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Super Tough R as underlayment?

Posted by veloguru (My Page) on
Wed, Nov 16, 11 at 16:05

Hi, I am finishing a basement. I installed 1" ISO under the slab, and was thinking about laying 1/2" Super tough R panels on top of slab, then basement approved laminate flooring directly on top of that. I would also Tape all seams with Tyvek. Thought it would provide a moisture barrier as well as making the floor less cold. I don't have the headroom for a more elaborate insulation/subfloor system. Any thoughts? Thanks.

Follow-Up Postings:

RE: Super Tough R as underlayment?

Polyiso is commonly available in compressive strengths of 16-25 psi , adequate for roofs where foot traffic is limited to installation and maintenance, not for an occupied basement.

Instead, use XPS, which comes in normal strengths of 40-100 psi.. But it must be followed by one or two layers of ply.

If you want to forego the insulation, use a bubble membrane product, such as Delta FL.

Before applying laminate, be sure the manufacturer warrants it for basement use and use the subfloor materials recommended.


Polyiso under the slab is isn't very effective either.

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