DIY Home Improvement Forum banner

Moisture under flooring

526 Views 2 Replies 3 Participants Last post by  SeniorSitizen
New to the site. Pulling up laminate flooring. Under the laminate is a plastic sheeting vapor barrier. Under the vapor barrier is old 12x12 glue down tiles circa late 1960’s. It is visibly wet under the vapor barrier and under the files. We live in the South. Is this normal condensation on the concrete slab? Or do I have a bigger problem? All thoughts welcomed appreciated.
1 - 1 of 3 Posts
It's normal if the concrete temperature reaches a temperature below dew point temperature. You outdoor side walk of concrete may have the same symptoms on a cool morning when the surface cools below dew point temperature. After you remove that plastic that shouldn't have ever been there, it's time to do some concrete surface temperature and dew point temperature monitoring to know which direction to take.

EDIT EDIT : We have concrete floors plus basement concrete ( carpeted ) with sheet vinyl and carpet ( ground floor ) without those problems in 37 years. Nothing under concrete except original soil.
1 - 1 of 3 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.