There’s a damp spot on the basement wall. Or a musty smell that won’t go away. Maybe a little water creeps in every time it rains hard.
First thought? “I can probably fix this myself.”
Sometimes you can. A lot of DIY basement waterproofing really does work, especially when the problem is small and starts outside. But some popular DIY fixes just hide the water for a while. Then it comes back, often worse.
So, let us now look into “Waterproofing Your Own Basement: 6 DIY Fixes That Work and 4 That Don’t”!
Can You Really Do Basement Waterproofing Yourself?
Yes, for some problems.
DIY works best when:
- The wall is mostly dry, with light dampness
- Water shows up only after heavy rain
- The cracks are small and not growing
- The problem starts outside, like gutters or grading
DIY usually doesn’t work when:
- Water comes in after every rain
- There’s standing water on the floor
- Cracks are getting wider
- The wall is leaning or bowing
Here’s the key thing. Water almost always comes from outside. Most of the fixes that work deal with the water before it gets to the wall. Most of the ones that fail try to hold it back from the inside.
Not sure where yours is coming from? Start with our guide on where water gets into your basement.
6 DIY Basement Waterproofing Fixes That Work
These are the ones worth your weekend.
1. Clean Your Gutters and Extend the Downspouts
This is the cheapest fix, and one of the most useful.
Clogged gutters overflow. Short downspouts dump roof water right next to the foundation. That water soaks into the soil and pushes against your basement wall.
Clean the gutters. Then add downspout extensions so the water lands well away from the house. Simple. Often it fixes more than people expect.
2. Fix the Grading Around Your Foundation
The ground near your house should slope away from it. Over time, soil settles, and some homes end up with ground that slopes toward the wall. Every rain then runs straight to the basement.
Adding soil and sloping it away from the foundation is a doable DIY job for a lot of homeowners. If you’re not sure whether grading is your issue, read this to decide whether you should fix grading or waterproof first.
3. Seal Small, Dry Cracks
Hairline cracks that stay the same size and stay dry can be sealed yourself. Crack sealants from the hardware store work fine on these.
But not every crack is harmless. Before you seal anything, check which cracks are serious. For more on fixing them, see our crack repair options.
4. Use a Masonry Sealer on Dry Walls
Wondering how to seal basement walls? On a wall that’s dry most of the year, a masonry sealer can help with light dampness. It’s a common way of waterproofing basement walls from inside.
Interior sealant usually runs about $3–7 per square foot.
The catch is that it only works on dry walls. If water is pushing through from outside, the sealer can bubble, peel, or let water in anyway. More on that below.
5. Run a Dehumidifier
Sometimes the “water” isn’t a leak at all. It’s humid. Warm, damp air hits a cool basement wall and turns into moisture, a lot like a cold glass on a summer day.
A dehumidifier can make a big difference here. Keep the basement air dry, and a lot of that dampness and musty smell goes away.
6. Cover Window Wells and Seal Gaps
Basement window wells can fill up with rain and leaves. Then water seeps in around the window.
A clear window well cover keeps rain out. Clean out any debris. While you’re at it, seal small gaps around pipes and wires that come through the wall.
4 DIY Basement Waterproofing Fixes That Don’t Work
These are the ones we see fail again and again.
1. Painting Over a Wall That’s Already Leaking
Waterproof paint looks like an easy answer. Paint it on, problem solved.
Not if water is pushing through from outside. The paint is on the wrong side. Water pushes it off the wall, not into it. You end up with bubbles, peeling paint, and white crust coming through.
This is the biggest problem with waterproofing basement walls from inside. A coating can keep a drywall dry. It can’t make a wet wall dry.
2. Plugging Moving Cracks With Hydraulic Cement
Hydraulic cement sets fast and stops a small trickle. That part works. But it’s rigid, and if the crack keeps moving, the patch cracks or pops loose. We explain why in our post on the downsides of hydraulic cement for basement leaks.
3. Digging Out the Outside of the Foundation Yourself
Exterior basement waterproofing means digging down along the foundation, cleaning the wall, and adding a membrane and drainage. It works well. It’s also heavy, risky work.
Trenches can collapse. You can hit utility lines. And if the membrane or drainage isn’t done right, all that digging is wasted. This one is best left to a crew. You can compare it with other options in our guide to basement waterproofing methods.
4. Installing an Interior Drain and Sump Pump Yourself
An interior drain system with a sump pump is one of the most reliable ways to handle basement water. But it means breaking up the floor, digging a trench, setting the drain pipe, and wiring the pump.
A sump pump installation alone typically costs around $1,200–1,800. Get it wrong, and you’ve spent the money and still have water.
Is DIY Basement Waterproofing From Inside Enough?
Sometimes. If your basement just has light dampness, a dehumidifier and a sealer on dry walls can be enough.
But if water is getting in, inside-only fixes usually don’t hold. The water is still building up outside, and it’ll find a way in.
Not sure what your basement actually needs?
When to Stop DIY and Call a Pro
Some signs mean the problem is bigger than a weekend fix:
- Water comes in after every rain
- Puddles or standing water on the floor
- Cracks that are getting wider
- A wall that’s leaning or bowing
- White crust that keeps coming back
- Coatings that keep peeling
A bowing wall is a structural problem, not a sealing one. Read about the signs of a bowing basement wall. And if the cracks are in the floor, see our post on basement floor cracks.
Final Thoughts
DIY basement waterproofing can work. Clean gutters, better grading, sealing small dry cracks, and keeping the air dry can solve a lot of problems.
But painting over a leak, patching moving cracks, or tackling big drainage jobs on your own usually ends with more water and more money spent.
Start outside. Keep it simple. And if the water keeps coming back, it’s time for a closer look.
At Tri-State Waterproofing, we start with an honest inspection. We find where the water is really coming from and tell you what your basement actually needs. Sometimes that’s a simple fix you can do yourself. Learn more about our basement waterproofing services, or call us at (770) 285-1080.
Frequently Asked Questions
Can I waterproof my basement myself?
For small problems, yes. Gutters, downspouts, grading, sealing small dry cracks, and a dehumidifier are all good DIY jobs. For steady leaks, moving cracks, or bowing walls, call a pro.
What is the best DIY basement waterproofing from inside?
On drywall, a masonry sealer plus a dehumidifier works well. If water is pushing through the wall, inside coatings alone usually won’t hold.
How do you waterproof basement walls?
On dry walls, clean them and apply a masonry sealer. If the wall is wet or leaking, deal with the water first, usually by fixing gutters, grading, or drainage.
Does waterproof paint work on basement walls?
On dry walls with light dampness, it can help. On walls with water pushing from outside, it tends to bubble and peel.
Is DIY basement waterproofing worth it?
For outside fixes like gutters and grading, absolutely. They’re cheap and often solve the problem. For drainage systems and exterior digging, a pro usually saves you money in the long run.
How do I know if my basement problem is too big for DIY?
Water after every rain, standing water, growing cracks, or a bowing wall are all signs it’s time to call a pro.
