Attic Vapor Barrier - Building & Construction - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction


Thread Tools Search this Thread
Display Modes
Old 03-08-2010, 03:18 PM   #1
Join Date: Oct 2009
Location: Indiana, PA
Posts: 1,419
Rewards Points: 736

attic vapor barrier

Should there be a vapor barrier between the atic and the conditioned room below it? Be it plastic liner or faced insulation with the face down? Thanks!
BlueBSH is offline   Reply With Quote
Sponsored Links
Old 03-08-2010, 04:19 PM   #2
concretemasonry's Avatar
Join Date: Oct 2006
Location: Minneapolis/St. Paul, Minnesota - Latitude 45.057 Longitude -93.074
Posts: 4,113
Rewards Points: 2,716

Yes. In your climate a vapor barrier should be on the warm side of the insulation as a simple answer.

A definition of a vapor barrier is not absolute, but is just a number selected to separate materials between being "vapor barriers" and not being " vapor barriers". all it takes is 1/2 mil of thickness to throw poly into a differen category even though they have a range from .5 to 6. Other materials can be much better. - On top of this is the installation that is even more importanr in the real world. Multiple layers may be used if the difference is below a specified limit, but few people are able to handle the calculation and design.

concretemasonry is offline   Reply With Quote
Sponsored Links

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Raccoons in the attic electricpete Pest Control 17 05-12-2011 04:02 AM
Recently Topped Up Attic with Blown Insulation...Now I have Frost/Condensation earthad1 Building & Construction 81 02-18-2011 12:42 PM
Finished attic humidity? kcrossley2 HVAC 2 08-11-2009 05:06 AM
Attic Fan AND Whole House Fan PapaGnome HVAC 6 02-15-2009 02:28 PM
Attic Frost cougar01 Building & Construction 5 01-28-2009 08:33 AM

Top of Page | View New Posts