Suspended concrete slab on OSB/joist floor
We are building a home with a 3″ regular concrete slab (not lightweight) with embedded radiant heat poured over a traditional TJI and 3/4″ T&G floor. The floor is engineered to hold the weight of the concrete of course. This will be the finished floor.
My question is, do we need to put any type of underlayment on top of the OSB (under the slab) before the pour. We want to be sure the concrete can dry appropriately. Do we just tape the seams of the OSB to keep the pour from leaking into the lower level or does it need a barrier of some sort?
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