[bote110]

A Concrete slab was made for a ac unit and I watch it how they made the wood forum, laid sand first and pact it down tight the gravel was next and got poured concrete and smooth out nice.
We got a heavy rain at our new built house , water was all around and with no grass it was like a river rushing to one end of the house , well the next day I notice that the slab was tilted and almost every thing underneath got wash out, it piss me off!
What should I do? can I jack it up a little and add bricks across it to level it out a little ? What it is the dirt is settling around the house after the construction with all the digging that was done for the foundation and under ground power lines and with the heavy rain it's packing the dirt down .

 

[Daniel Holzman]

It sounds like you are having a house built for you, and the slab was part of the construction. Once the slab has cured sufficiently, it should be a simple matter for the contractor to lift the slab up using a fork lift or similar piece of equipment, correct the washout using crushed stone, and reinstall the slab. This should not be your problem, unless you are the contractor. I would not do this until the drainage has been corrected, since it is likely to simply wash out again, but this is also the contractor's problem.

 

[Guywithskills]

Jack and fill

If the house is under construction, the contractor should take care of it and for 2 years after for home warrranty.

If you have to, then lever it up, just enough to get the job done to avoid kinking copper freon lines. you could throw dirt under... which will wash out. Rather than brick, put mixed mortar under best you can, tamp in with 2x2 stick or whatever. Mortar will be on dry side.

 

[rafaelrobertson]

A Concrete slab was made for a ac unit and I watch it how they made the wood forum, laid sand first and pact it down tight the gravel was next and got poured concrete and smooth out nice.
We got a heavy rain at our new built house , water was all around and with no grass it was like a river rushing to one end of the house , well the next day I notice that the slab was tilted and almost every thing underneath got wash out, it piss me off!
What should I do? can I jack it up a little and add bricks across it to level it out a little ? What it is the dirt is settling around the house after the construction with all the digging that was done for the foundation and under ground power lines and with the heavy rain it's packing the dirt down .


concrete staining boston

I'm just In the process of having a solid floor done at my house, we are currently filling the floors with hardcore. A concrete slab will be everywhere including my kitchen which will have a stone island. Just wondering what is the best thickness to go for? We are creating the space so I can allow for any amount of space however I don't want to overspend. But I want a thickness which will encounter no problems at all. I have been told by some people 100mm and by others 150mm. For the record I will have 100mm insulation under the concrete, and another 100mm underneath 75mm of screed (wet ufh) So that's 200mm insulation in total, 100 below concrete and 100 below screed

 

[HotRodx10]

rafaelrbertson, this thread is almost 10 years old, and your situation is totally different. You should start a new thread with a title relevant to your project and issues. You'll get more relevant responses, and nobody has to read through a bunch of posts that are irrelevant to your issues.

 

[Racinmason]

I'm just In the process of having a solid floor done at my house, we are currently filling the floors with hardcore. A concrete slab will be everywhere including my kitchen which will have a stone island. Just wondering what is the best thickness to go for? We are creating the space so I can allow for any amount of space however I don't want to overspend. But I want a thickness which will encounter no problems at all. I have been told by some people 100mm and by others 150mm. For the record I will have 100mm insulation under the concrete, and another 100mm underneath 75mm of screed (wet ufh) So that's 200mm insulation in total, 100 below concrete and 100 below screed

I'll answer....100mm is around 4". That is standard for the stone and the concrete thickness, even driveways are that thick, you should be fine. I did notice that you also have 4" of insulation, that is twice as thick as most people use, standard is 2" of insulation board.

 

[Matt1963]

I'll answer....100mm is around 4". That is standard for the stone and the concrete thickness, even driveways are that thick, you should be fine. I did notice that you also have 4" of insulation, that is twice as thick as most people use, standard is 2" of insulation board.

Not sure how you can understand what he's even asking!

 

[Racinmason]

Not sure how you can understand what he's even asking!

I have a good imagination, and decent math skills

 

[stuart44]

I'll answer....100mm is around 4". That is standard for the stone and the concrete thickness, even driveways are that thick, you should be fine. I did notice that you also have 4" of insulation, that is twice as thick as most people use, standard is 2" of insulation board.

100mm insulation boards are pretty standard for concrete floors in the UK, so I'm surprised it's only 50mm in the USA, which is usually colder.
However, not much heat is lost through the floor, so it's probably a waste of time.

 

[Racinmason]

100mm insulation boards are pretty standard for concrete floors in the UK, so I'm surprised it's only 50mm in the USA, which is usually colder.
However, not much heat is lost through the floor, so it's probably a waste of time.

Good to know Stuart.