Does basement insulation need a vapor barrier?

• <div><p>Yes, basement insulation needs a vapor barrier due to its susceptibility to moisture seeping in from the outside of the house. You should install a moisture barrier before you <a href="https://www.angi.com/articles/how-to-install-insulation.htm">install insulation</a> or purchase insulation that comes prebuilt with a moisture barrier to avoid water damage in your insulation and costly mold and water remediation expenses. </p><p> </p></div>

Get matched with top basement waterproofing pros in Roundup, MT

Q: Is it okay for a crawl space to be wet?

• <div><p>No, you don&rsquo;t want your crawl space to be wet because water and even moisture in the air under your home can attract insects and rodents, decrease your indoor air quality, increase your energy bills, promote mold growth, and even lead to structural damage. If you notice any signs of water or humidity in your crawl space, you should get the issues addressed immediately by contacting a professional. They can remove moisture and will know <a href="https://www.angi.com/articles/how-to-waterproof-your-basement.htm">how to waterproof your basement</a> to prevent ongoing problems. </p></div>

Q: How do I get rid of moisture under my elevated deck?

• <div><p>If you notice standing water under the deck after rainstorms, you may need a drainage system to efficiently move this water. You do not want standing water to rest against your foundation or against support posts for the deck, as this could cause significant structural problems over time. Make sure the area has proper grading, too.</p></div>

Q: What are signs of a moisture problem in the bathroom?

• <div><p>Mold growth is just one common sign of excess moisture in the bathroom. You may also see the paint in the room start to peel away from the walls, or that the walls remain wet for some time after you bathe.</p><p>Condensation on the windows is another sign that your bathroom has a potential moisture problem. The room itself may start to smell like mildew.</p></div>

Q: Should you put plastic over insulation in basement walls?

• <div><p>A plastic vapor barrier should completely cover your basement to prevent water from penetrating through the walls. This typically goes before installing insulation to prevent moisture from building up and becoming trapped on the inside of your insulation, where it can collect and lead to mold damage. Installing insulation after the vapor barrier allows for any moisture to exit the walls for better ventilation.</p></div>

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Verified Reviews for Basement Waterproofing pros in Roundup, MT

*The Angi rating for Basement Waterproofing companies in Roundup, MT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Basement Waterproofing needs.

*The HomeAdvisor rating for Basement Waterproofing companies in Roundup, MT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Basement Waterproofing needs.

Last update on May 31, 2026

Reviewed in May 2026
Still waiting for an estimate so I can get financing
CREEKSIDE CUSTOM CONSTRUCTION LLC
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Reviewed in August 2025
The kitchen remodel was completed as promised no issues company was there when they said they?d be there. He made my dream kitchen come to life. Definitely highly recommend him.
406 Baker, LLC
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Reviewed in June 2023
Prompt and estimates are accurate and reasonable. explains things clearly and we have always been very pleased with his work.
Spartan Gutter Guards
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Reviewed in January 2021
If you want good honest work, this is who you need use. They were great!
Elk Country Builders, LLC
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Reviewed in April 2020
Carolyn was an absolute blessing to work with. She is a dynamic individual who knows her business, and is vested in giving you a quality product. My work experience is varied, and in one conversation Carolyn was able to pinpoint the focus for my resume. I now have a professionally crafted...
Carolyn's Creative Resumes
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Reviewed in March 2020
Prompt, courteous just a great company all together. You won t be sorry if you hire them for your service.
Cscapes
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Reviewed in January 2020
Excellent. Wilbur and Mike were very responsive. They finished work that was started by another contractor and made it look seamless. Mike has a great personality. I really enjoyed talking to him. He listened !! Analysed the problem and took action. I will never go with another roofing company.
Sprague Construction Roofing, LLC
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Reviewed in January 2019
They were friendly from the beginning, sent experienced professional installers and did a great job.
Billings Window & Door
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Reviewed in January 2019
The salesman was great to work with and kept in contact. The installers were friendly, fast and did a great job. They even worked in the cold and stayed late to finish. I was impressed with this company and was glad we chose them to repair the hail damaged metal siding on our house.
Big Sky Exterior Designs Inc
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Reviewed in January 2019
We got an immediate response, they did the job right away & they did a great job. Owner was very friendly and professional. We highly recommend them.
Gutter Done
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Find Basement waterproofing pros in Roundup

Groundworks

4.3(

)

Serving Roundup, MT and surrounding areas

Approved (Corporate)

In business since 2010

Free estimates

Warranties offered

"we had concrete pads added after home construction. One pad had a 2 inch settlement on one corner. Complicating this was a stone wall sitting atop the pad. Excellent restoration was done by Groundworks From Bozeman. After a thorough evaluation by Ben, Chelsea and Tyler were prompt, educational and successful. I Highly recommend this company for your concrete/foundation needs."

+16

Response time2 days

34 neighbors recently requested a quote

Recommended by72%of homeowners

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Hampton Enterprise LLC

3.7(

)

Serving Roundup, MT and surrounding areas

In business since 1989

Free estimates

Emergency services offered

"I only use James when I need some work done to my house. He responds fast, gets the work done quicker than just about anyone else I've ever used and seems very concerned with leaving his customers happy."

Recommended by60%of homeowners

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Basement Waterproofing questions, answered by experts

No, you don’t want your crawl space to be wet because water and even moisture in the air under your home can attract insects and rodents, decrease your indoor air quality, increase your energy bills, promote mold growth, and even lead to structural damage. If you notice any signs of water or humidity in your crawl space, you should get the issues addressed immediately by contacting a professional. They can remove moisture and will know how to waterproof your basement to prevent ongoing problems.

If you notice standing water under the deck after rainstorms, you may need a drainage system to efficiently move this water. You do not want standing water to rest against your foundation or against support posts for the deck, as this could cause significant structural problems over time. Make sure the area has proper grading, too.

Yes, basement insulation needs a vapor barrier due to its susceptibility to moisture seeping in from the outside of the house. You should install a moisture barrier before you install insulation or purchase insulation that comes prebuilt with a moisture barrier to avoid water damage in your insulation and costly mold and water remediation expenses.

Mold growth is just one common sign of excess moisture in the bathroom. You may also see the paint in the room start to peel away from the walls, or that the walls remain wet for some time after you bathe.

Condensation on the windows is another sign that your bathroom has a potential moisture problem. The room itself may start to smell like mildew.

A plastic vapor barrier should completely cover your basement to prevent water from penetrating through the walls. This typically goes before installing insulation to prevent moisture from building up and becoming trapped on the inside of your insulation, where it can collect and lead to mold damage. Installing insulation after the vapor barrier allows for any moisture to exit the walls for better ventilation.

The Roundup, MT homeowners’ guide to basement waterproofing services

From average costs to expert advice, get all the answers you need to get your job done.

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