How do you repair damaged cinder blocks?
Sarah Garza
Updated on March 30, 2026
Fill in the cracks or holes with concrete. Apply concrete to any gaps in the blocks or mortar using a shovel. Fill the holes and cracks as deeply as you can, then scrape the top over with a trowel so the concrete can patch the wall together evenly.
How do you repair water damaged cinder block walls?
You can apply waterproofing and drainage solutions both during new construction or renovations. Common waterproofing methods include the application of parge coats, which are thin cement-based products, rubber membranes, waterproofing paint or asphalt-based waterproofing compounds.
How much does it cost to repair a cinder block wall?
Typical Block Wall Repair Cost
| Low Cost | $200 |
|---|---|
| Typical Cost | $600 |
| High Cost | $1,500 |
How do you repair large cracks in cinder block walls?
Fixing Cracks In Concrete Walls
- Before Your Begin.
- Use an Epoxy-Injection System for Basement Wall Crack Repair.
- Step 1: Scrub it Clean.
- Step 2: Use a Nail to Align Injection Points.
- Step 3: Mix the Two-Part Epoxy Crack Sealer.
- Step 4: Spread the Sealer onto Base.
- Step 5: Mix and Apply a Larger Batch of Epoxy Sealer.
How long does cinder block last?
It may take 5-10 years, but once the exterior waterproofing coatings and damp-proofing membranes deteriorate, the cinder blocks will be on their own to fight against negative side water pressure.
Should you fill cinder blocks with concrete?
Whenever you are working with cinder block, you can strengthen them significantly by filling them with concrete. This is something that is not difficult to do and will strengthen your cinder blocks quite a bit. You may also find that if you have cinder blocks that are cracked, concrete can help.
Can you repair cinder block wall?
You can fix cracks in a cinder block wall using a type of glue called epoxy. Repairing a cinder block wall with epoxy may take some time and preparation, but a few basic tools, including a hammer and chisel, should help you complete the task.
Can you repoint cinder block wall?
Try to keep it steady as you level it with its neighbors by applying mortar on the sides to make the joints even. By taking the time to repoint, you can have a secure cinder block wall for decades and save yourself a heap of trouble over the long term.
What can I use to repair a cinder block wall?
Now you could just wire-brush that and get it down to the block, because you can’t put any kind of repair material over paint that’s not adhered to the block wall because it just won’t stick. HOWARD: Right. TOM: And then secondly, you’re going to use an epoxy patching compound. You can’t use more mortar or concrete.
Why are there cracks in my cinder block basement?
If the water in the blocks cannot escape, the walls will seep because the cinder-blocks are porous and allow moisture to wick through them. Cinderblock foundation cracks in basement walls are generally observed in the mortar joints binding the blocks together; however, sometimes there are cracks in the blocks themselves.
Why is the face of my cinder block wall crumbling?
HOWARD: And a couple of the cinder blocks, the face of it just started crumbling. I found it on the dryer down there last week. And it’s not all the way through; it’s just part of it. And the people that had it before me painted the walls, so there’s some kind of paint on there. But it’s not all the cinder blocks. It’s just a scattered few.
What causes water to seep through a cinder block wall?
Once ground water penetrates a cinderblock foundation wall, the hollow cavities in the blocks will fill up with water. If the water in the blocks cannot escape, the walls will seep because the cinder-blocks are porous and allow moisture to wick through them.
