02 Apr '13, 1am

Support or not support slab. #green

I have designed a wall with an insulated slab supported on one edge as described on this site and also Building Science's paper "Slab Happy". See drawing below. My builder doesn't like this because of the extra labor and material costs and concerns about the slab on the edge of the stem wall, possibly leading to cracking He prefers to not support the slab and let it float within the stem wall as per drawing two. I am concerned that this is more prone to movement and cracking if there is any settling. Both would have compacted soil and some sand or gravel underneath the slab. Can I get your feedback on pros and cons please.

Full article: http://www.greenbuildingadvisor.com/community/forum/green...

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