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How to Fix a Sinking Concrete Floor

Joseph Coupal - Friday, June 30, 2017

We are in the middle of a miniseries discussing concrete floor cracks. Our last episode discussed how to fix cracks in floating floors. But what if a homeowner discovers a crack in a concrete floor and the concrete has started to sink? When they don’t have the money to replace the entire floor, here are the other options.

The first is to break that area of the floor, dig down, compact the floor; perhaps it happened because they didn’t have proper drainage; fix that, add gravel, compact the gravel, compact the ground and then pour new concrete.

You can also pin with metal into the good concrete and pour concrete there.

There is also a more cost effective way to do this. It's called “mud-jacking.” Where the floor is sunk, you drill a hole or a series of holes, create a concrete slurry which is pumped into the holes and you can actually raise the concrete. But if the soil is going to sink again, you haven’t solved much. So you have to make sure that soil is really compacted.

Sometimes you run into a situation where the soil underneath the floor is going to continue to sink. In this case you may want to use a technique called “foam-jacking.” This is very similar to “mud-jacking” except polymer foam is used. A series of holes are drilled and the foam liquid is pumped in. The foam penetrates the soil making it denser and more compact, and raises the concrete.

For more information on concrete floor crack repairs or basement waterproofing, contact A1 Foundation Crack Repair.

Floor Cracks on Floating Floors - Why and How to Fix

Joseph Coupal - Monday, June 26, 2017

One type of basement floor cracks you may find is in floating floors. What is a floating floor? Well, the foundation and walls are poured first; then gravel is brought in and compacted. The soil under the gravel is compacted as well. Then plastic is put down. Once this is all done, the concrete floor is poured to the basement walls.

The good news is that most residential construction is done this way, which means most cracks are not structural. Most basement floor cracks are caused by poor technique. The ground is not compacted, the gravel is not compacted, and possibly plastic down was not put down.

These cracks can be fixed by putting a material within the crack; it is a two-part material that welds it together. Most residential construction concrete floors are separate structures than the walls so that they can move and adjust during temperature changes.

For more information on basement crack repair or waterproofing, contact A1 Foundation Crack Repair.

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