House Foundation Repair & Basement Waterproofing in Longmont, CO

Does your home or commercial property have bowing foundation walls, sinking concrete slabs, or leaky windows in the basement? There is no reason to worry — Thrasher Foundation Repair is your trusted expert, providing solutions for these problems and so much more since 1975.

Contact Thrasher Foundation Repair to schedule a free inspection and cost estimate on any of our reliable services, including basement waterproofing, foundation repair, crawl space encapsulation, and concrete repair. We proudly serve Longmont, CO and nearby areas.

Testimonials From Longmont
Very grateful for the Thrasher team! Very impressed with their level of professionalism and their execution...
Testimonial by Jeremy L. from Longmont, CO
I can not express my gratitude enough! Thrasher was so professional and it is obvious they care about they...
Testimonial by Larry A. from Longmont, CO
The project went well and Dakota did a great job!
Testimonial by Gary D. from Longmont, CO
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Durable home foundation repairs in Longmont

No matter how small the foundation damage may seem, problems can worsen and impact other areas of a home or building, leading to issues like sticking windows and doors, cracked drywall, a tilting chimney, and moisture intrusion. From cracked foundation floors to bowing basement walls and foundation settlement, Thrasher Foundation Repair provides permanent solutions for these structural problems and more.

Home Foundation Problems We Fix:

  • Foundation settlement & sinking
  • Sticking windows & doors
  • Tilting chimneys
  • Tilting & bowing walls
  • Cracked foundation walls & floors
  • Collapsing retaining walls
  • Sagging crawl space
  • Uneven floors

Our House Foundation Repair Products:

  • Crawl space support posts
  • Push piers & helical piers
  • Wall anchors
  • Street creep repairs
  • Foundation wall brace & beams
  • Carbon fiber wall straps
  • Foundation settlement repair
  • Foundation crack repair

Schedule a free foundation inspection and service estimate to get personalized repair solutions for your property. We proudly serve Longmont and nearby areas in Colorado.

Lasting basement waterproofing system in Longmont

If your home or building has damp walls, excess condensation, mold, or other moisture intrusion problems, contact the basement waterproofing experts at Thrasher Foundation Repair.

We can eliminate basement flooding and leaking with a patented waterproofing system customized to suit any property, creating a dry below-grade space and keeping it that way for years to come! We proudly serve Longmont and nearby areas in Colorado.

Schedule a free basement waterproofing inspection and service estimate to learn more. We proudly serve Longmont and nearby areas in Colorado.

Our basement waterproofing system includes:

  • Interior drainage systems
  • Sump pumps
  • Mold treatment
  • Dehumidifiers

Crawl space repair & encapsulation services in Longmont

Do you have a musty, wet, and humid crawl space in your home or building? Don’t deal with the mess on your own. Contact the crawl space encapsulation and repair professionals at Thrasher Foundation Repair! We provide a suite of crawl space solutions designed to create a drier, more secure area, including a moisture-proof vapor barrier, crawl space doors, crawl space support jacks, and more.

Concrete repair & concrete leveling experts in Longmont

If you’re tired of sinking, cracked driveways, pool decks, sidewalks, or other concrete slabs around your property, contact the concrete repair professionals at Thrasher Foundation Repair. We offer simple, innovative solutions that are far superior to the standard mudjacking or concrete replacement. Our cracked concrete repair, concrete leveling, and concrete sealing systems install with no mess and no stress. Plus, they are quick to cure, so you can use your slabs soon after installation.

Never worry about UV rays, debris, gas, water, or other liquids ruining your slabs. Our solutions are incredibly durable and address the underlying cause of concrete damage, meaning you get lasting results that save you money!

Schedule a free concrete repair estimate to learn more. We proudly serve Longmont and the surrounding areas.

Our concrete repair solutions:

  • PolyLevel®® concrete leveling
  • NexusPro™ cracked concrete repair
  • SealantPro™ concrete sealing
  • Commercial concrete repairs
  • Driveway repairs
  • Pool deck leveling
  • Sidewalk repairs
  • Step repairs

The Thrasher Difference.

No matter the job - we aren't going to feel good about the hard work we've done until you're happy. So we'll do it right or make it right. That's the Thrasher promise.

For the last 45 years in the basement and foundation repair industry, we've focused on the value of doing whatever it takes to get the job done and "wow" our customers every step of the way.

Explore The Thrasher Difference

Before and After Pictures from Longmont

Recent job requests in Longmont, CO

Neighborhood: Lincoln Street, Longmont, 80501

Low spot in the floor in the basement - causing cracks in drywall

Neighborhood: Bross St, Longmont, 80501

External brick walls have multiple cracks at each corner area, door jam issues, interior wall cracking, floor issues, interior nail popping, exterior concrete cracking/shifting

Neighborhood: Longmont, 80501

Neighborhood: Harvard St, Longmont, 80503

There is a portion of my kitchen area that appears to be sinking

Neighborhood: Longmont, 80501

I just purchased a 100+ year old home and have some pretty significant cracks in the drywall/plaster on the main level.

Neighborhood: Lincoln Street, Longmont, 80501

Seal cracks in crawl space, fix metals, and seal off crawl space

Neighborhood: Bluebird Dr, Longmont, 80504

The sidewalk in front of my driveway has been settling and slopes down from the gutter. This ends up creating ponding of water in the winter and creates an ice rink. I am hoping you can raise the sidewalk and lower part of the driveway to a slope that drains again.

Neighborhood: Water Cress Ct, Longmont, 80504

Egress window detaching from foundation. Sinking around window. Water seeping into basement

Neighborhood: Longmont, 80501

Service: Crawl space problems

Neighborhood: Longmont, 80504

Our driveway has settled, the walls have settled some too and cracking the brick siding. Maybe small leaks in the basement. Think the foundation is still ok. Looks like concrete needs lifted and maybe cracks sealed...I need a pro to come look see and help me with a plan to fix what's going on. Thank you, Chad

Neighborhood: Longmont, 80503

I am looking to upgrade my sump pump system and find out what else I can be doing to prevent mold and mildew in basement. My sump runs 24/7 during the flood irrigation months in the summer and I need to be sure it

Neighborhood: Lincoln St, Longmont, 80501

In one corner of the basement water is seeping through from a break in the bricks outside the home. Water is also entering the sun room near the same spot.

Neighborhood: Sunset Street, Longmont, 80501

Front porch issue

Neighborhood: Longmont, 80504

Service: Foundation cracks or sinking

Neighborhood: Penhurst Circle, Longmont, 80504

Sidewalk on the side of my house has sunk in a couple of slabs. It is poured up against the house foundation. A small crack along the wall allowed some water to come into my crawlspace. I'd like to see if your system is more cost effective and a different alternative to new concrete (the slabs dropped at the stress point lines and are still in good shape).

Neighborhood: Roadrunner Ave, Longmont, 80504

Crack forming in driveway and steps. Joshua Camacho was working on my neighbors driveway and gave me a card.

Neighborhood: Snowmass Place, Longmont, 80504

Driveway cracks and movement

Neighborhood: Longmont, 80504

Neighborhood: Spruce Ave, Longmont, 80501

Probably need piers/piles and around full perimeter of house and garage.

Neighborhood: Elmore Rd, Longmont, 80504

Installation of sump pumps and some concrete lifting for patio and sidewalk.
Job Stories From Longmont, CO
Water Pooling on Concrete - Longmont, CO

These homeowners recently purchased a home and were having concerns with the driveway sinking towards the house. They were worried about rain and snowmelt pooling near the foundation, which could cause future foundation problems. They wanted a company that knew how to fix their problem, used quality materials, cleaned up after themselves, and offered great warranties - so they called Thrasher! One of our System Design Specialists, Rob Griffin, came out to meet with them. After the inspection, Rob found that due to poor soil compaction and water over time, the concrete in and around the garage has sunk towards the home. Rob proposed we use our PolyLevel to lift and level the concrete, NexusPro as a caulking to seal in-between the slabs and cracks, and SealantPro to extend the lifetime of the concrete. While out on the job, the crew noticed a dysfunctional downspout, which was a key issue the concrete failed the first time. Before the crew left, they fixed this downspout to ensure the homeowners were as taken care of as possible! The homeowners were so happy with the work, and could tell that Thrasher did care about the work we were doing for them. There is no doubt that they are done spending their time worrying about water damaging their concrete and foundation! 

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