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Waterproofing & Crawl Space Repair Services in Knoxville, TN

Crawl space services, and only crawl space services

We do not do basements, foundations, concrete or roofs. Everything below is work that happens under a house, which is the only place we work, and the reason our crews are good at it.

01

Waterproofing

Stop water getting in, and move the water that is already there back out.

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How the system works

Crawl space drainage, in cross-section

Not to scale · every install is sized to the space
Crawl space drainage, in cross-sectionCutaway through a crawl space under a house: floor joists and a girder overhead, masonry piers on pads, a bare dirt floor, and a block foundation wall at each side with soil outside. Rain leaves a downspout on the left and soaks down through the ground, arrows push it sideways against the wall, and it collects on the dirt floor. Inside, a perforated drain pipe sits in a gravel trench along the base of the wall and runs right to a covered sump basin, whose pump sends the water up a riser and out away from the house. On the right, a dashed vapor barrier runs across the floor from the sump and turns up the inside of the wall. Five numbered callouts. One, the problem: rain and runoff saturating the ground around the house. Two, the problem: water pushing through the wall and up through the dirt floor. Three, the system: a perforated drain in a gravel trench around the inside perimeter. Four, the system: a sump basin and pump at the low point. Five, the system: the discharge line running the water well away from the house.12345GradeFloor aboveVapor barrier
  1. Callout 1. The problem: Rain and runoff soak the ground around the house. Downspouts and the fall of the lot decide how much of it arrives.
  2. Callout 2. The problem: It pushes through the block wall and up through the dirt floor, and the crawl space is the low point it collects in.
  3. Callout 3. The system: A perforated pipe in a gravel trench around the inside perimeter catches it below the level of the ground you crawl on.
  4. Callout 4. The system: It runs to a sump basin at the low point, where a pump lifts it out. Each pump is sized to the water it actually has to move.
  5. Callout 5. The system: The discharge line is routed far enough from the house that the same water does not simply come back.

02

Crawl Space Encapsulation

Seal the ground off, then keep the air under there dry for good.

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How the system works

A sealed, conditioned crawl space

Not to scale · sized to the space
A sealed, conditioned crawl spaceCutaway through a crawl space under a floor, with a foundation wall at each side and bare ground below. Arrows show moisture rising out of the soil. A continuous liner covers the ground and turns up both walls, the foundation vent at the left is sealed shut, hatching marks insulation on the walls, and a dehumidifier and a covered sump sit in the space. A discharge line leaves the sump and runs out through the wall. Five numbered callouts. One, the problem: bare earth giving off moisture into the air under the floor. Two, the system: a reinforced liner across the ground and up the walls. Three, the system: the sealed vent and the insulated wall behind it. Four, the system: a dedicated dehumidifier holding the space at fifty to fifty-five percent. Five, the system: drainage and a covered sump carrying collected water out.12345GradeFloor aboveInsulated wall
  1. Callout 1. The problem: Bare earth gives off water continuously (gallons a day under an average house), and that air ends up on your first floor.
  2. Callout 2. The system: A reinforced liner goes down over the ground and up the walls, sealed at the seams, the piers and the perimeter. The edges are what fail on a cheap job.
  3. Callout 3. The system: Vents and access get sealed and the perimeter walls insulated, because a vented crawl space just pulls humid summer air in against cool surfaces.
  4. Callout 4. The system: A dedicated dehumidifier holds the space around fifty to fifty-five percent, which is the range where mold will not get started.
  5. Callout 5. The system: Where the ground is wet, drainage and a sump go in first. Water that is actively running in will just float on top of a liner.

03

Crawl Space Repair

Steel supports on proper footings, sealed foundation vents and an access door that closes: the parts of a crawl space that fail first.

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How the repair works

Taking the load off a settled pier

Not to scale · every support sized to the load
Taking the load off a settled pierCutaway along the main girder under a crawl space, with the floor deck and its joists above, bare ground below, and a foundation wall at each side. A dashed line marks the floor's original level; the framing sags away from it toward the right. Five numbered callouts. One, the problem: ground moisture rising year after year out of the bare earth. Two, the damage: a cracked masonry pier that has settled into soft ground on stacked shims. Three, the damage: the girder above it dropped with the pier, measurably below the level line. Four, the system: two adjustable steel support jacks on poured footings bearing on undisturbed ground, raised gradually to take the load off the failing pier. Five, the system: the ground below sealed with a liner and drained so the new supports stay on firm, dry ground.12345Level datumGradeUndisturbed bearing grade
  1. Callout 1. The problem: Years of ground moisture under the crawl space. Damp wood loses strength, and damp ground gives way under whatever is standing on it.
  2. Callout 2. The damage: The pier settles into ground that never dries, and someone stacks shims under it to buy a few more years.
  3. Callout 3. The damage: The girder drops with it, and the load the house was built to carry there is no longer where it should be.
  4. Callout 4. The system: Adjustable steel supports on poured footings take the load, brought up gradually to measured elevations. Forcing a floor cracks everything above it.
  5. Callout 5. The system: The ground gets sealed and drained at the same time, so the new supports sit on firm, dry ground and stay there.

Being straight with you

What we do not do

Being a specialist means turning work down. If your problem is on this list, we are not the right company, and we will say so now, before anyone drives out.

  • Finished basements
  • Foundation underpinning
  • Concrete lifting or leveling
  • Radon testing or mitigation
  • Roofing
  • Fire, smoke or storm restoration
  • Insurance claim handling
  • Mold treatment or remediation
  • Sagging floor, joist or wood rot repair

What it costs

Typical price ranges

Typical installed prices around Knoxville, from local and national cost guides (October 2026). Your written price comes after we have been under the house and seen the job in person.

Typical price ranges for crawl space work
ServiceTypical range
Full crawl space encapsulation$5,000–$12,000
Vapor barrier only$1,500–$4,500
Crawl space dehumidifier$1,000–$2,500
Crawl space insulation$1,000–$3,500
Interior French drain$25–$35 / linear ft
Exterior French drain$3,000–$6,500
Sump pump installation$800–$2,000
Sump pump repair$300–$600
Underground downspout line$200–$2,000 per downspout
Regrading around the house$1,000–$3,300
Crawl space support jacks$1,000–$1,600 each
Sealing foundation vents$150–$450
What moves each price, with a calculator, in the cost guide

Questions

Picking the right service

I'm not sure if I need waterproofing, encapsulation or repair. How do you decide which one fits my house?

We decide after we've been under the house. Running water coming in calls for waterproofing, damp air with no standing water points to encapsulation, and sagging floors or failed piers point to repair. Many homes need a mix, and the estimate lays out each piece with its own price.

My basement leaks too. Is that something you'll take on along with the crawl space?

We work only on crawl spaces, so basements, foundation walls and concrete are outside what we do. The same goes for mold remediation, radon, roofing and replacing rotted joists. If we see one of those at your estimate, we'll tell you so you can call the right trade.

Our crawl space needs a drain and an encapsulation. Can you do both in one job?

Yes, and doing them together usually makes sense, since the water has to be handled before the liner goes down. The estimate shows each part on its own line so you can see what everything costs. You can also choose to start with one and add the other later.

I want to get the work done, but I can't pay for it all at once. Is there a way to spread it out?

Financing is available, and we can talk through it at the estimate. You can also split a bigger job into stages, starting with whatever is doing the most harm. First-time customers get 10% off their first service.

If something you install stops working, who do I call and what's covered?

You call us at 865-503-5483. Our work carries a workmanship warranty, and its terms are written on your estimate before you agree to anything. Read it, ask questions, and keep a copy with your house papers.

We're getting the house ready to sell. Which crawl space fixes matter most to a buyer's inspector?

Inspectors tend to flag standing water, failed or shimmed piers, torn vapor barrier and fallen insulation. We can look at the inspection report with you and tell you which items we handle. You'll get a written price for each so you can decide what to fix before listing.

Not sure which one you need?

That is what the free estimate is for. We go under the house, take readings, and tell you what is actually causing it, including when the answer is cheaper than you expected.

Call 865-503-5483Request an estimate

Monday–Friday, 9am–5pm · Free on-site estimates, no obligation