Crawl Space Encapsulation
Reinforce your home from the ground up with Capitol Duct.
5.0
Based on 798 reviews
powered by Google
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
5.0
Based on 798 reviews
powered by Google
Patty
01:31 08 Jan 26
Capitol duct cleaning is a good company to work with. Their employee, Brett, did a wonderful job and was very knowledgeable.
1strate Source
22:06 06 Jan 26
Friendly anf ver helpful. He finisg the job fast and flawlessly.
wshewey1
20:23 06 Jan 26
wshewey1
20:23 06 Jan 26
Christina McPherson
20:08 06 Jan 26
Christina McPherson
20:08 06 Jan 26
Chad O'Bara
02:44 03 Jan 26
Quick, efficient, and great customer service!
Brian Moore
20:45 02 Jan 26
I had my air ducts cleaned Capitol Duct Cleaning’s tech(s) Daishaun N. And Lucas B. They were a group of young professionals who did an outstanding job. They took the time to explain what they were doing as they worked. I appreciated that as a customer. They were both patient with all my questions. I will definitely use them again. It was a great experience.
Ingrid Farrior
00:02 23 Dec 25
Dominick was on time for duct cleaning, respectful of my home, and very thorough. He answered every question to my understanding and explained every detail. I am happy with the service, and have already recommended Capital Duct Cleaning to my friends on the same day. The charge is below of their competitor’s’ bids.
Sarah Westervelt
00:15 16 Dec 25
Brett with Capital Duct Cleaning installed a 4-in filter box on our furnace. Once again, he was highly skilled, fantastic with sharing information and educating us, very thorough with craftsmanship and cleaning up afterwards, and very kind. I would highly recommend this company for all kinds of work on furnaces, after hour two experiences with them. I'm already recommending them to friends and neighbors.
Scott “Genius Polak” Longosky
01:43 09 Dec 25
The woman at the office that gave me my estimate was incredibly nice and very helpful. Setting up the service was equally pleasant. Dominick was our service tech and he was very polite, friendly, and informative. He informed us at every step how things were going and what the next step would be. Would highly recommend!
Jonny Flygare
22:48 18 Nov 25
I had an excellent experience with Capitol Duct Cleaning! Larry and Q were fantastic—professional, friendly, and extremely thorough. They took the time to explain everything they were doing, showed me before-and-after photos, and made sure the entire system was cleaned perfectly. You can tell they take pride in their work. My home already feels fresher, and the airflow is noticeably better.
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 Capitol Duct Cleaning, especially if you’re lucky enough to get Larry and Q. Outstanding service from start to finish!
Nelson Turner
23:13 17 Nov 25
Adam and Lucas were great!
Travis Linares-Hengen
18:37 15 Nov 25
Bean
20:46 14 Nov 25
Daishaun and Quintin were extemely efficient and friendly. Thanks so much!
Alan Binegar
19:39 12 Nov 25
They were quick and efficient, and provided photos of what they had done. I couldn’t be happier with the results and service!
Response from the owner 21:02 24 May 24
Thank you for taking time to leave us this great review Alan. We appreciate the opportunity to assist. 
Mindy Leikam
22:36 07 Nov 25
Very professional and friendly service!! Answered all questions I had and were so kind and considerate. Gave me information about my furnace that I needed. I will recommend your company to everyone we know.
Response from the owner 23:09 07 Nov 25
Thank you for sharing with us Mindy! We’re so glad to hear you had a positive experience with our team. Providing friendly, knowledgeable service and making sure our customers feel informed is always our goal. We truly appreciate your recommendation and look forward to helping you again in the future!
Alex Greenhouse
19:06 07 Nov 25
Every single person I spoke to from Capitol Duct Cleaning was fantastic. The person I talked to on the phone to schedule was very nice and encouraging and the technicians (Ross, Quintin and Larry) that came out were very helpful especially considering we didn't know much about the history of our house regarding duct work. They were able to get everything cleared out and cleaned out quickly and were very kind and personable while doing so!
I highly recommend this company!
I highly recommend this company!
Response from the owner 23:15 07 Nov 25
Thank you so much for your kind words! We're thrilled to hear that you had such a great experience with our team. Ross, Quintin, Larry, and our scheduling staff will be so happy to know they made a positive impression. We’re glad we could help get your ducts cleaned and everything running smoothly. We truly appreciate you choosing Capitol Duct and taking the time to share your experience!
Connor Smith
15:49 07 Nov 25
The team at Capitol Duct is truly second to none. As a fellow Contractor and local Veteran Owned Business, we’ve come to rely on them as our most trusted partner for all HVAC, duct, and furnace/A/C diagnostic needs. Their professionalism, responsiveness, and attention to detail are unmatched.
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.
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.
Response from the owner 17:56 07 Nov 25
Thank you for the kind words and for trusting our team! We’re proud to partner with a fellow Veteran-Owned business and truly appreciate your confidence and referrals. It’s always a pleasure working together!
R. Bruce Overman
23:53 05 Nov 25
Dryer duct was completely clogged. They came out the day after I called and had it open in an hour for what I thought was a reasonable fee. I will use them again.
Response from the owner 23:08 07 Nov 25
Thank you so much for your kind words! We’re glad we could get your dryer vent cleared quickly and that you were happy with our service and pricing. We appreciate you trusting Capitol Duct and look forward to assisting in the future. 
Leslie Martin
01:02 05 Nov 25
Wonderful job.
Response from the owner 20:34 05 Nov 25
Thank you for choosing Capitol Duct, Leslie. 
Mark Hermiller
00:26 05 Nov 25
Russ was on time and went to work! We had never had our air ducts cleaned previously. Based on the dirt built up in the blower motor we just had cleaned, it seemed logical to have the ducts cleaned as well. I was somewhat skeptical of the need to have it done but was pleasantly surprised by all the grime in the return air ducts. Not cheap but they did an A+ job!
Response from the owner 20:35 05 Nov 25
Thank you for sharing your experience, Mark! We’re glad to hear Ross took great care of you and that you were able to see the difference in the return duct system. It’s completely understandable to be unsure at first, especially if the ducts haven’t been cleaned before — we’re happy the results spoke for themselves. We truly appreciate the trust and the opportunity to help improve your home’s air quality. Thank you again for choosing Capitol Duct. 
June Wang
19:06 10 Jun 25
I would highly recommend this duct cleaning company! I truly appreciate the technician, Quintin, who came to my home—he did an outstanding job. From the moment he arrived, I could tell he was very professional. He wore shoe covers and brought high-quality, efficient equipment that provided a deep and thorough air duct cleaning. He also shared helpful knowledge and before-and-after pictures with me, which I really appreciated.
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!
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!
Kathi Jo Moore
18:25 10 Jun 25
Just had my dryer duct cleaned out! Andrew was on time, very pleasant, and got right to work with the cleaning. Thank you for your quick work making my dryer safe again!
sean harding
17:26 10 Jun 25
Andrew was great! Hard worker! Very knowledgeable! Capitol duct cleaning is a great company. I will continue to use them!
Anthony Schmidt
05:06 09 Jun 25
Matt S. did a great job installing rodent exclusion. No more squirrels in my attic crawlspace!
Response from the owner 22:50 09 Jun 25
Thank you so much for the kind review, Anthony! We're glad to hear that Matt S. did a great job with your rodent exclusion and that your attic crawlspace is now squirrel-free. We'll be sure to pass along your feedback to him. We appreciate your trust in our team and are here if you need anything in the future!
Tristin
20:50 06 Jun 25
Andrew was friendly and got the job done quickly. Thanks so much!!!
Response from the owner 22:51 09 Jun 25
Thank you for the great review Tristin! We're happy to hear Andrew was friendly and got the job done quickly. We’ll be sure to share your feedback with him. We appreciate your support and hope to work with you again in the future!
Garrett B
22:00 05 Jun 25
Andrew was awesome. Birds had gotten into our dryer exhaust and made several nests. He got it all cleaned out and sealed up. Fast efficient service .
Response from the owner 22:52 09 Jun 25
Thank you for sharing your experience Garrett! We're so glad Andrew was able to take care of the bird nests in your dryer exhaust and get everything cleaned out and sealed up properly. Fast and efficient service is what we aim for, and we’ll be sure to pass your kind words along to Andrew. Thanks again for choosing Capitol Duct. 
Jordan Pelton
20:37 05 Jun 25
Joe was great! Right on time and very professional. He never felt rushed and took time to clean each vent. Really appreciate it!
Response from the owner 22:53 09 Jun 25
Thank you for the awesome review Jordan! We're so glad to hear Joe was punctual, professional, and thorough with your vent cleaning. We truly appreciate your feedback and will make sure Joe hears how much his work meant to you. Thanks for trusting Capitol Duct. 
Nathaniel West
23:59 03 Jun 25
Absolutely outstanding service!
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!
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!
Response from the owner 17:48 04 Jun 25
Thank you so much for the amazing review, Nathaniel! We're excited to hear that you had such a positive experience with our team. Providing thorough, professional service while keeping our customers informed and comfortable is always our goal. We're glad you noticed an improvement in your air quality right away — that’s exactly what we aim for! Thank you for trusting Capitol Duct with your air system needs. We truly appreciate the recommendation, and don’t hesitate to reach out if you ever need anything in the future.
MGR ice
18:24 03 Jun 25
Thank you! Excellent service
Response from the owner 17:49 04 Jun 25
We love seeing 5-star reviews. Thank you MGR Ice. 
Bardon Enterprises, LLC
16:33 03 Jun 25
Thank you. We appreciate the service Joe performed at 7420 S Prospect St, Tacoma
Response from the owner 21:31 02 Jun 25
Thank you for trusting Capitol Duct with your air system needs. 
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
Sat/Sun
Closed
Contact Capitol Duct
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?
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?
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?
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?
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?
Does It Help With Odors?
Yes. We include an antibacterial and antiviral spray to help eliminate odor-causing bacteria during the encapsulation process.