Recurring Foundation Problem

[Sonu Sharma]

We have a 1957 built house which had foundation problems when we bought the house in 2016. The house had a crack all the way on one side of the house - stretching from living room, dining, kitchen and bedroom. Our contractor said that he would pour concrete to fill up the cracks, which he did. He then hired a foundation company that put in 9 exterior piers to level the house and it came with a lifetime transferable warranty. About 6 months ago, our tenants complained about gaps in the floor and we called the foundation comoany to check it out. They came in and determined that the piers had to be raised and when they began raising, a crack in the concrete in the middle of the house gave in and the foundation company said that they cannot raise the piers anymore.

Upon further investigation, we came to know that the previous contractor never mentioned that the concrete slab didnt have a post tension cable or rebar. The crack was just filled with concrete and left. Another company stopped by today suggested that they could fix this problem by mudjacking the floor with polyurethane - first time we heard of this. The sink in some places is about 1-1.5 inches.

Can anyone please share their experiences with polyurthane mudjacking ? Are there any long term problems with this ? Cost wise is this better than using concrete or worth the money ? Appreciate the help.

[Mike Reynolds]

Originally posted by @Sonu Sharma:

We have a 1957 built house which had foundation problems when we bought the house in 2016. The house had a crack all the way on one side of the house - stretching from living room, dining, kitchen and bedroom. Our contractor said that he would pour concrete to fill up the cracks, which he did. He then hired a foundation company that put in 9 exterior piers to level the house and it came with a lifetime transferable warranty. About 6 months ago, our tenants complained about gaps in the floor and we called the foundation comoany to check it out. They came in and determined that the piers had to be raised and when they began raising, a crack in the concrete in the middle of the house gave in and the foundation company said that they cannot raise the piers anymore.

Upon further investigation, we came to know that the previous contractor never mentioned that the concrete slab didnt have a post tension cable or rebar. The crack was just filled with concrete and left. Another company stopped by today suggested that they could fix this problem by mudjacking the floor with polyurethane - first time we heard of this. The sink in some places is about 1-1.5 inches.

Can anyone please share their experiences with polyurthane mudjacking ? Are there any long term problems with this ? Cost wise is this better than using concrete or worth the money ? Appreciate the help.

Not trying to split hairs here but clarity is necessary. First its helpful to get the terms correct. Mudjacking is one thing and Poly Injection is another. 

Mudjacking is cheaper and not always more permanent. It can be though. 

Poly Injection is more permanent and more costly. 

Mudjacking weighs a lot and can cause the mudjack to settle just as much as the concrete. Thats why it is not as permanent. Poly weighs less and doesnt cause the settling so it last longer.