A Local, Family-Run Crew
You deal with the same people from the first phone call to the finished job — no call centres and no rotating subcontractors.
Family-run · Northwest Washington
Crawl Space & Attic Insulation Done Right
RGS Crawl Space Insulation LLC pulls out old, wet and rodent-damaged insulation and installs high-performance replacements that make your home warmer, drier and cheaper to heat. Serving Skagit, Whatcom, Whidbey Island, Snohomish and King County since day one — with free, no-pressure estimates.
- Free on-site estimates
- 30+ years combined experience
- 5% senior or military discount
Get a Free Quote
Tell us about your project — we usually reply the same day.
Crawl Space Insulation
Removal, replacement, vapor barrier and full clean-out.
Attic Insulation
Blown-in and batt upgrades that stop heat escaping upward.
Encapsulation & Drainage
Sealed liner, sump pumps and interior drainage.
Free Written Estimates
On-site assessment, clear pricing, zero pressure.
Why Homeowners Call Us Back
Insulation Work You Can Actually Trust
Insulation is one of the few home improvements nobody ever sees. That makes it easy to cut corners on — and it is exactly why we document everything we do.
30 Years of Combined Experience
Our installers have spent decades in Northwest Washington crawl spaces and attics. Wet ground, tight access, rodent damage — we have seen it.
Clean, Careful Work
Floors are protected, old material is bagged and hauled away the same day, and we leave your crawl space cleaner than we found it.
Honest, Written Pricing
Every estimate is free, in writing and explained in plain language. Seniors or military households receive 5% off qualifying projects (one discount per project — they don’t stack).
30+Years combined experience
5Counties served
5%Senior or military discount
$0Cost for an estimate
What We Do
Insulation Services
Crawl spaces and attics are our speciality, and we cover everything that has to happen around them to make the insulation last.
Crawl Space Insulation
Under-floor batt insulation installed tight to the subfloor and properly supported so it never sags. We handle removal of the old material, sub-floor insulation, rim joists and access hatches.
More on Crawl Space Insulation
Attic Insulation
Blown-in or batt insulation brought up to modern depth, with baffles at the eaves and a sealed attic hatch. The single highest-return insulation upgrade in most Washington homes.
More on Attic Insulation
Insulation Removal & Clean-Out
Wet, compressed, rodent-damaged or smoke-affected insulation vacuumed and bagged out, along with debris left behind by earlier trades. A clean cavity is the only honest starting point for new material.
More on Insulation Removal
Vapor Barrier & Ground Cover
Heavy-gauge polyethylene lapped, sealed and run up the stem walls to cut the moisture that rises out of bare soil — the root cause of most failed crawl space insulation in this region.
More on Vapor Barrier
Blown-In & Batt Insulation
Loose-fill fiberglass for open attic floors and irregular cavities, faced or unfaced batts for joist bays and walls. We match the material to the assembly rather than to whatever is on the truck.
More on Blown-In & Batt
Duct Sealing & Insulation
Leaky, bare or crushed ducts wasting the air you already paid to heat get sealed, re-supported and wrapped so the warm air reaches your rooms instead of the crawl space.
More on Duct Sealing
Crawl Space Encapsulation
The full version of a vapor barrier: a reinforced liner sealed to the floor and walls, foundation vents closed, rim joists sealed and humidity held in a safe range year-round.
More on Encapsulation
Sump Pumps & Drainage
Where groundwater gets in, it has to be collected and pumped out first. Basins, pumps, check valves, discharge lines and interior drainage — installed before the insulation, not after.
More on Sump Pumps
Air Sealing
Insulation slows heat through a surface; it does very little about air moving straight past it. Sealing the leaks first is what makes the insulation perform the way the label says.
More on Air Sealing
30+
Years combined
Why It Matters
What Proper Insulation Actually Changes
In this part of Washington the problem is rarely extreme cold — it is persistent damp and long, grey heating seasons. A crawl space with bare soil pushes moisture up into the floor system every day of the year, and insulation that has absorbed that moisture stops working long before it looks bad.
Getting the assembly right — ground cover, air sealing, then the right insulation at the right depth — changes how the whole house feels:
- Warmer floors. The most immediate difference most customers notice.
- Lower heating bills. Less conditioned air lost through the floor and ceiling.
- Less moisture and odour. A sealed ground cover cuts the damp at the source.
- Better indoor air. Air from the crawl space ends up in your living space.
- Fewer pests. Clean, tight assemblies are far less attractive to rodents.
- Quieter rooms. Insulation dampens sound between floors and outside.
- Protected pipes. Insulated crawl spaces are far less prone to freeze-ups.
- Stronger resale. Documented insulation work is an easy inspection win.
Crawl Space Encapsulation
A Healthier Home Starts Underneath
Warm air rises through a house and pulls replacement air up from below. In a vented crawl space, that air comes off damp soil — and up to half the air on your main floor can start there. Encapsulation seals the crawl space off, so the air your family breathes starts clean and dry.
Cleaner Indoor Air
With the soil covered, vents closed and gaps sealed, the air rising into your living space no longer passes over bare dirt and damp, dusty insulation on its way in.
Healthy Humidity Levels
A sealed, dehumidified crawl space stays dry year-round. Keeping humidity in check makes it much harder for mould and mildew to take hold under your floors.
Easier On Allergies
Dust mites and mould spores thrive in damp air. A drier house can mean fewer triggers for family members with allergies or asthma.
No More Musty Smell
That earthy, musty odour in many older Northwest homes usually comes from the crawl space. Seal out the damp and the smell goes with it.
How It Works
Four Steps, No Surprises
Free On-Site Assessment
We come out, get into the crawl space or attic, photograph what is actually there, and measure existing insulation depth, moisture, ventilation and any rodent or water damage.
Clear Written Estimate
You get a clear written estimate for the whole job, with the scope of work explained in plain language — plus an honest note on anything we think can wait.
Removal & Preparation
Old material is bagged at the source and carried out. We clean debris, repair or replace vapor barrier, and correct the small issues that would shorten the life of the new insulation.
Install & Completion Photos
New insulation is installed to spec, supported properly, and photographed so you can see the finished work for yourself.
Our Work
Recent Projects
Real crawl spaces and attics from homes across Skagit, Whatcom, Whidbey Island, Snohomish and King County.
Fully insulated attic with sealed knee walls
Finished crawl space with new ground cover
Blown-in attic insulation at a measured depth
Garage walls and ceiling insulated end to end
Crawl space insulation around a vent opening
Deep blown-in insulation across an attic floor
New ground cover beneath a brick foundation
Insulated ductwork above a new ground cover
Recognised by homeowners and industry organisations
Materials we install
Customer Reviews
What Local Homeowners Say
I was referred to Israel from RGS via a mutual friend. He was down to earth, highly knowledgeable, and gave a very thorough inspection for a complete crawlspace overhaul.Jancarlo Perez — via Google
RGS is a real professional and thorough outfit. They came in and took care of my crawl space under the house. I had a flooding problem with the sump pump and drainage system that was in place. They revamped the whole drainage system.Art Schrock — via Google
I want to express my extreme happiness with all of the work and customer service I experienced with Kevin and Israel at RGS Crawl Space Insulation. Their expertise and professionalism was extremely helpful. I would HIGHLY recommend them for all of your Insulation needs. High Quality work at a reasonable price.Tracy Fuentes — via Google
Israel and his team have done several jobs for us over the years and we are always impressed with their skill, attitude and speed. He has worked with us to ensure we get any energy rebates available. He is the best in the business.Brittany Fuentes — via Google
I am impressed with the attention to detail. Done in a way that I felt they were doing their own home. The crawl space is so nice now. They also did insulation of attic and under floor. Great people and the communication was excellent.Anna Riel — via Google
Best service ever! They came to my Orcas Island house and took care of the crawl space. Thank you Israel & team!Patricia G — via Google
Where We Work
Areas We Serve
RGS Crawl Space Insulation LLC is based in Mount Vernon and covers five counties across Northwest Washington and the north Puget Sound.
- Skagit County
- Whatcom County
- Whidbey Island
- Snohomish County
- King County
Towns and cities include: Mount Vernon, Burlington, Sedro-Woolley, Anacortes, La Conner, Bellingham, Ferndale, Lynden, Blaine, Oak Harbor, Coupeville, Langley, Stanwood, Arlington, Marysville, Everett, Lake Stevens, Snohomish, Monroe, Edmonds, Lynnwood, Bothell, Kirkland, Redmond, Bellevue and Seattle.
Counties shaded in navy are inside our regular service area.
Good Questions
Insulation FAQs
How do I know my crawl space insulation needs replacing?
The usual signs are cold floors in winter, a musty smell in the house, rising heating bills, or insulation you can see hanging down between the joists. In Northwest Washington the most common cause is moisture: fiberglass that has absorbed water loses most of its R-value and will not recover. If batts are sagging, stained, compressed, or show rodent runs, they are no longer doing much for you.
What R-value should my crawl space and attic have?
Washington’s energy code targets roughly R-30 under the floor and R-49 in the attic for our climate zone. Plenty of homes in Skagit and Whatcom County were built to R-11 or R-19 and never upgraded. We measure what is there and tell you where you actually stand before quoting anything.
Do you remove the old insulation, or just add on top?
It depends on the condition. Dry, intact attic insulation can often be topped up. Anything wet, mouldy, rodent-contaminated, or falling out of the joists has to come out first — adding new material over failed insulation traps the problem and wastes your money. We will tell you plainly which situation you are in.
How long does a typical job take?
It depends on the size of the home and the condition of the space. Larger homes, heavy rodent contamination or full vapor barrier replacement all add time. We give you a realistic timeline in the written estimate rather than a hopeful one.
Do you handle rodent damage and clean-up?
Yes. We remove contaminated insulation and debris, clean the area, and install new material. If there are active entry points we will point them out so they can be sealed — new insulation over an unsealed crawl space is a short-term fix.
Is the estimate really free?
Yes, and there is no obligation attached to it. We come out, look at the actual space, and give you a written number. Seniors or military households receive 5% off qualifying projects (one discount per project — they don’t stack).
Free Estimate
Ready for a Warmer, Drier Home?
Tell us what you are dealing with and we will come out, look at the actual space, and give you a written number. No obligation, no sales pitch.
Call or text(425) 319-2029Request Your Free Estimate
Same-day replies during business hours.