pouring over an old slab

Old 02-17-10, 07:19 AM
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pouring over an old slab

I have some 29.2'x16" bar joist that I want to use to expand my old carport that was poured back in the late 70's. Slab is in good condition about 14x16. I want to expand the size (20x30) and do a complete pour over the old slab (to get more elevation). If I am understanding right, I need to prepare the area and put a vapor barrier over the whole pour area, including the old slab?
Old 02-17-10, 05:48 PM
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Is that a studebaker hawk or a studebaker lark?

I don't know about the vapor barrier. What's more important is how much height do you want to add? As far as I know, you need to go at least 2 or 3 inches higher.
Old 02-19-10, 07:10 PM
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I think you would need the vapor barrier under the new addition for sure. If the old slab does not draw moisture to the surface now it probably does not need a vapor barrier under it.
But the plastic is cheap and it won't hurt anything for it to be over the old slab. I would put it under the whole thing and be sure you allow for proper drainage on the new addition.

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