Crawl spaces in the Bay Area are humid, drafty, and quietly dragging down your home's comfort. We insulate, vapor-seal and — when it makes sense — fully encapsulate, so your floors feel warm and your framing stays dry.
We document moisture levels, framing condition, existing insulation, pest activity, and any plumbing or electrical issues.
02
Cleanup & rodent-proof
Old fallen insulation is removed and bagged. Entry points are sealed with hardware cloth and copper mesh.
03
Vapor barrier & insulation
We install a 10–20 mil reinforced vapor barrier on the ground, then insulate floor joists or perimeter walls based on your scope.
04
Final walk-through
Photo documentation of every section, plus humidity baselines so you can track improvement over the seasons.
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 & site protection
20–30 min
Confirm crawl access, sump locations, and any pets or sensors
Lay drop cloths from entry point to crawl hatch
Set up HEPA negative-air machine at the crawl entrance
Suit up in Tyvek, respirators, and headlamps
02
Inspection & moisture survey
45–60 min
Map the crawl with photos — every joist bay, pier, and duct
Moisture-meter subfloor, sill plates, and any standing-water signs
Inspect existing vapor barrier, ducts, and plumbing insulation
Flag rodent activity, fungus, or pest damage with photos
03
Removal & remediation
1–3 hrs
Bag and remove fallen, wet, or rodent-fouled insulation
HEPA-vacuum the subfloor and pier tops
Apply EPA-registered sanitizer to affected wood
Seal accessible rim-joist gaps with closed-cell foam
04
Vapor barrier & insulation
3–5 hrs
Roll out 10-mil reinforced vapor barrier, overlapped and taped 12"
Mechanically fasten barrier up the foundation walls 6"
Install R-19 or R-30 batts in subfloor bays, paper side up
Strap or wire-mesh batts so they cannot fall over time
05
Cleanup & sign-off
20–30 min
Remove all debris, gear, and the negative-air setup
HEPA-vacuum the entry path and replace floor protection
Walk you through before/after photos on the tablet
Email Title 24 certificate, photo report, and warranty
Materials
The right material for your home.
Mineral wool batts
Fire-rated, moisture-tolerant batts cut tightly between joists. Our preferred choice for vented crawl spaces.
Closed-cell spray foam
Used on perimeter walls during encapsulation — adds R-value and acts as its own vapor barrier.
20-mil vapor barrier
Heavy-duty reinforced poly that won't tear underfoot. Seams taped and mechanically fastened to walls.
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
Damaged fallen insulation removed; full encapsulation with 20-mil vapor barrier
Marin · Mill Valley
BeforeAfter
02
Bare joists insulated with mineral wool batts, rim joists air-sealed
Oakland · Montclair
Homeowner stories
Words from the people who hired us.
★★★★★
"Our crawl space looked like a horror movie. Now it's a clean white room you could store boxes in. The musty smell upstairs is completely gone."
Aaliyah Brooks
Mill Valley · Full encapsulation
★★★★★
"Cold-floor problem solved overnight. They also sealed every possible rodent entry, which gave us huge peace of mind."
Mei Tanaka
Montclair · Joist insulation + rodent proofing
★★★★★
"Humidity sensor used to read 78% under the house. After their work it sits around 52%. The wood framing finally has a chance."
Carlos Mendoza
San Rafael · Vapor barrier + 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.
