John Sayers' Recording Studio Design Forum Archive

Dear all,

I need your guidance to install a vapor barrier in the control room I’ll build in my home’s basement (4 concrete walls, a heated room above)
Question A:
Option 1: fix the vapor barrier to the concrete wall’s partition and then deploy it on the inner leaf studs.
 Will that defeat the whole room within a room concept?
Option 2: place the vapor barrier on all 4 walls + ceiling

Question B:
Can I install the vapor barrier sandwiched between the studs and the drywall or do I have to build a 2nd stud to leave an air gap between the vapor barrier and the drywall (Fermacell)?

Details about the construction can be found here:
viewtopic.php?f=1&t=20670

Check your local building code and regulations to find out for sure if you even need a vapor barrier in your climate and situation! You might find that you don't need one at all.

If you DO need one, then it will always go inside the wall cavity, on the side that is warmer when the humidity is highest. For most places, that means the side that is "warmest in winter". If that is your case, then the vapor barrier goes between the studs and the drywall on your inner-leaf wall.

But don't take my word for it: check what your local building practices and regulations say.


- Stuart -

Hey Soundman2020, thanks for your reply,

I understand that I have to place it on the warm side.
It's the case in both pictures I posted here (the barrier is in translucid blue).

Should I connect its end :
1) to the outer wall (concrete)?

Or

2) to the end of the inner partition's wall touching the ceiling?
-->in that case should I also install a vapor barrier on the ceiling?

Sorry if my explanations are not very clear...