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


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 06-09-2012, 11:51 PM   #1
Newbie
 
Join Date: Jun 2012
Posts: 4
Share |
Default

Gaps In XPS


Hi I have these panels of XPS covered with OSB. The OSB is shiplaped and is a very tight fit. However the 2 inch thick XPS behind it has 1/8th gaps at the seams. Is it necessary to fill these seams if the OSB is tightly sealed over the seams. It is below grade on an interior walkout blockwall foundation that is eight feet tall. Foundation is concrete block (8 inch) with full bricks mortared on the exterior. The panels are 2 inch of XPS and about 1/2 inch of osb with shiplaped edge on the osb. It is actually all already on the walls and I was posting to see if it would be beneficial to take down the panels and seal the seams with the spray foam or just make the osb airtight. I'm worried about the 1/8 " gap letting moisture vapor through to the OSB and creating a mold issue. I don't know enough about this stuff and convection currents to know if that is a realistic concern or not. Here are some pictures.
Attached Thumbnails
Gaps In XPS-barricadegap4.jpg   Gaps In XPS-barricadegap2.jpg  
drx006 is offline   Reply With Quote
Old 06-10-2012, 06:00 AM   #2
Remodeling Contractor
 
Join Date: Dec 2008
Location: Sandy Hook, CT
Posts: 3,590
Default

Gaps In XPS


Seal the gaps with spray foam. But OSB and the XPS will allow moisture to pass.
Bob Mariani is offline   Reply With Quote
Old 06-12-2012, 11:12 PM   #3
Newbie
 
Join Date: Jun 2012
Posts: 4
Default

Gaps In XPS


But OSB and the XPS will allow moisture to pass.[/QUOTE]

Thanks Bob. Does this mean that it would be ok to leave the panels alone without taking them down to seal the gaps? I was planning on putting up sheets of 1/4" wood paneling and staggering the seams over the OSB seams. If the osb seams are made airtight would that be enough to prevent any condensation mold issues in the xps gaps? How much benefit would I get from taking the panels down and sealing the gaps?

Last edited by drx006; 06-12-2012 at 11:15 PM.
drx006 is offline   Reply With Quote
Old 06-13-2012, 04:44 AM   #4
Remodeling Contractor
 
Join Date: Dec 2008
Location: Sandy Hook, CT
Posts: 3,590
Default

Gaps In XPS


none.... But stopping moisture is only one part of the puzzle. Moisture will still need to move through the structure in one direction (usually towards the outside.) The joints are sealed to stop air flow. Moisture will still be transferred by diffusion. You need to have enough insulation to keep the inside plane of the outside sheathing warm enough in winter to not reach the dew point. In cold climates this is R-11 for walls In basements you need R-13 tightly against the foundation wall.
Bob Mariani is offline   Reply With Quote
Old 06-14-2012, 12:10 AM   #5
Newbie
 
Join Date: Jun 2012
Posts: 4
Default

Gaps In XPS


One more question. If I decided to take down some of the panels to fill the gaps could something like this work? http://www.emseal.com/products/Archi...Backerseal.htm Or maybe cutting strips of 2 inch thick XPS to stuff in the gaps and then covering it with the fiber mastic before putting the OSB back up.. I'm trying to avoid using alot of sprayfoam as I read it has some toxic things in it like isocyanates.
drx006 is offline   Reply With Quote
Old 06-14-2012, 07:09 PM   #6
Remodeling Contractor
 
Join Date: Dec 2008
Location: Sandy Hook, CT
Posts: 3,590
Default

Gaps In XPS


it will work.
Bob Mariani is offline   Reply With Quote
Old 06-14-2012, 11:24 PM   #7
Newbie
 
Join Date: Jun 2012
Posts: 4
Default

Gaps In XPS


Thanks for your help!
drx006 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
Gaps in my hardwood floors jpc Flooring 3 06-18-2011 06:08 AM
cutting expansion gaps in underlayment boxy_brown Flooring 6 03-27-2010 04:54 PM
Step footing has gaps joshoc Building & Construction 4 05-06-2009 04:11 PM
Purpose of gaps between sheets of plywood? diy888 Tiling, ceramics, marble 35 02-16-2009 11:01 AM
baseboard trim gaps on stairs beppygirl General DIY Discussions 8 02-24-2008 01:31 PM




Top of Page | View New Posts

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