Specialty Services
Spray Foam Insulation
Open-cell & closed-cell spray foam for Seattle homes — attics, crawl spaces, rim joists, and walls. Stop air leaks. Cut energy bills 20–40%. Utility rebates available.
Seattle Spray Foam Insulation Experts
Stop Drafts. Cut Energy Bills. Protect Your Home from PNW Moisture.
Seattle's climate is one of the most demanding in the country for home insulation. With over 37 inches of annual rainfall, persistent marine humidity, clay-heavy soils, and cool winters, standard fiberglass batts simply can't keep up. Air still infiltrates around every gap, moisture finds every crack, and energy costs stay stubbornly high.
Spray polyurethane foam (SPF) is the gold standard solution for Pacific Northwest homes. Unlike batts or blown-in insulation, spray foam expands to fill every void — creating a seamless air barrier and thermal envelope that dramatically reduces heating and cooling loads. Closed-cell foam also acts as a vapor retarder, protecting your crawl space, rim joists, and basement from Seattle's relentless moisture.
Ergo Construction's certified spray foam technicians serve Seattle, Bellevue, Kirkland, Redmond, and all of King County — bringing deep local expertise, transparent pricing, and rebate assistance to every project.
Recent Spray Foam Projects
From crawl spaces and rim joists to full attic encapsulation — Seattle and King County spray foam installation by Ergo Construction.
Open-Cell vs. Closed-Cell Spray Foam
Two types of spray foam — each with distinct advantages. We'll recommend the right one for your project during your free consultation.
Open-Cell Spray Foam
R-3.7 per inch
Best for: Interior walls, attics, soundproofing
- ✔ Lower cost per sq ft
- ✔ Excellent soundproofing
- ✔ Fills every gap and cavity
- ✔ Breathable — allows moisture to pass
Closed-Cell Spray Foam
R-6.5 per inch
Best for: Crawl spaces, rim joists, exterior walls, flood zones
- ✔ Highest R-value available
- ✔ Vapor and moisture barrier
- ✔ Structural reinforcement
- ✔ Ideal for PNW wet climates
Where We Install Spray Foam
Every area of your home where air leaks, moisture intrudes, or energy escapes — spray foam seals it permanently.
Attics
Seal the attic floor or roof deck to prevent heat loss — the #1 source of energy waste in Seattle homes.
Crawl Spaces
Closed-cell foam on crawl space walls and rim joists stops cold air, moisture, and pests from entering your home.
Rim Joists
One of the most cost-effective upgrades in any home — rim joists are the biggest air leakage point in most PNW homes.
Walls & Cavities
New construction or retrofit — spray foam fills every gap in wall cavities for maximum airtightness.
Commercial Buildings
Warehouses, shops, and commercial spaces — spray foam delivers superior thermal performance at scale.
Basements & Foundations
Protect your basement from Seattle's clay soils and groundwater intrusion with closed-cell foam.
Why Spray Foam Is the Right Choice for Seattle Homes
Traditional insulation leaves gaps. Spray foam doesn't — and that difference adds up to real savings every month.
Stops Air Infiltration
Spray foam expands to fill every crack, gap, and void — eliminating the drafts that traditional batt insulation misses entirely.
Moisture & Vapor Barrier
Closed-cell foam acts as a Class II vapor retarder — critical for Seattle's wet marine climate and clay-heavy soils.
Reduces Energy Bills 20–40%
Homeowners typically see a 20–40% reduction in heating and cooling costs after spray foam installation.
Soundproofing
Open-cell spray foam dramatically reduces sound transmission through walls — ideal for home offices, bedrooms, and shared walls.
Pest Barrier
Spray foam's rigid, seamless surface leaves no entry points for rodents, insects, or other pests.
Increases Home Value
Energy-efficient upgrades consistently return value — spray foam insulation is a top ROI home improvement in the Pacific Northwest.
Closed-Cell Spray Foam — Seattle Cost Guide
Typical installed cost ranges for closed-cell spray foam in western Washington. Prices reflect local labor rates ($95–$175/hr) and material costs. Get a free on-site quote for your exact project.
| Application Area | Thickness | Rate Range | Example Project Cost | Est. Annual Savings |
|---|---|---|---|---|
| Exterior & Interior Walls Ideal for 2×4 framing where space is tight but R-value must be maximized. | 2–3 inches (R-13 to R-21) | $3.00–$6.50/sq ft | $3,000 – $6,500 (1,000 sq ft example) | 🟢 $300–$600/yr |
| Roof Underside & Vaulted Ceilings Hot roof / conditioned attic. Often paired with flash-and-batt to hit WA energy code. | 3–5 inches (R-20 to R-35+) | $4.50–$10.00+/sq ft | $6,750 – $15,000 (1,500 sq ft example) | 🟢 $500–$1,000/yr |
| Crawl Spaces & Rim Joists Premium choice for western WA — completely blocks moisture & pests. Higher labor due to tight access. | 2 inches (Class II vapor retarder) | $3.00–$5.50/sq ft | $3,000 – $5,500 (1,000 sq ft example) | 🟢 $400–$700/yr |
| Basements & Concrete Foundation Walls Prevents moisture seeping through below-grade concrete into future finished spaces. | 1.5–2 inches | $2.50–$5.00/sq ft | $2,000 – $4,000 (800 sq ft example) | 🟢 $200–$400/yr |
⚠️ Key Variables in Seattle Estimates
- Minimum Mobilization Fee: $1,500–$2,500 minimum charge to bring out the rig, regardless of job size
- Labor Rate: $95–$175/hr for professional spray foam technicians in King County
- Existing Insulation Removal: Add $1.00–$2.00/sq ft if old fiberglass batts or rodent-damaged material must be removed first
- Tight Access: Crawl spaces with low clearance or complex framing add labor cost
- Ignition Barrier: Code may require a thermal/ignition barrier over exposed foam in living spaces
💰 After Rebates & Tax Credits
Most Seattle homeowners qualify for PSE rebates and the 30% IRA federal tax credit — reducing your net project cost by $500–$2,500+ depending on scope. We handle all the paperwork.
See All Available Rebates →Interactive Cost Calculator
Estimate your closed-cell spray foam project cost instantly. Select your application area and enter your square footage — we'll calculate the range and help you understand your rebate potential.
Your Project Details
Fill in your project details and click Calculate to see your estimate.
* Estimates are for budgeting purposes only and are based on typical Seattle-area market rates. Actual costs depend on site conditions, access, and scope. Get a free on-site quote for your exact project.
Energy Rebates & Tax Credits
Seattle and King County homeowners can significantly offset the cost of spray foam insulation through utility rebates and federal tax incentives. Ergo Construction helps you identify and claim every dollar you're entitled to.
Puget Sound Energy (PSE) — Home Insulation Rebate
Up to $0.30/sq ft (open-cell) · Up to $0.50/sq ft (closed-cell)
Eligible: PSE electric or gas customers
Pre-approval may be required. Rebate paid after installation verification.
Learn More →Seattle City Light — Energy Efficiency Rebate
Up to $0.25/sq ft for air sealing + insulation combo
Eligible: Seattle City Light customers
Must use a BetterHome WA certified contractor. Ergo is BetterHome eligible.
Learn More →Inflation Reduction Act (IRA) — Federal Tax Credit
30% of project cost, up to $1,200/yr
Eligible: All US homeowners (primary residence)
Claim on IRS Form 5695. No income limit. Applies to insulation materials.
Learn More →Washington State Weatherization Program
FREE insulation for income-qualifying households
Eligible: Income ≤ 200% of federal poverty level
Administered by Community Action Agencies. We can help verify eligibility.
Learn More →Snohomish County PUD — Insulation Rebate
Up to $400 per project
Eligible: SnoPUD electric customers
Must be installed by a licensed contractor. Rebate on attic + wall insulation.
Learn More →Our 6-Step Installation Process
From your first call to the final air quality check — we make spray foam installation simple, safe, and stress-free.
Free Home Assessment
We visit your home, identify air leakage and moisture issues, and recommend open-cell vs closed-cell based on your specific PNW climate zone and budget.
Detailed Written Quote
You receive a transparent, itemized estimate — including any applicable utility rebates we'll help you claim, so you know your true net cost.
Prep & Protect
Our crew masks off all surfaces, installs ventilation, and ensures your home is fully protected before any foam is applied.
Expert Installation
Licensed spray foam technicians apply the correct foam type at the right thickness to meet Washington State energy code requirements.
Air Quality Check & Cleanup
After curing, we verify air quality, remove all masking, and leave the work area cleaner than we found it.
Rebate Assistance
We help you complete PSE, Seattle City Light, and IRA paperwork to maximize your rebates and tax credits.
Spray Foam FAQ
Common questions from Seattle homeowners about spray foam insulation — answered by our local experts.
How long does spray foam insulation last?
Spray foam insulation is designed to last the lifetime of the building — 80+ years. Unlike fiberglass batts, it does not sag, settle, or lose R-value over time. It also won't absorb moisture or support mold growth.
Is spray foam insulation safe for my home?
Yes. Once fully cured (typically 24 hours after installation), spray polyurethane foam is inert, non-toxic, and safe. During installation, the area must be vacated and ventilated. Our crew uses full respiratory protection and follows all EPA and OSHA guidelines.
What is the difference between open-cell and closed-cell spray foam?
Open-cell foam (R-3.7/inch) is softer, more flexible, and excellent for soundproofing and interior applications. Closed-cell foam (R-6.5/inch) is rigid, acts as a moisture barrier, and is ideal for crawl spaces, rim joists, and exterior-facing surfaces in Seattle's wet climate.
Can spray foam be installed over existing insulation?
In most cases, yes — especially for air sealing rim joists and attic hatches. However, for full wall or attic retrofits, the old insulation is often removed first for best results. We assess each situation on-site during the free consultation.
How soon can I return to my home after spray foam installation?
We recommend staying out of the treated area for at least 24 hours after installation to allow full curing and proper ventilation. Our team will walk you through all safety guidelines before and after the job.
Do I need a permit for spray foam insulation in Seattle?
Typically, spray foam insulation does not require a building permit in Seattle for standard insulation work. However, if the job involves other scope — like encapsulating a crawl space or combining with structural work — a permit may be required. We will clarify this during your free consultation.
Spray Foam vs. Traditional Insulation
See why Seattle homeowners are upgrading from fiberglass batts and blown-in to spray foam.
| Factor | Spray Foam ✅ | Fiberglass Batts | Blown-In |
|---|---|---|---|
| Air Sealing | Complete air barrier | None — air passes through | Minimal |
| R-Value per Inch | R-3.7–6.5 | R-2.2–3.8 | R-2.2–3.8 |
| Moisture Resistance | Excellent (closed-cell = vapor barrier) | Poor — absorbs moisture | Fair |
| Lifespan | 80+ years — no settling | 15–20 years — sags & settles | 10–15 years — settles |
| Pest Resistance | Excellent — no entry points | Poor — rodents nest in batts | Fair |
| Energy Savings | 20–40% reduction | 5–15% reduction | 10–20% reduction |
| Upfront Cost | Higher | Lowest | Low–Medium |
| Long-Term ROI | Best — pays back in 3–7 years | Limited | Moderate |
Ready to Cut Your Energy Bills?
Get a free on-site assessment — we'll recommend the right foam, estimate your rebates, and give you a transparent quote with no pressure.