Get matched with top basement waterproofing pros in Flagstaff, AZ

Q: Do you need crawl space vents for encapsulation?

• <div><p>Encapsulation can take the place of crawl space vents since it protects the area from moisture and air all year round. Determining whether you should <a href="https://www.angi.com/articles/crawl-space-vents-opened-or-closed.htm">open or close crawl space vents</a> can be complicated since it often depends on the weather and humidity. Skip this step by investing in crawl space encapsulation whenever possible.</p></div>

Q: Is it safe to live in a house with foundation problems?

• <div><p>In most cases, it is safe to live in a home with minor foundation problems, but you should not let the issues persist. Virtually all foundations have small cracks from normal settlement, which are not a structural concern but should be sealed to prevent water intrusion. However, major damage&mdash;such as large structural cracks, sinking foundations, or bulging walls&mdash;can make a home unsafe. Other issues that can pose safety and health risks include poor indoor air quality from mold or pests, uneven floors, and rotten beams or joists. It is always best to have a foundation repair expert or structural engineer inspect any issues to determine if your home is safe to live in.</p></div>

Q: What are the disadvantages of a crawl space?

• <div><p>Some disadvantages of crawl spaces are mostly regarding the air itself&mdash;moisture build-up and poor ventilation, which can cause problems both in the house and underneath it, even damaging the foundation itself. Crawl spaces are difficult to access and often invite unwanted pests during the hot summer months and the cold winter ones. These hard-to-seal spaces are also susceptible to water damage during periods of heavy rain or melting snow.</p></div>

Q: What is the best basement ventilation system?

• <div><p>The best type of basement ventilation system depends on your budget, the moisture in your basement&rsquo;s air, and the types of windows you have down there. You should consider all of these factors when choosing a ventilation system. However, the most effective method for basement ventilation is an energy recovery ventilator (ERV) or a whole-house ventilation system, which preheats or precools incoming air from the outside while also managing water vapor.</p></div>

Q: Is it better to have a vented or sealed crawl space?

• <div><p>It is better to have a crawl space that is tailored to the outside temperature, your needs, and the season. For example, it is much better to have a vented space when it&rsquo;s very hot outside and your AC bills are sky-high. Conversely, when the temperature drops and humidity rises, it is almost always better to have your vents shut and covered if possible. </p></div>

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Verified Reviews for Basement Waterproofing pros in Flagstaff, AZ

*The Angi rating for Basement Waterproofing companies in Flagstaff, AZ 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 Flagstaff, AZ 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 06, 2026

Reviewed in May 2026
Brother Pro did a great job staining our cabin and decks in Flagstaff! Their prep work was very detailed and thorough. The final job looks awesome!
Brothers Pro Painting LLC
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Reviewed in September 2025
Hired North Mountain Contracting to do an exterior power wash on my home &amp; driveway. They did an excellent job. Communication was clear &amp; they did exactly what they said they would do with no surprises. I would highly recommend them to others.
North Mountain Contracting
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Reviewed in June 2025
Patriotic Plumbing worked on my main drain line, and in my opinion could have done a much better job in a few areas:. I can't assess the workmanship at this time, but intend to hire another plumber to check their work as soon as I recover financially from this repair bill: 1) Planning:...
Patriotic Plumbing and Rooter, LLC
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Reviewed in April 2024
Losing half your house to water damage and having a very uncooperative insurance company is no picnic. But if you have to go through that disaster, do yourself a favor and have Daniel Daire, his don, and their team be your guide. Their ethics, integrity, and professionalism are beyond...
1-800 Water Damage of Prescott & North Scottsdale
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Reviewed in December 2023
I loved working with Jeremy! He was efficient and did beautiful work on a new floor in our basement. He painted and added trim work too that was done very well. He also put in a front door that looks great. I felt his prices were good for the work done. I’m planning to put his skills to use...
Eco Handy Construction LLC
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Reviewed in May 2023
We hired Dakotah Construction to repair our concrete garage floor and epoxy seal it. They were super communicative during the planning stage, discussing the details of the project and our options. We got a second opinion on the quote and we were very happy with the price. When the work was...
Dakotah Construction LLC
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Reviewed in September 2022
I have shopped a lot prior to selecting a right contractor for my basement remodeling project and came across G Good and sons LLC. Greg and his crew has transformed the basement space into really usable and nicely laid out place where we can spend more time hanging out and use it a home gym as...
G Good and Sons LLC
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Reviewed in July 2022
Good response time. Repair done on a Saturday morning. Has not yet rained so can not rate repair success. Mr. Leland called to check on the job later that day. He said he would guarantee the repair.
Leland Roofing
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Reviewed in February 2020
The workmen on our huge driveway paver project did a spectacular job! These guys just worked all day long, were polite, arrived early and stayed late. We loved the finished look of both our driveways so much, we hired them again to put in a paved walkway and steps Down to our outside basement...
Agassiz Landscape Group, LLC
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Reviewed in May 2015
They were very nice and professional, and kind enough to tell me that what I needed to solve my problem was a waterproofing specialist and not a plumber. Whenever I need a plumber company they would definitely be the ones I'd call.
American Service Specialists, Inc.
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Find Basement waterproofing pros in Flagstaff

Groundworks

5.0(

)

Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Flagstaff, AZ and surrounding areas

Approved (Corporate)

In business since 2000

Free estimates

Warranties offered

"Alex and Donavan were very thorough. Discovered more than what we called them for. We originally wanted information on sealing cracks to eliminate cricket infestation coming through cracks in stem wall. We were not interested in repairing foundation rebar which is typical in slab homes in AZ. They were knowledgeable and honest in their evaluation of our home."

+22

167 neighbors recently requested a quote

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City Plumbing & Rooter AZ, LLC

5.0(

)

Basement Drainage Channels - Install

Serving Flagstaff, AZ and surrounding areas

Approved

In business since 2022

Free estimates

Emergency services offered

"I can’t recommend City Plumbing and Rooter AZ enough. Paul went above and beyond when we really needed help. We were staying at an Airbnb for my brother’s bachelor party, and things went sideways fast after the restrooms got seriously overused. It was a stressful situation, especially after hours—but Paul showed up quickly without hesitation. He and his nephew got straight to work, handled everything efficiently, and clearly knew exactly what they were doing. What stood out most was how calm, respectful, and professional they were in a pretty chaotic moment. They didn’t waste time, didn’t overcomplicate things—just got it done. If you ever find yourself in a plumbing emergency, especially at the worst possible time, Paul is the guy you want to call. Reliable, responsive, and genuinely cares about helping people out."

29 neighbors recently requested a quote

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A-1 Concrete Repair & Waterproofing, LLC

4.9(

)

Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Flagstaff, AZ and surrounding areas

In business since 2017

Free estimates

Warranties offered

"Work was completed as scheduled. and stem wall repair looks good."

Response time2 days

Response rate98%

Recommended by100%of homeowners

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A-1 Concrete Repair & Waterproofing, LLC

4.2(

)

Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Flagstaff, AZ and surrounding areas

In business since 2017

Free estimates

Warranties offered

Our company was built on hard work, honesty, and integrity and we are proud to service our neighbors here in the valley of the sun. \n\nWe offer an array of professional concrete repair, foundation stem repair, and waterproofing services that include basement waterproofing, retaining wall waterproofing, balcony deck waterproofing, etc.\n\nHere at A-1 Concrete Repair & Waterproofing, we combine good old-fashioned customer service with modern experience and equipment. Giving you the peace of mind and reassurance that your concrete repair or waterproofing project will get completed right the first time around.

Response time3 days

Response rate97%

4 neighbors recently requested a quote

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Gresham Painting & Remodeling

4.2(

)

Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Flagstaff, AZ and surrounding areas

In business since 1989

Free estimates

Emergency services offered

"Contractor went beyond what was expected - highly recommend. Not the least expensive, but worth the extra if you want it done right.
"

Recommended by100%of homeowners

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Hampton Enterprise LLC

3.7(

)

Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Flagstaff, AZ 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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Carlos Plumbing Service

5.0(

)

Basement Drainage Channels - Install

Serving Flagstaff, AZ and surrounding areas

In business since 2020

Free estimates

Emergency services offered

"Professional job Clean knowledgeable workers Polite Offered informative information to complete job Reasonable"

Recommended by100%of homeowners

Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Flagstaff, AZ and surrounding areas

In business since 1982

Free estimates

Emergency services offered

"The two men were quick and efficient. They made sure that the cabinet was re-attached to studs. They sprayed Lysol under the sink to prevent spread of mildew."

Recommended by100%of homeowners

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Basement Waterproofing questions, answered by experts

Encapsulation can take the place of crawl space vents since it protects the area from moisture and air all year round. Determining whether you should open or close crawl space vents can be complicated since it often depends on the weather and humidity. Skip this step by investing in crawl space encapsulation whenever possible.

In most cases, it is safe to live in a home with minor foundation problems, but you should not let the issues persist. Virtually all foundations have small cracks from normal settlement, which are not a structural concern but should be sealed to prevent water intrusion. However, major damage—such as large structural cracks, sinking foundations, or bulging walls—can make a home unsafe. Other issues that can pose safety and health risks include poor indoor air quality from mold or pests, uneven floors, and rotten beams or joists. It is always best to have a foundation repair expert or structural engineer inspect any issues to determine if your home is safe to live in.

Some disadvantages of crawl spaces are mostly regarding the air itself—moisture build-up and poor ventilation, which can cause problems both in the house and underneath it, even damaging the foundation itself. Crawl spaces are difficult to access and often invite unwanted pests during the hot summer months and the cold winter ones. These hard-to-seal spaces are also susceptible to water damage during periods of heavy rain or melting snow.

The best type of basement ventilation system depends on your budget, the moisture in your basement’s air, and the types of windows you have down there. You should consider all of these factors when choosing a ventilation system. However, the most effective method for basement ventilation is an energy recovery ventilator (ERV) or a whole-house ventilation system, which preheats or precools incoming air from the outside while also managing water vapor.

It is better to have a crawl space that is tailored to the outside temperature, your needs, and the season. For example, it is much better to have a vented space when it’s very hot outside and your AC bills are sky-high. Conversely, when the temperature drops and humidity rises, it is almost always better to have your vents shut and covered if possible.

The Flagstaff, AZ homeowners’ guide to basement waterproofing services

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

See all articles

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What Is Basement Waterproofing and How Does It Work?
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How to Keep Your Basement Dry and Get Rid of Moisture
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•
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Unearth the root causes of water seepage in your basement floor. Explore effective solutions to keep your basement dry and your home protected.