check ventilation, knob-and-tube wiring, and pest activity.
02
Prep & air sealing
Top-plates, recessed lights, plumbing penetrations and the attic hatch are sealed before any insulation goes down.
03
Install to spec
Calibrated blowers deliver consistent coverage to R-49 or your target. Depth markers are installed so the work is verifiable.
04
Cleanup & sign-off
We HEPA-vacuum the workspace, walk you through photos, and provide documentation for rebates and tax credits.
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 scope, access points, and any pets or sensitive areas with you
Lay drop cloths from the front door to the attic hatch
Set up HEPA-filtered negative-air machine inside the attic
Mask off vents and the attic opening to keep dust out of living space
02
Inspection & thermal scan
30–45 min
Measure existing insulation depth and R-value at 6+ points
Thermal-image the ceiling plane for hot spots and bypasses
Photograph knob-and-tube, junction boxes, and bath-fan ducting
Check soffit vents and baffles for blockages
03
Removal (if needed) & air sealing
1–3 hrs
HEPA-vacuum out contaminated or rodent-damaged insulation
Sanitize the attic deck with EPA-approved disinfectant
Foam-seal top plates, recessed lights, plumbing & wiring penetrations
Weatherstrip and insulate the attic access hatch
04
Blow-in install to target R-value
2–4 hrs
Install ruler-style depth markers every 300 sq ft
Blow cellulose or fiberglass evenly to R-49 or your spec
Verify final depth at every marker and re-top any low spots
Photograph finished coverage for your records
05
Cleanup & sign-off
20–30 min
Roll up drop cloths and HEPA-vacuum the work path
Walk you through before/after photos on the tablet
Hand over Title 24 certificate and rebate paperwork
Email digital copies and a 1-year workmanship warranty
Materials
The right material for your home.
Blown-in cellulose
Recycled paper treated with borate. High R-value per inch, excellent at slowing air movement and dampening sound.
Blown-in fiberglass
Lightweight, non-absorbent, non-settling. Ideal for attics with marginal framing or where weight matters.
Batt insulation
Pre-cut fiberglass or mineral wool batts for kneewalls, garage ceilings and accessible joist bays.
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
1920s craftsman attic — old fiberglass removed and replaced with R-49 cellulose
Oakland · Rockridge
BeforeAfter
02
Bare-joist attic brought up to R-60 with depth markers verified throughout
Berkeley · Elmwood
Homeowner stories
Words from the people who hired us.
★★★★★
"Our upstairs used to be 10° hotter than downstairs every summer. After Johnson's redid the attic, the whole house finally feels even. Wish we'd done it years ago."
Mei Tanaka
Oakland · Attic re-insulation
★★★★★
"They removed 40 years of dirty insulation, sealed everything, and blew in fresh cellulose in a single day. The crew was respectful and the cleanup was spotless."
Carlos Mendoza
Berkeley · Removal + R-49 install
★★★★★
"PG&E bill dropped about 25% the first month. More importantly, the bedroom over the garage is finally usable as an office."
Aaliyah Brooks
El Cerrito · R-60 top-up
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.
