Forums | Home Repair | Home Improvement | Painting | Interior Decorating | Remodeling | Landscaping


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Insulation

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 09-20-2013, 07:53 AM   #1
Member
 
Join Date: Sep 2013
Posts: 32
Share |
Default

So I Need A Vapor Barrier


My house is like this - Vinyl siding to 1/2 inch fan fold foam board to house wrap to wall boards to 2x4 studs I will be extending the studs to 2x6 and fitting in Roxul R23 comfort batt. Once I put the Roxul in the the studs do I need to put on a 6mil plastic wrap for vapor barrier or do the other items i mention act as a vapor barrier? Central Maine is my loaction.
biddlecom is offline   Reply With Quote
Old 09-20-2013, 08:11 AM   #2
Member
 
Join Date: Nov 2011
Location: Hartfield VA
Posts: 24,477
Default

So I Need A Vapor Barrier


I would not do it, I believe that would form a double vapor barrier.
__________________
When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
joecaption is offline   Reply With Quote
Old 09-20-2013, 12:23 PM   #3
Member
 
ccarlisle's Avatar
 
Join Date: Jul 2008
Location: Montreal, Quebec, Canada
Posts: 1,889
Default

So I Need A Vapor Barrier


No. You already have an R1.5 3/8" thick vapour retarder on the outside and whatever you put up on top of the Roxul would be another vapour retarder. So the ability of vapour to travel inside to outside and/or outside to inside is reduced sufficiently to avoid condensation.

However, I'd put up gyproc walls and paint them - properly - with latex paint to have a good vapour retarder on the inside. Caulk the gyproc panels to the studs using sealant to reduce air movement - which is what does the carrying of the vapour.
__________________
“The average American woman is about 25 pounds heavier than she was in 1960...Recognizing obesity as a disease will help change the way the medical community tackles this complex issue that affects approximately 1 in 3 Americans,”

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
ccarlisle is offline   Reply With Quote
Old 09-20-2013, 06:19 PM   #4
Registered User
 
Join Date: Mar 2009
Posts: 9,875
Default

So I Need A Vapor Barrier


The fan-fold (1/2") may have a perm rating of 1.1 Perms; http://www.google.com/url?sa=t&rct=j...52434380,d.cGE

For your location, Zone 6; http://energycode.pnl.gov/EnergyCode...sp?state=Maine

With over 1 perm at sheathing, you are vapor semi-permeable and require asphalt faced paper, SVR, or v.b. paint next to the drywall, Fig.4a: http://www.buildingscience.com/docum...nd-wall-design

SVR; http://www.bestofbuildingscience.com...3-4_p37-40.pdf

Gary
__________________
Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!
Gary in WA is online now   Reply With Quote
Reply


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





Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.