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

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 11-05-2008, 02:23 PM   #1
Member
 
Join Date: Sep 2008
Posts: 36
Share |
Default

Vapor barrier in header area/between joists


I have insulated the header area of my basement between the floor joists (wood joists to wood header) and I was wondering what the best way to install a vapor barrier for these insulated areas is. I would love to find a simple and easy snap-your-fingers way to get it done but it seems to me that this is something that will be extremely time consuming...I.E. cutting poly to fit each individual space and sealing it all around with silicone(?).

Please inform me on the best methods to apply the vapor barrier to the header area.

Thanks!!

smorgdonkey is offline   Reply With Quote
Old 11-05-2008, 03:25 PM   #2
Member
 
concretemasonry's Avatar
 
Join Date: Oct 2006
Location: Minneapolis/St. Paul, Minnesota - Latitude 45.057 Longitude -93.074
Posts: 3,707
Default

Vapor barrier in header area/between joists


What makes you think you have to have a vapor barrier? - Since headers are over doors and windowa, you may dealing with two different conditioned spaces and not the usual situation between inside heating areas and the outside cold/unconditioned space.

If you are talking about the area inside a rim joist over a foundation wall, then a vapor barrier may be good on the warm side of the insulation if you are really concerned. In this case, immediately stuffing 1 1/2" thick precut extruded polystyrenr insulation between the joists immediately after you have foamed for air infiltration works well since the foam also acts as a adhesive. Then you can stuff in the pink junk to make yourself feel better. - After that, treat it like the rest of the basement if you are finishing off the space.

Between upstairs and downstairs, the difference in relatively humidity is really not much and the temperature difference is really minimal also. - You may be creating problems by micro-managing the details.

Dick


Last edited by concretemasonry; 11-05-2008 at 03:35 PM.
concretemasonry is online now   Reply With Quote
Old 11-05-2008, 09:13 PM   #3
Member
 
Join Date: Sep 2008
Posts: 36
Default

Vapor barrier in header area/between joists


Ok...maybe I am using the wrong terminology(?)...one of the upgrades suggested by my energy efficiency evaluation was to treat the 'header' area of the house. The header was defined as the part where the wooden structure meets the concrete basement. Directly above that are the floor joists and of course the bottom of the floor material.

I have insulated the open spaces on top of the foundation and I am thinking about enclosing those areas with the vapor barrier...just not sure how I should proceed as far as methods and such. Everything I have read says vapor barrier is the natural next step so that condensation doesn't become an issue.
smorgdonkey is offline   Reply With Quote
Old 11-07-2008, 08:34 AM   #4
Member
 
Join Date: Sep 2008
Posts: 36
Default

Vapor barrier in header area/between joists


Here is a diagram of the areas that I am referring to:


For the most part where the 3 points to...
smorgdonkey is offline   Reply With Quote
Old 11-20-2008, 11:31 AM   #5
Member
 
Join Date: Sep 2008
Posts: 36
Default

Vapor barrier in header area/between joists


No insight or ideas?
smorgdonkey is offline   Reply With Quote
Old 11-20-2008, 12:07 PM   #6
Mold!! Let's kill it!
 
Join Date: Feb 2008
Location: Central Pennsylvania
Posts: 2,833
Default

Vapor barrier in header area/between joists


Use kraftfaced fiberglass, snug fit or cut poly to fit over unfaced. Anytime I've ever done it, I cut a strip of poly an inch or so taller than the cavity, stapled it to bottom plate and the joists. Then went along with a razor knife and sliced down the middle of the joist and pushed it up into the space and stapled it.
Maintenance 6 is offline   Reply With Quote
Old 11-21-2008, 12:28 AM   #7
Member
 
Join Date: Jun 2008
Posts: 837
Default

Vapor barrier in header area/between joists


My suggestion is to get foam insulation sprayed in that whole location,,,it seals cracks,adheres and stops any leaky crack all at once AND gives good r-values. I have tried using fiberglass and the wind still blows thru and around them,,,no great way of sealing all that,,,specially on a leaky drafty OLD house and a brand new house will be old before ya know it!!
4just1don is offline   Reply With Quote
Old 11-21-2008, 06:54 AM   #8
Member
 
Join Date: Sep 2008
Posts: 36
Default

Vapor barrier in header area/between joists


Quote:
Originally Posted by 4just1don View Post
My suggestion is to get foam insulation sprayed in that whole location,,,it seals cracks,adheres and stops any leaky crack all at once AND gives good r-values. I have tried using fiberglass and the wind still blows thru and around them,,,no great way of sealing all that,,,specially on a leaky drafty OLD house and a brand new house will be old before ya know it!!
Good suggestion but it is already fiberglassed and there aren't leaks for wind to blow through.

It looks like poly and a knife are going to get a lot of time together...

smorgdonkey is offline   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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Insulate basement header with imbedded joists??? lackofunds General DIY Discussions 21 04-17-2011 03:41 PM
Sister or Replace Floor Joists brando1118 Carpentry 25 10-26-2008 08:43 PM
help with 2nd floor joists g heil Building & Construction 5 09-12-2008 06:41 PM
Best subfloor and material thickness nugentcn Flooring 7 09-07-2008 12:48 PM
Moving Header Supports Star Building & Construction 3 09-25-2005 12:50 AM




Top of Page | View New Posts

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