GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Insulating a Slab on Grade and Moisture Control

RochelleHansen | Posted in General Questions on

I recently purchased an older home (1977) slab on grade with no insulation or vapor barrier under the slab, in fact it was poured on loose shell rock. I found all the tack strips on the outside walls have been wet and are almost rotted and I can smell mildew on the carpet edges when I pulled it up to paint. I’ve done lots of reading and can’t find a solid answer so: how do I stop the moisture from coming in and insulate the floor under the carpet and the bottom around the outside?

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.

Replies

  1. Paul_Miltenburg | | #1

    It might be from condensation and not moisture intrusion. The carpet acts as a slight insulation layer keeping the slab cool enough to condense the humidity in the room.

    Do a search on here for insulating basement floors for ideas on how to stop this.

  2. GBA Editor
    Kiley Jacques | | #2

    There are a number of details here that you might want to consider for your situation: Building Plans for Energy Efficient Basement Remodeling.

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |