Polyethylene and Drywall
Polyurethane
| Posted in General Questions on
Can you put 4 mil poly on drywall inside the house and put another layer of drywall over the poly
GBA Detail Library
A collection of one thousand construction details organized by climate and house part
Search and download construction details
Replies
Why would you want to?
They are 6 in exterior walls with 3/8 rock on them and each stud they shot foam both side's so it's a bitch to Demo on the outside of the wall just built right no Tyvek
Polyurethane,
What Patrick is suggesting is that you can get the attributes you want from poly - that is an effective air-barrier and vapour retarder - by sealing the existing drywall, and if necessary coating it to reduce its permeance.
See also: https://en.wikipedia.org/wiki/XY_problem
Very insightful. From the linked article:
"Q: How can I use X to do Y?
A: If what you want is to do Y, you should ask that question without pre-supposing the use of a method that may not be appropriate. "