GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter X 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

3/4″ wood paneling directly over studs?

dfvellone | Posted in General Questions on

I’m installing 5/8″ plasterbase (blueboard) throughout my new construction, but will be using 3/4″ x 6″ wainscote @38″ height in two rooms. Exterior walls are all insulated with foam at the exterior, rockwool between studs, and covered with Membrain at the interior. Air sealing detailing has been meticulous at both exterior and interior.

Am I making a mistake by not installing blueboard or drywall beneath the wood paneling? (No code issue with it here).
Thanks, Daniel

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.


  1. Expert Member
    Michael Maines | | #1

    If you're in a cold climate, the only danger is that if the spray foam pulls away from the framing, which happens more often than people think, moisture could get to the sheathing and cause rot. I'd say the risk is low but not zero, and expensive to fix. I would add a variable permeance membrane over the studs before installing the boards. I typically spec Siga Majrex or Pro Clima Intello, but Rothoblaas, Certainteed and others have versions as well.

    1. dfvellone | | #2

      I'm sorry for the confusion, but there's no spray foam. The exterior of the house is covered with xps. Also, I've already installed CertainTeed Membrain throught the house.

      1. Expert Member
        Michael Maines | | #3

        My mistake, not enough coffee this morning! I see no reason to install drywall.

  2. xbcornwellco | | #4

    Nope! No reason for it unless you need a higher fire rating. We put T&G wood on all of our ceilings with a SIGA membrane, no drywall underneath. Only required in garages/etc.

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |