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Do I need a subfloor if I put rigid foam under slab?

791 Views 3 Replies 4 Participants Last post by  proudveteran
Hi Everybody,

I'm building a new home and the builder has an upgrade to add R10 rigid foam board under the slab. I'm planning to finish my basement. I'm still thinking about flooring options... do I need any kind of subfloor or vapor barrier... I would think not as it would create a pocket between the subfloor and rigid foam under the slab??

I might end up using engineered hardwood that can be floated on concrete slab...

Any ideas on whether I would need a sub-floor? Thanks in advance.

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