Rubber underlay epoxy issues

We have a concrete floor with underfloor heating. The concrete is dry. We are having issues when laying the glue down rubber underlay as it expands when bonding with the epoxy or curls up unexpectedly/unevenly in places and the exposure the drains into the space and makes ridges. How do we stop this from happening? We are installing a hardwood glue down floor over it.

Asked by Catherine on 26th May 2026
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