DIY Home Improvement Forum banner

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

796 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.

1 - 1 of 4 Posts
basement gamble

as stated earlier in this thread without a history you really have no idea what is going to happen. It sounds like what the builder is offering is great in regards to keeping temperature changes to a minimum, but I do not believe that there is any type of moisture benefit with the product you mentioned.
What are the soil conditions in the area?

Does everyone in your area have basements? Do they have issues with water finding its way in?

Has the builder done what they should of in regards to making the outside of the basement water tight? And are there drainage pipes all the way around the foundation to help bring any type of water that is trying to get in away from the basement?

All items to take into account.

safe wau to test it out is to install something that will not break the bank it it does fail

Example..... textured vinyl has teh same appearance as engineered hardwoods when installed properly

Good luck
See less See more
1 - 1 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.