Discussion Forum

Discussion Forum

general discussion

john2 | Posted in General Discussion on

Is a poly. vapor barrier required in this wall ? Site is a cold climate, Montana. It’s a 2 X 6 wall cavity with 2″ of  urethane foam and a 3 1/2″ fiberglass batt. Thanks John

Replies

  1. joeh | | #1

    John, you had it sprayed with foam? That is a vapor barrier. One is all you need, two is a no no. Joe H

Log in or create an account to post a comment.

Become a member and get full access to FineHomebuilding.com

Video Shorts

Categories

Discussion Forum

Recent Posts and Replies

  • |
  • |
  • |
  • |
  • |
  • |
View More Create Post

Up Next

Video Shorts

Featured Story

Repairing Damaged Walls and Ceilings

Skim-coating with joint compound covers texture, renews old drywall and plaster, and leaves smooth surfaces ready to paint.

Featured Video

Micro-Adjust Deck-Baluster Spacing for an Eye-Deceiving Layout

No math, no measuring—just a simple jig made from an elastic band is all you need to lay out a good-looking deck railing.

Related Stories

Highlights

Fine Homebuilding All Access
Fine Homebuilding Podcast
Tool Tech
Plus, get an extra 20% off with code GIFT20

"I have learned so much thanks to the searchable articles on the FHB website. I can confidently say that I expect to be a life-long subscriber." - M.K.

Fine Homebuilding Magazine

Fine Home Building

Membership & Magazine

© 2025 Active Interest Media. All rights reserved.

Fine Homebuilding receives a commission for items purchased through links on this site, including Amazon Associates and other affiliate advertising programs.