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second slab

Posted by David on January 5th, 2003 10:43 AM
In reply to float a slab by Mongo on January 4th, 2003 01:51 AM [Go to top of thread]

Kelly, as Mongo mentions, this is another option, but should only be used if you have the height available. To ward off the new slab cracking, which often happens directly over the existing cracks, it should be a minimum of 3 " thick in the shallowest areas. Even then there's a fair chance the new slab will eventually crack on these points. I personally tend to not put a second slab in direct contact with an existing slab which has cracked and shown much movement, but place a sand bed a few inches thick between them.

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