Attics and crawl spaces are some of the most overlooked areas in a home—yet they have a huge impact on energy efficiency, air quality, and overall comfort. In Western Washington, moisture, rodents, mold, and old insulation are extremely common issues, especially in older homes or homes surrounded by trees.
If you’ve been told you need an attic or crawl space cleanout, you might be wondering:
“What actually happens during the sanitation process?”
“What does a cleanout include?”
“Is it really necessary?”
At Insulation Co. LLC, we specialize in full attic and crawl space restoration. Below, we break down exactly what happens during a professional cleanout so homeowners know what to expect.
Why Attic & Crawl Space Sanitation Matters
These areas often accumulate years of:
• Rodent droppings
• Contaminated insulation
• Mold growth
• Moisture damage
• Odors
• Debris from construction or previous homeowners
Because up to 40% of the air in your home comes from the crawl space or attic, sanitizing these areas is essential for maintaining a healthy indoor environment.
Step 1: Inspection & Documentation
Before any work begins, our technicians:
• Perform a visual inspection of the attic & crawlspace
• Identify rodent activity, entry points, mold, moisture, and damaged insulation
This step ensures you know exactly what’s happening in the hidden parts of your home.
Step 2: Removal of Contaminated Materials
This is where the real cleanout begins.
We remove:
• Old insulation (fiberglass, cellulose, Rockwool)
• Rodent nests & droppings
• Damaged vapor barrier
• Debris & construction waste
• Old duct insulation
• Moist or moldy materials
Everything is bagged and safely removed from your property to prevent contamination inside your home.
Step 3: Rodent Exclusion (Air Sealing & Entry-Point Sealing)
One of the most important steps during a cleanout is preventing future infestations.
Our team seals:
• Plumbing & electrical penetrations
• Gaps along sill plates
• Vents with damaged screens
• Foundation cracks
• Openings in crawl space doors
• Roofline gaps, soffits, and gable vents (for attic projects)
This stops rodents from re-entering and protects your new insulation.
Step 4: Sanitation & Decontamination
After removal, we sanitize the entire area using professional-grade products that neutralize:
• Odors
• Bacteria
• Urine
• Feces
• Mold spores
• Pathogens commonly found in rodent infestations
This restores a safe, clean environment beneath your home.
Step 5: Mold Treatment (If Needed)
If any mold is found on wood framing or insulation surfaces, we:
• Treat affected areas with EPA-registered mold remediation solutions
• Scrub or wipe down framing
• Ensure ventilation and moisture sources are addressed
Western Washington’s moisture levels make mold remediation a common part of cleanouts.
Step 6: Moisture Control Solutions
If moisture is present, we may install:
• New vapor barrier
• Sump pump
• French drain system
• Regrading of the crawl space soil
• Ventilation improvements (attics & crawl spaces)
Moisture is the #1 cause of mold, wood rot, and insulation failure.
Step 7: New Insulation Installation
After cleaning, sanitizing, sealing, and treating the space, we install:
Attic:
• Blown-in fiberglass or cellulose
• Batts in specific areas
• Attic air seal (required for PSE & PUD rebates)
Crawl Space:
• Floor insulation
• New vapor barrier
• Duct insulation
This improves energy efficiency, comfort, and air quality throughout your home.
Step 8: Final Cleanup & Before
We finish by:
• Cleaning up all work debris
• Removing protective coverings from your floors
You end up with a clean, healthy, energy-efficient attic or crawl space.
How Do You Know If You Need a Cleanout?
You likely need a clean out if you notice:
• Musty odors
• Rodent droppings or noises
• High energy bills
• Cold floors or hot attic areas
• Moisture or standing water
• Mold growth
• Insulation falling or missing
If you’re unsure, we offer free estimates, so you know exactly what’s going on.
Transform Your Home From the Inside Out
A professional attic or crawl space cleanout doesn’t just look better—it makes your home healthier, more energy-efficient, and more valuable. At Insulation Co. LLC, we’ve restored thousands of homes across Western Washington and know exactly what to look for in our climate.
Ready to clean up and restore your attic or crawl space?
Get a free estimate today.
425-529-4979
InsulationCo.com
