
Crawl Space Encapsulation
Reinforce your home from the ground up with Capitol Duct.







When I called to raise this, they denied any responsibility and offered excuses for why their air-hose method wouldn't have caught it — while refusing to remove it now except as a new, separately paid job. Whatever the brush's origin, their original service demonstrably failed to clear the duct.
I agreed to pay again anyway, just to get it resolved. I was told a manager would call me first to discuss it. No one called. I waited for the scheduled technician instead; no one showed. When I followed up, I learned the office had canceled the appointment without telling me.
I rescheduled a third time, and to avoid any confusion, I emailed a photo of the brush along with the access details (about 10 feet in, no crawlspace) and asked them to confirm they could do the job at the agreed price. The email went unanswered. When I called, I was assured the office had seen it, reviewed the photo, and confirmed the job and price.
Two weeks later, the technicians arrived — 90 minutes early, before I was ready — with no idea they were there to remove a stuck brush. After using about 15 minutes of my time, they concluded they couldn't remove it after all. I told them to leave and hired someone else.
Across three separate appointments and every point of contact — the initial cleaning a year ago, the manager callback, the scheduled visit, the confirmed job — Capitol Duct Cleaning did not follow through on a single commitment it made. I won't use them again.



In general, every person I've talked to or had out has been kind, courteous, knowledgable and really stepped up. For example, my air return wasn't installed quite right (tract homes), and the tech went and reworked the sheet metal and fixed a problem that was not even theirs. Just free of charge, just pride in work stuff.
Then we all learned that the builder didn't tighten the wires into the control board, so the cleaning vibrated it out and my heat pump went offline. Same time, a burning dust smell in a bathroom kind of lingered (builder left vents open/running during construction.) This time, the head dude himself comes out, they hook it all up, re-clean the entire system for good measure, and my price? Zero. They just did it.
I'll say too, I'm not an HVAC guy but I've worked around construction enough to know when people care, and I'm telling you, these guys are the people you want working on your house.






First, the good: Both Dominick and Quentin, the techs, were great. Very polite and thorough. And Adam, the owner, was very nice and quickly addressed my concerns when the work I expected wasn't done during the first visit.
Now, the not-great: I initially called for professional dryer vent cleaning when I saw lint build-up beyond my lint filter and couldn't reach it with my vacuum. But I quickly learned from the first tech that cleaning from the dryer's lint filter to the wall isn't included in their service. For an industry whose entire existence is based on the threat of dryer lint building up and causing a fire, it's weird to me that this business only addresses PART of the threat. When I spoke with the owner about this, to his credit, he eventually agreed to send a second tech out to provide that service at no extra charge.
The other bad is not that it took 4 business days to get this resolved, as I think that's a pretty reasonable timeframe. No, it's the fact that I've received 3 texts and 1 email since the 1st visit begging for a review. I don't need to be hounded daily (esp before the work is complete) to provide a review. And I don't need to be told that the techs' bonuses depend on getting a five-star review.
In the end, the work was performed well and the price seemed reasonable. But the bumps along the way were annoying.










I highly recommend Capitol Duct Cleaning, especially if you’re lucky enough to get Larry and Q. Outstanding service from start to finish!






I highly recommend this company!

We confidently refer our clients to Capitol Duct knowing they’ll receive exceptional service every time. Whether residential or commercial, we highly recommend reaching out to their team.




I also want to thank the front desk team, especially Amy and her co-worker. Because of my kids’ school event, they went out of their way to accommodate my schedule. I can’t thank them enough for their flexibility and kindness.
Overall, I’m extremely satisfied with the service. Highly recommended!







The team came out to clean our ductwork and dryer vent, and they did a thorough, professional job from start to finish. They were polite, genuinely friendly, and took the time to explain every step of the process, answering all our questions with patience. They also sanitized the system and gave helpful, non-pushy recommendations for maintaining clean indoor air. We immediately noticed a difference in air quality. Highly recommend!


Helps block moisture and mold
Keeps pests out
Supports cleaner indoor air
Protects structural wood

What is Crawl Space Encapsulation?
Most people don’t think about their crawl space until it starts causing problems. Damp air, musty smells, mold, and pests often start down below without much warning. With encapsulation, you seal the space to help stop those issues from spreading into your home.
This isn’t just about covering dirt floors. We install heavy-duty vapor barriers and seal up vents and entry points. The goal is simple: keep the outside out and help your home breathe easier.
Keep Pests and Moisture Out
Rodents, insects, and mold love a damp, dark crawl space
By sealing gaps and laying down a proper moisture barrier, we make it a lot less welcoming.
Reviews







When I called to raise this, they denied any responsibility and offered excuses for why their air-hose method wouldn't have caught it — while refusing to remove it now except as a new, separately paid job. Whatever the brush's origin, their original service demonstrably failed to clear the duct.
I agreed to pay again anyway, just to get it resolved. I was told a manager would call me first to discuss it. No one called. I waited for the scheduled technician instead; no one showed. When I followed up, I learned the office had canceled the appointment without telling me.
I rescheduled a third time, and to avoid any confusion, I emailed a photo of the brush along with the access details (about 10 feet in, no crawlspace) and asked them to confirm they could do the job at the agreed price. The email went unanswered. When I called, I was assured the office had seen it, reviewed the photo, and confirmed the job and price.
Two weeks later, the technicians arrived — 90 minutes early, before I was ready — with no idea they were there to remove a stuck brush. After using about 15 minutes of my time, they concluded they couldn't remove it after all. I told them to leave and hired someone else.
Across three separate appointments and every point of contact — the initial cleaning a year ago, the manager callback, the scheduled visit, the confirmed job — Capitol Duct Cleaning did not follow through on a single commitment it made. I won't use them again.



In general, every person I've talked to or had out has been kind, courteous, knowledgable and really stepped up. For example, my air return wasn't installed quite right (tract homes), and the tech went and reworked the sheet metal and fixed a problem that was not even theirs. Just free of charge, just pride in work stuff.
Then we all learned that the builder didn't tighten the wires into the control board, so the cleaning vibrated it out and my heat pump went offline. Same time, a burning dust smell in a bathroom kind of lingered (builder left vents open/running during construction.) This time, the head dude himself comes out, they hook it all up, re-clean the entire system for good measure, and my price? Zero. They just did it.
I'll say too, I'm not an HVAC guy but I've worked around construction enough to know when people care, and I'm telling you, these guys are the people you want working on your house.






First, the good: Both Dominick and Quentin, the techs, were great. Very polite and thorough. And Adam, the owner, was very nice and quickly addressed my concerns when the work I expected wasn't done during the first visit.
Now, the not-great: I initially called for professional dryer vent cleaning when I saw lint build-up beyond my lint filter and couldn't reach it with my vacuum. But I quickly learned from the first tech that cleaning from the dryer's lint filter to the wall isn't included in their service. For an industry whose entire existence is based on the threat of dryer lint building up and causing a fire, it's weird to me that this business only addresses PART of the threat. When I spoke with the owner about this, to his credit, he eventually agreed to send a second tech out to provide that service at no extra charge.
The other bad is not that it took 4 business days to get this resolved, as I think that's a pretty reasonable timeframe. No, it's the fact that I've received 3 texts and 1 email since the 1st visit begging for a review. I don't need to be hounded daily (esp before the work is complete) to provide a review. And I don't need to be told that the techs' bonuses depend on getting a five-star review.
In the end, the work was performed well and the price seemed reasonable. But the bumps along the way were annoying.










I highly recommend Capitol Duct Cleaning, especially if you’re lucky enough to get Larry and Q. Outstanding service from start to finish!






I highly recommend this company!

We confidently refer our clients to Capitol Duct knowing they’ll receive exceptional service every time. Whether residential or commercial, we highly recommend reaching out to their team.




I also want to thank the front desk team, especially Amy and her co-worker. Because of my kids’ school event, they went out of their way to accommodate my schedule. I can’t thank them enough for their flexibility and kindness.
Overall, I’m extremely satisfied with the service. Highly recommended!







The team came out to clean our ductwork and dryer vent, and they did a thorough, professional job from start to finish. They were polite, genuinely friendly, and took the time to explain every step of the process, answering all our questions with patience. They also sanitized the system and gave helpful, non-pushy recommendations for maintaining clean indoor air. We immediately noticed a difference in air quality. Highly recommend!



Why Choose Capitol Duct for Crawl Space Encapsulation?
Encapsulation isn’t a quick DIY project. It takes experience and attention to detail. That’s where we come in. We’ve handled all kinds of crawl spaces, and we keep the process clear and honest from the start.
When you trust us with your crawl space encapsulation, we’ll walk you through what needs to be done and keep you updated with before-and-after photos.
How does our process work?
Schedule a free inspection
We take a look inside your crawl space to confirm whether encapsulation is the right solution. If moisture or damage is present, we’ll talk you through your next steps.
1.After approval and deposit, we get to work
Our team arrives on time, sets up a clean perimeter around the crawl space entry, and gets to work sealing it off. You’ll get a fully enclosed, moisture-blocking barrier and peace of mind.
2.
Contact Us
Phone: 360-352-4693Open Hours
Weekdays
24 Hours
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FAQ
- Is Crawl Space Encapsulation Available?
- How Does Encapsulation Help With Air Quality?
- What Are The Long-Term Benefits?
- Will This Stop Rodents Completely?
- Does It Help With Odors?
Is Crawl Space Encapsulation Available?
Yes. We install a thick vapor barrier and seal any accessible entry points. This helps block moisture, limit mold growth, and reduce allergens in your home’s air.
How Does Encapsulation Help With Air Quality?
Moisture and mold often travel up from your crawl space. Sealing it can help keep the air in your home cleaner and make things easier on your HVAC system.
What Are The Long-Term Benefits?
A sealed crawl space reduces mold risk, helps protect wood structures, and makes your home more energy-efficient. It also keeps pests from sneaking in through vents or gaps.
Will This Stop Rodents Completely?
Encapsulation blocks off common entry points. While it can’t guarantee total rodent control, it makes your crawl space much harder to access.
Does It Help With Odors?
Yes. We include an antibacterial and antiviral spray to help eliminate odor-causing bacteria during the encapsulation process.