Can You DIY Foundation Repair?
(Honest Answer)
Some things you can handle yourself. Some things you absolutely cannot. Here is where the line is.
We Are a Foundation Repair Company. You Would Expect Us to Say "Call a Pro for Everything."
We won't. That would be dishonest, and dishonesty is a bad way to earn your trust.
The reality is that some foundation-related maintenance is perfectly within a homeowner's ability. Cleaning gutters, regrading soil, extending downspouts, filling a hairline crack with concrete caulk — these are not complicated tasks, and paying a contractor to do them for you is often unnecessary.
But structural foundation work is a different category entirely. It involves engineering calculations, specialized equipment, significant safety hazards, and building permits. The line between "maintenance you can handle" and "repair that requires a professional" is not always obvious from the surface — and crossing it with a DIY attempt can turn a $3,000 problem into a $15,000 one.
This page is our honest attempt to draw that line clearly. We will tell you what you can do yourself, what you should never attempt, and how to figure out which category your specific situation falls into.
The Foundation Problem Severity Chart
Use this as a quick reference. If you are unsure which zone your problem falls into, get a free inspection — that is exactly what they are for.
- Hairline cracks (less than 1/16")
- Regrading soil away from foundation
- Extending downspouts
- Cleaning gutters and window wells
- Waterproofing paint (temporary)
- Monitoring cracks with pencil marks
- Recurring water after rain
- Multiple cracks in same wall
- Sticky doors or windows
- Cracks 1/16" to 1/4" wide
- Musty smell in basement/crawlspace
- Horizontal cracks
- Bowing or leaning walls
- Sinking or uneven floors
- Stair-step cracks wider than 1/4"
- Active structural movement
What You CAN Do Yourself
These are maintenance tasks that protect your foundation and manage minor cosmetic issues. None of them involve structural work, and all of them are within the skill level of a typical homeowner with basic tools.
Cosmetic Crack Filling
Hairline cracks thinner than 1/16 inch (about the thickness of a credit card) are almost always caused by normal concrete curing and shrinkage. They are cosmetic, not structural. You can fill them with concrete caulk ($5-$10 per tube) or hydraulic cement ($8-$15 per tub). Clean the crack with a wire brush first, apply the filler, smooth it, and let it cure. This is a sealing job, not a repair — you are keeping water and insects out, not stabilizing the wall.
Soil Grading and Drainage
The ground around your foundation should slope away from the house at a rate of about 6 inches over the first 10 feet. If soil has settled or eroded and water pools against your foundation wall, you can regrade it yourself with topsoil and a rake. This is one of the single most effective things you can do to protect your foundation — and it costs under $50 in materials. While you are at it, extend any downspouts that dump water within 4 feet of the house. Downspout extensions cost $8-$15 each and snap right on.
Gutter Maintenance and Window Well Covers
Clogged gutters dump hundreds of gallons of water directly against your foundation during every rainstorm. Cleaning them twice a year — spring and fall — is free and takes an afternoon. Installing window well covers ($15-$30 each) keeps debris and rain out of basement window wells. These are straightforward, low-cost maintenance tasks that significantly reduce water pressure against your foundation walls.
Crack Monitoring
If you have a crack you are keeping an eye on, mark both ends with a pencil and write the date. You can also tape a piece of paper across the crack — if the paper tears, the crack is moving. Check monthly. If it is not growing after 6-12 months, it is likely stable. If it grows, changes direction, or new cracks appear nearby, move to the yellow zone: get an inspection. A roll of masking tape and a pencil cost you nothing.
What Requires a Professional
These are not tasks you can learn from a YouTube video. They require engineering analysis, specialized equipment, building permits, and experience with the specific soil conditions in your area. In Kansas City, that means understanding how Wymore-Ladoga clay behaves across seasons. In Des Moines, it means accounting for glacial till and high water table conditions.
Structural Crack Repair
Horizontal cracks, stair-step cracks in block walls, and any crack wider than 1/4 inch indicate active soil pressure or foundation movement. These are not cosmetic — they are structural, and the crack you see on the surface is a symptom of a larger force acting on the wall. Proper repair requires identifying the cause (lateral soil pressure, settlement, hydrostatic pressure) and engineering the correct solution. An incorrectly repaired structural crack will fail again — usually worse than before. This is where professional foundation repair begins.
Bowing or Leaning Walls
A wall that has visibly moved inward is under serious lateral pressure from the soil outside. This requires stabilization — either carbon fiber straps, steel I-beams, or wall anchors — depending on the degree of movement and the wall construction. The selection, spacing, and installation of these systems all depend on engineering calculations specific to your wall. Improperly installed carbon fiber straps or wall anchors that miss load-bearing soil can create a false sense of security while the wall continues to move.
Pier Installation and Structural Lifting
When a foundation has settled or sunk, piers (steel shafts driven to load-bearing bedrock or stable soil) are used to stabilize and sometimes lift the structure. This involves excavation, hydraulic equipment, and precise load calculations. The number of piers, their placement, and the depth they need to reach are all engineered for your specific home and soil conditions. There is no DIY version of this.
Interior Drainage, Sump Pumps, and Crawlspace Encapsulation
Interior drain tile systems involve cutting trenches in your basement floor, installing perforated pipe in gravel beds, and routing water to a sump pit with a properly sized pump. Waterproofing systems need to be designed for your specific water volume, floor construction, and drainage path. Crawlspace encapsulation involves vapor barriers, dehumidification, insulation, and often spray foam — all of which need to work together as a system. Partial solutions create partial results and can trap moisture in new places.
The Danger Zone: DIY Repairs That Backfire
These are the repairs we see homeowners attempt most often — and the ones that cause the most expensive callbacks. In every case, the DIY attempt was cheaper up front and dramatically more expensive in the end.
Carbon Fiber Straps — Improperly Installed
Carbon fiber straps are incredibly strong when applied correctly — correct surface prep, correct resin, correct placement. Installed wrong (too few straps, poor adhesion, wrong wall prep), they peel off within months. The wall keeps moving. You now need straps plus full wall stabilization.
Filling Structural Cracks with Epoxy
Epoxy injection bonds concrete back together and can be a valid repair — when the cause of the crack has been addressed first. Injecting epoxy into an actively moving crack is like putting a bandage on a broken bone. The crack will re-open next to the repair, the epoxy will mask the severity of the problem, and any future warranty from a professional may be voided.
Waterproofing Paint Over Active Leaks
Waterproofing paint is designed for minor dampness. Applied over an active water intrusion, it traps moisture between the paint and the wall. That moisture has nowhere to go — it migrates into the concrete, accelerates deterioration, and eventually the paint blisters and peels. Meanwhile, the water continues coming in.
YouTube Mudjacking Attempts
We have seen homeowners rent equipment and attempt to lift settled concrete themselves. Without knowing the void pattern, soil bearing capacity, and correct injection pressure, the result is usually cracked slabs, uneven lifts, and a mess of hardened slurry in places it should not be. Professional polyjacking uses precision-injected polyurethane foam for a reason.
How to Know Which Category Your Problem Falls Into
When in doubt, measure. A simple crack width measurement tells you more than most guesswork:
Mark them, check monthly. Fill cosmetically if desired. These are almost certainly curing cracks.
These may be fine. They may not be. A professional inspection determines which — and ours are free.
Do not wait. Do not fill with epoxy. Do not monitor. These indicate structural failure in progress.
The general rule: if you are seeing one isolated cosmetic symptom, you are probably in the green zone. If you are seeing multiple symptoms — cracks plus sticky doors, water plus musty smell, uneven floors plus wall gaps — you are in the yellow or red zone regardless of how small any individual symptom seems. Multiple symptoms together almost always indicate a systemic foundation problem.
And if you are reading this page because you already suspect something is wrong — that instinct is usually correct. A free inspection costs you nothing except 45 minutes, and it replaces uncertainty with answers.
The Cost of Waiting: Foundation Damage Over Time
DIY vs. Professional: Common Questions
Hairline cracks (less than 1/16 inch) that are not growing can be filled with concrete caulk or hydraulic cement as a cosmetic fix. However, any crack wider than 1/16 inch, any horizontal crack, or any crack that is actively growing needs professional evaluation. Filling a structural crack with epoxy without addressing the underlying cause can actually make the problem worse — it masks the movement and can void future warranty coverage.
Direction and width are the two biggest indicators. Vertical hairline cracks (thinner than a credit card) are usually from normal concrete curing and are cosmetic. Horizontal cracks, stair-step cracks in block walls, diagonal cracks radiating from corners of windows or doors, or any crack wider than 1/4 inch are structural warning signs. If you can fit a quarter into the crack, call a professional immediately.
Waterproofing paint (like DryLok) can reduce minor dampness and efflorescence on basement walls, but it is not a waterproofing solution. It does not stop hydrostatic pressure, it does not address water sources, and it will eventually peel and fail if real water pressure is behind the wall. We have seen homeowners spend hundreds on waterproofing paint only to need a full interior drain system a year later. Use it for mild dampness — not for actual water intrusion.
In both Kansas City and Des Moines metro areas, any structural foundation repair requires a permit. This includes pier installation, wall stabilization (carbon fiber or steel beams), interior drainage systems, and any excavation work. Cosmetic crack filling, regrading soil, and extending downspouts typically do not require permits. Working without a required permit can result in fines, and unpermitted structural work can create serious problems when you sell your home.
At JLB, our foundation inspections are completely free. We will come to your home, evaluate the entire foundation, explain what we find in plain English, and give you a written estimate with no pressure and no obligation. The inspection typically takes 45 minutes to an hour. We recommend getting an inspection if you are seeing any of the yellow or red zone symptoms described above — even if you are not sure whether the problem is serious.
Not Sure If It's DIY Territory?
Our inspections are free, honest, and come with a written estimate. No pressure, no obligation — just answers from a team that does this every day.