03:22AM | 03/13/03
Member Since: 03/12/03
1 lifetime posts
I am building a house in Japan. The foundtion is being dug at the moment. Before the concrete is poured I would like to have a question answered about the order of the materials. It will be a crawl space foundation with the crawl spaces being covered by cement. The order is as follows.

1. 6 in. layer of gravel

2. 2 in. layer of concrete

3. 0.1mm vapor diffusion retarder

4. 6 in. layer of concrete

Do you see any problems with this.


Ralph Greene


05:24PM | 03/13/03
Member Since: 11/06/02
1280 lifetime posts
Not if you have money to burn.

Maybe concrete is cheap over there and there are local reasons to need the soils stabilixed that way. Mayb it has to do with earthquakes.

For a somple mud slab in a crawl space here, I would put down fourinches of stone, the membrane over the stone, and a two or three inch mud slab. If it is to be strcutureal floor, I would go to four inches and reinforce with wire mesh.

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