Most mortar joints will develop hairline cracking over their lifespans from the expansion and contraction of soils. The beams are attached to the basement floor and joists to stop the wall from bowing inward and withstand the bending load on the wall.Ĭinder block foundation walls have mortar joints on all sides of the blocks, creating a weak point through which moisture can seep into the basement. It requires the installation of steel I-beams on the inside of the wall. The second method is more suitable for unfinished basements. With the soil dug out, we can repair any holes and cracks and replace the missing mortar. It’s a task that requires more work on the part of your contractor, but if performed well, the only noticeable result is a straight, flat wall. The first solution is digging the dirt out from around the foundation, twisting augers into the surrounding soil, and using tie rods to pull the wall back into place. If you catch the signs of a bowing basement, there are two repair methods. How To Repair A Bowing Basement Cinder Block Wall The results are cracking in the mortar joints and walls that bow inward, but you might notice issues like water damage before anything structural. They begin to fail when a heavy load pushes horizontally against the foundation, and the most common culprit for this is waterlogged soil. A center web connects the flat faces on either side of the block, with two additional webs at each end with ears creating a narrow void between two touching blocks.Ĭoncrete block foundations are strong when used to carry vertical loads. These blocks have spaces inside, called the core, and the concrete used to make them is called the web. Most cinder block walls are made with blocks 8 inches high, 8 inches thick, and 16 inches long. How would we approach repairing this kind of basement wall? Because they are rarely solid in the middle, the cinder block used for foundations can develop unique problems. ![]() Lime will leach out of the cement for several weeks making paint adhesion a problem.Concrete block foundations have their benefits, though these days, you’ll find them supporting older homes. Make sure the edges of the holes are packed with the patching cement to increase the bond to the old block.ĭo not be in a hurry to paint the repaired area once the repair is complete. Apply the patching cement into and around the wire mesh working from the center to the edges. ![]() Use wire mesh, like 1/2″ hardware cloth or chicken wire, and stuff it in the holes in the cinder blocks. Work in small areas so the bonder does not become too dry before coating with patching material. Dampen the surface and apply the bonder with a roller or brush and wait until it becomes tacky (not dry) before applying the patching cement. Concrete bonder is a primer to give improved adhesion between masonry surfaces. Your first job is to remove all the loose paint on the wall that you can.Īpply CONCRETE BONDER to the bare cinder blocks and around the holes you are about to patch. You need patching cement to repair these holes. ![]() A water-based paint would have permitted the moisture to evaporate away. It would seem the oil-based paint that was previously applied to the wall retained moisture causing the cinder blocks to break down. The usual cause is water has been seeping behind the paint on your block wall for some time. Cinder block repair uses a concrete bonder for adhesion, patching cement and some material to plug the holes for the cement block repair.
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