Basement Vapour Barrier - Building & Construction - DIY Chatroom Home Improvement Forum
Advertisement


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

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

Reply
 
Thread Tools Search this Thread
Display Modes
Old 10-27-2010, 12:44 PM   #1
Newbie
 
Join Date: Oct 2010
Posts: 6
Rewards Points: 10
Default

Basement walls


Do all the insulated basements walls need vapour barrier?
eickholdt is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-27-2010, 12:57 PM   #2
Newbie
 
Join Date: Oct 2010
Posts: 6
Rewards Points: 10
Default

Basement vapour barrier


I recently built a house with a walk out basement. The basement walls are
covered in Typar and Roxul insulation. Originally I was told to put vapour
barrier on the exposed wall (the walk out wall). Now I have been asked
to put vapour barrier on all the basement walls. Will this cause sweating
and a possible moisture problem?
eickholdt is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-27-2010, 01:00 PM   #3
Member
 
Join Date: Jan 2010
Location: Boston, MA
Posts: 275
Rewards Points: 250
Default


I assume the building inspector is asking you to do this?

Is it going to be a finished basement?
__________________
Everything I state on this forum is an opinion I have developed based on my experience and research as a professional.
wnabcptrNH is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-27-2010, 01:02 PM   #4
Member
 
Join Date: Jan 2010
Location: Boston, MA
Posts: 275
Rewards Points: 250
Default


Honestly I am not sure of the code in your area or this is national code but if you are building a wall in a basement and insulating it, you should put up vapor barrier. I can say that most people in this forum would agree.

If you dont and you have moisture coming through the concrete it will cause mold to grow on the back side of the drywall. Make sure you tape all your joints and seal the bottom of the VB with acoustical sealant to the base plate. Be sure to tape around all electrical boxes or any type of penetration.
__________________
Everything I state on this forum is an opinion I have developed based on my experience and research as a professional.

Last edited by wnabcptrNH; 10-27-2010 at 01:05 PM.
wnabcptrNH is offline   Reply With Quote
Old 10-27-2010, 01:03 PM   #5
Newbie
 
Join Date: Oct 2010
Posts: 6
Rewards Points: 10
Default

basement insulation


Yes the building inspector stated this (oringinally he said to put vapour
barrier only on the exposed wall). Eventually I will finish the basement,
but not immediately. I am concerned that moisture will be trapped behing
the insulation and cause a problem.
eickholdt is offline   Reply With Quote
Old 10-27-2010, 01:06 PM   #6
Newbie
 
Join Date: Oct 2010
Posts: 6
Rewards Points: 10
Default

basement insulation


The building inspector did request that all the basement walls need vapour
barrier. Originally he only said to vapour barrier the exposed walk out
wall. I am concerned that moisture will develop behind the Roxul or
on the concrete wall behind the Typar.
eickholdt is offline   Reply With Quote
Old 10-27-2010, 01:07 PM   #7
Member
 
Join Date: Jan 2010
Location: Boston, MA
Posts: 275
Rewards Points: 250
Default


The issue here is that the concrete wall will get cool and the basement would be warm causing condensation. If it were me I would see if he would allow me to put up 2" foam on the walls with taped joints since thats what i like to do when I finish basements anyway.
__________________
Everything I state on this forum is an opinion I have developed based on my experience and research as a professional.
wnabcptrNH is offline   Reply With Quote
Old 10-27-2010, 01:12 PM   #8
Newbie
 
Join Date: Oct 2010
Posts: 6
Rewards Points: 10
Default

basement insulation


The building inspector did request that all the basement walls need vapour
barrier. Originally he only said to vapour barrier the exposed walk out
wall. I am concerned that moisture will develop behind the Roxul or
on the concrete wall behind the Typar.
eickholdt is offline   Reply With Quote
Old 10-27-2010, 01:46 PM   #9
Member
 
Join Date: Jan 2010
Location: Boston, MA
Posts: 275
Rewards Points: 250
Default


Are these concrete walls or framed walls? I assume by your description now, framed walls.

Humm never heard of an inspector asking to vapor barrier a concrete wall.
__________________
Everything I state on this forum is an opinion I have developed based on my experience and research as a professional.
wnabcptrNH is offline   Reply With Quote
Old 10-27-2010, 04:57 PM   #10
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Rewards Points: 2,000
Default


2 threads on same issue merged



Scuba_Dave is offline   Reply With Quote
Old 10-27-2010, 07:28 PM   #11
Registered User
 
Join Date: Mar 2009
Posts: 11,730
Rewards Points: 526
Default


WHERE are you located?

Gary
__________________
If any ads are present below my answer or words underlined/colored, I do not condone/support/use the product or services listed/linked to, they are there without my consent.
17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
Gary in WA is offline   Reply With Quote
Old 10-28-2010, 06:23 AM   #12
Member
 
Join Date: Dec 2008
Location: South Western Ontario
Posts: 955
Rewards Points: 500
Default

imho


Check your codes and know your requirements. Read up on typar, it is a breathable film. I do not believe it is a vapor barrier, but an air a barrier.
6 mil poly would be the standard for vapor barrier for my local codes.
Typically in my area a vapor barrier would be installed behind the drywall, however in abasement it is not sealed to the bottom plate so as to allow the wall to breath where it meets the floor.
Foam insulation adhered directly to the wall behind your studs creates a different scenario. FYI Roxul is moisture and mold resistant. Another great Canadian product....
Chemist1961 is offline   Reply With Quote
Old 10-28-2010, 05:56 PM   #13
Ultimatetouch
 
Join Date: Oct 2010
Location: Illinois
Posts: 49
Rewards Points: 25
Default


Prior to framing a wall in front of the foundation to finish basment, you should first install 1" polystyrene insulation and tape the seams. It does two things. It insulates and it helps keep the moisture in the concrete and not in your walls. This method is part of every basement remodeling project that we do. Even better frame a stud wall one inch away from the foam. Leaving an air gap. You should be fine unless you have basement foundation trouble.

__________________________________________________ _______________
ultimatetouch is offline   Reply With Quote
Old 10-28-2010, 10:14 PM   #14
Member
 
Join Date: Dec 2008
Location: Fairbanks, AK
Posts: 1,941
Rewards Points: 1,188
Default


If your basement walls are against dirt, I do not think you want a true vapor barrier on them. The wall will need to breathe to the inside because it can't do so to the outside. I'd suggest the air-tight drywall approach to stop air from going into the wall. If there is moisture coming in, then I would not recommend sealing the wall on the inside; go outside and seal the wall. Check on buildingscience.com, etc, and I think you'll see that generally vapor barriers in basements are a mistake.
jklingel is offline   Reply With Quote
Old 10-29-2010, 07:52 AM   #15
Member
 
Join Date: Jan 2010
Location: Boston, MA
Posts: 275
Rewards Points: 250
Default


UP here in the northeast its 2"


[QUOTE=ultimatetouch;524542]Prior to framing a wall in front of the foundation to finish basment, you should first install 1" polystyrene insulation and tape the seams. It does two things. It insulates and it helps keep the moisture in the concrete and not in your walls. This method is part of every basement remodeling project that we do. Even better frame a stud wall one inch away from the foam. Leaving an air gap. You should be fine unless you have basement foundation trouble.

__________________________________________________ _______________
__________________
Everything I state on this forum is an opinion I have developed based on my experience and research as a professional.
wnabcptrNH is offline   Reply With Quote
Sponsored Links
Advertisement
 
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
At a crossroads in my basement project - waterproofing help needed callisto9 Building & Construction 37 07-06-2015 07:40 AM
Vapor barrier requirement for finished basement JTK Building & Construction 13 02-05-2011 04:30 PM
Denshield and Vapour Barrier doitokay Building & Construction 5 03-17-2010 06:50 AM
Sealing a vapour barrier in garage PatS General DIY Discussions 4 10-25-2008 08:51 AM
Basement Moisture problem jimdd Remodeling 1 07-22-2008 02:48 PM




Top of Page | View New Posts