Crawl Space Encapsulation Services

Crawl Space Encapsulation

Crawl space encapsulation is a comprehensive solution aimed at creating a semi-atmosphere by sealing off the crawl space from the outside environment. At Northwest crawl space services, we offer professional crawl space encapsulation services designed to address moisture issues, improve indoor air quality, and enhance energy efficiency.

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Transform your crawl space into a clean, dry, and healthy environment with our professional encapsulation services. Contact Northwest crawl space services today to schedule a consultation and take the first step toward improving your home’s indoor air quality and energy efficiency.

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(888) 246-5837

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When is Crawl Space Encapsulation Needed?

Natural Excessive Moisture

Some crawl spaces experience excessively high moisture levels, even with proper ventilation. Excessive humidity can lead to condensation buildup, risking damage to wires, insulation, air ducts, and structural wood. Encapsulation is crucial in such cases to prevent mold, mildew, and structural damage.

Health Issues and Allergies

Encapsulation can benefit individuals with sensitive immune systems or allergies. By sealing the crawl space and covering the ground and walls with heavy-duty plastic, the amount of dirt and dust entering your home is significantly reduced, leading to improved indoor air quality.

Benefits of Crawl Space Encapsulation

Mold and Mildew Prevention

Controlling humidity levels prevents the growth of mold and mildew, which can be harmful and expensive to remove.

Increased Energy Efficiency

Encapsulation protects the crawl space from extreme temperatures, reducing energy consumption and preventing HVAC system strain.

Preventing Pest Infestation

A properly encapsulated crawl space minimizes the risk of pests such as spiders, bugs, and ants infiltrating your home.

Improved Air Quality

Encapsulation reduces the amount of dust and eliminates musty odors, resulting in improved indoor air quality.

The Encapsulation Process

Cleaning and Sanitizing

We start by thoroughly cleaning and sanitizing the crawl space to remove debris, mold, mildew, and other contaminants.

We seal off entry points and implement measures to prevent rodents from accessing the crawl space.

Identifying and sealing gaps, cracks, and openings in the crawl space to prevent air leakage and moisture infiltration.

Installing r10 2” Foam board insulation along the perimeter (stem walls) of the crawl space to provide thermal protection and prevent heat loss.

A durable 20 mil thick vapor barrier is installed to cover the ground and walls of the crawl space, creating a moisture barrier.

We install a dehumidifier to regulate humidity levels and maintain optimal moisture control within the encapsulated crawl space.

Installing a vinyl tube to safely route condensation from the dehumidifier to a designated drain point.


Northwest Crawl Space Services is family-owned right here in the Pacific Northwest. With years of experience, we’re licensed and bonded and always prioritize our customer’s satisfaction. Please read some of our 5-star reviews from our happy customers.

Myong Soo Kim
Myong Soo Kim
9 March 2023
Exceed their promises..excellent communication and great crew. Highly recommend.
Thomas Roberts
Thomas Roberts
9 March 2023
Rob and crew from NW Crawl Space did full remediation for our crawl space and attic, after finding evidence of rodents (mice) in both areas. Removed old crawl space insulation & vapor barrier, replaced heat-ducts that were damaged, & vacuumed out attic insulation and debris. Sealed openings in both areas to prevent rodents from returning. Traps set, with rodent control plan. Highly recommended!
Emily Davis
Emily Davis
3 March 2023
Northwest Crawl Space Services has been honest, professional, easy to work with, and has done excellent work on my home. I first approached the company looking for someone to reinsulate and clean out my mud room crawlspace-- it is an addition to the house and is open-air. Lior came by and noted that because NWCSS specializes in fiberglass insulation, they wouldn't be able to work on this part of my house, because it would require spray foam insulation to truly be rat and weather proofed. I really appreciated this up front honesty-- two previous contractors had given me bids to reinsulate with fiberglass, never mentioning the need for spray foam, and never saying that they wouldn't be able to do a proper job. I would have paid money to some other company for a shoddy, inappropriate "solution" if Lior had not filled me in. Lior even recommended some other companies to call that specialize in spray foam! After this helpful and informative experience, I knew right away when I discovered signs of rats in my main basement crawlspace that I wanted NWCSS to be the ones to work on the problem. Lior came by to check it out and did a very thorough inspection. His manner with clients is excellent-- I never felt like my questions were being dismissed. We set a date for a crew to come by to replace rat-infested insulation, remove the improperly installed vapor barrier, clean out debris, and reinstall vapor barrier to industry standards. The crew, Patrick and Chandler, were friendly, polite, and happy to answer questions. Savannah in the office has also been very friendly and quick to answer my questions regarding logistics and payment. Overall, my experience was excellent and I will re-hire NWCSS when it comes time to reinsulate and clean out my attic crawlspace.
jan ostrovsky
jan ostrovsky
6 February 2023
Matan gave us a fair estimate for the crawl space re-insulation and screening, and the work was done promptly. I was pleasantly surprised when the final bill came in about 15% UNDER the estimate. It’s nice to deal with a company which has the integrity to pass those savings on.
Dan Huang
Dan Huang
26 January 2023
Northwest Crawl Space is a trustful company to work with. They helped me install the French drain, replace the insulation and vapor barrier. Matan and his stuff did a great job. They will carefully protect your home when performing the job, clean the waste after the work is done, and come back to inspect if the work is good.
Scott Taylor
Scott Taylor
17 December 2022
We had Northwest crawlspace come out to inspect our crawlspace and they identify a lot of standing water as well as rodent activity in the insulation. As a result, we needed a full clean out of our crawlspace and new insulation, vapor barrier, drain and sump pump. The crew was professional, friendly and fast. The work was extremely well done, we recently had them come out to check everything and the technician confirmed it was one of the best installs he had seen. I would highly recommend this company to anyone.
Ricardo Salvatierra
Ricardo Salvatierra
16 December 2022
My experience with this company has been amazing. Lior (the owner) goes above and beyon every single aspect, super professional and always providing the best advice to avoid unnecessary expenses. They did the whole work in my crawlspace, sump pump, french drain, vapor barrier, etc... and results are great, 0 moisture. I would definitely recommend it.
Torrey Olsen
Torrey Olsen
15 December 2022
Lior and his NW Crawl Space Services team were everything we expected in professionals! They were on time, neat, though, communicative, polite, did the job as promised and then checked back with us as promised again to ensure that the job was done!
Wayne Appler
Wayne Appler
18 November 2022
I had Northwest Crawl Space Services remove all my rodent infested insulation and vapor barrier. They cleaned & disinfected my crawl and installed all new insulation and a sealed vapor barrier. The workers were very diligent and and skilled in their methods. I was given a quote up front and feel that I received a quality job that was worth every penny. I am beyond pleased with the company and would highly recommend them to everyone.

Frequently asked questions

What is crawl space encapsulation, and how does it work?

rawl space encapsulation involves sealing off the crawl space from the outside environment to create a semi-conditioned space. This process typically includes installing a vapor barrier on the ground and walls, insulating the crawl space, sealing air leaks, and controlling moisture levels. Encapsulation works by preventing moisture intrusion, improving indoor air quality, and enhancing energy efficiency.

Crawl space encapsulation is necessary when there are moisture issues in the crawl space, such as high humidity levels, condensation, or water intrusion. It is also recommended for homes with poor indoor air quality, structural damage caused by moisture, or a desire to improve energy efficiency. A professional assessment can determine if encapsulation is needed for your crawl space.

Some of the benefits of crawl space encapsulation include mold and mildew prevention, increased energy efficiency, prevention of pest infestation, improved indoor air quality, and protection of structural integrity. Encapsulation creates a cleaner, healthier, and more comfortable living environment while also helping to lower energy bills.

The duration of crawl space encapsulation depends on various factors, including the size of the crawl space, the extent of existing moisture issues, and the specific encapsulation techniques used. On average, encapsulation projects can take anywhere from one to several days to complete. Our team works efficiently to minimize disruption and complete the encapsulation process as quickly as possible.

Crawl space encapsulation can potentially increase your home’s resale value by improving its overall condition and addressing common issues such as moisture problems, mold growth, and poor indoor air quality. Homes with encapsulated crawl spaces may also be more attractive to buyers due to the added benefits of energy efficiency and structural protection.

While some aspects of crawl space encapsulation, such as installing a vapor barrier, may be possible to do as a DIY project, it’s generally recommended to hire a professional for comprehensive encapsulation. A professional contractor has the expertise, specialized equipment, and experience to properly assess the crawl space, address underlying issues, and implement effective encapsulation solutions tailored to your home’s needs.

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Fill out this form and we will contact you within 24 hours.