wrote in message
oups.com...
pouring a slab foundation on top of existing 4 inch concrete patio.
code calls for 2 inches of sand on top of 10 mil visqueen.what do you
guys think? should i just roughen it up and pour on top? Visqueen is
there as a vapor barrier.

Does not matter what I think. If the inspector thinks different, you have a
problem. Run it by him first. If the slab is for a 10 x 8 shed and no
permits and inspection required, you may be OK. Otherwise, it will be very
expensive to tear out if the inspector does not buy it.