Repairing a cinder block foundation is difficult, dirty and exhausting work. Although the steps are simple, the work is not. If this does not sound like your type of thing, call a contractor and save yourself the trouble. But if you are up to the challenge, follow the steps to repair the two most common problems -- a basement leak or a large crack.
Things You'll Need
- Plaster premix
- Foundation tar
- Drain tube
- Premixed cement
Dig down to the building's foundation. Dig all the way to the bottom, where the foundation meets the earth.
Mix cement premix until it is sticky and runny.
Apply the mix to the outside portion of the cinder block wall, using broad strokes and a wide flat trowel. Apply it 1 inch thick, all the way from the base of the foundation to the place where the foundation meets the ground's surface.
Allow the plaster mix to set for two to three days.
Coat the dried plaster with foundation tar. Let it sit for another day or two.
Install a drain tube along the bottom of the foundation to catch water before it enters the basement.
Create a crumbly, dry mixture of premixed cement.
Pack the mixture into the crack in the foundation. Make sure you pack it in as tight as you can get it.
Watch the crack for the next few months to see if it reappears. If it does, call a contractor immediately.
Tips & Warnings
- If your foundation has a small crack in it, don't be alarmed. Just dab a little cement premix over it and forget about it.
- If the crack in the foundation is more than an inch wide, call a contractor immediately. This could indicate that a corner of the foundation is settling.
- "Successful Home Repair: When Not to Call the Contractor"; Gary Paulson; 1978
How to Fix Cracks in a Concrete Block Foundation
Many older homes have concrete block foundations, and time, weather and other elements may cause damage. An expert inspector can tell whether...
How to Repair a Deteriorating Concrete Block Foundation
Concrete block foundations provide the stability and strength of the home. Over time, the block foundation can begin to deteriorate, possibly causing...
Do-It-Yourself Block Foundation Wall Repair
Like bricks in a wall, concrete blocks in a foundation are held together by mortar. Over time, mortar cracks and deteriorates, allowing...
How to Repair a Foundation Bowing
One of the more common problems occurring in concrete block foundation walls is that of bowing. An inward curvature develops, which places...
How to Repair Cinder Block Mortar Joints
Cinder blocks walls are frequently encountered in out-buildings such as garages and storage sheds, as well as in basements. Although the concrete...
How to Repair Basement Concrete Block Walls
If you are looking at cracks in the exterior walls of your basement, you are looking at cracks in your foundation. Fortunately,...
How to Use Epoxy to Repair a Cinder Block Wall
Cinder blocks, or blocks typically constructed of concrete and coal cinders, are a construction material used in the formation of foundations and...