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05-29-2012, 02:12 PM
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#1
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Member
Join Date: Jan 2012
Location: Northern Virginia
Posts: 524
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Must you secure XPS foam to basement walls?
Hi All,
I plan on insulating my basement with 2" XPS foam over the concrete block walls. Should I secure the foam to the wall with some PL300 or can I just frame up against it and let the wood hold it in place?
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05-29-2012, 02:27 PM
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#2
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Exterior Construction
Join Date: Aug 2011
Location: VA, MD, DC
Posts: 3,493
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Must you secure XPS foam to basement walls?
If you are framing it up soon thereafter, you don't need a ton of glue.
Just stick it to the wall and makes sure that you shim it tight against the framing once you finish out the framing portion of the project so there is some force applied to the foam to keep it tight to the wall.
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05-29-2012, 02:31 PM
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#3
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Member
Join Date: Jan 2012
Location: Northern Virginia
Posts: 524
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Must you secure XPS foam to basement walls?
Thanks Eric!
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05-29-2012, 03:38 PM
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#4
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Exterior Construction
Join Date: Aug 2011
Location: VA, MD, DC
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Must you secure XPS foam to basement walls?
Yep!
Take me to play Westfields and we will call it even.
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05-31-2012, 01:55 AM
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#5
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Moderator
Join Date: Mar 2009
Posts: 8,775
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Must you secure XPS foam to basement walls?
It's imperative to air-seal the concrete from the room air; http://joneakes.com/jons-fixit-database/743 (From one of our new members)!
Pages 8, 11, etc.; http://www.buildingscience.com/docum...lation-systems
Sill sealer under the p.t. bottom plate (air/thermal/capillary break), ADA the drywall, everything to keep that room air from the cold concrete: http://www.buildingscience.com/docum...wall-approach/
Gary
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05-31-2012, 12:43 PM
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#6
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Member
Join Date: Jan 2012
Location: Northern Virginia
Posts: 524
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Must you secure XPS foam to basement walls?
Thanks Gary.
Off the subject a little bit, I plan on cutting in an interior weeping tile system against the footer. Should I use one of those dimpled membranes against the wall and then the XPS insulation or not even bother with the membrane?
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05-31-2012, 02:22 PM
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#7
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Exterior Construction
Join Date: Aug 2011
Location: VA, MD, DC
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Must you secure XPS foam to basement walls?
Jeff,
I will renew my offer to take a look at it for you but I am pretty firmly convinced that you will be wasting your money if you do that. I think most of your issues are drainage and condensation related. Fix the gutters ant the wells and you will be fine.
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06-01-2012, 01:58 PM
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#8
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Moderator
Join Date: Mar 2009
Posts: 8,775
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Must you secure XPS foam to basement walls?
No, glue the f.b. directly to the concrete wall with vertical beads only, not to trap moisture. continuous bead along top edge, Enka (or similar) at concrete wall/new slab joint and under replaced area for drainage, Fig. 15; http://www.buildingscience.com/docum...lation-systems
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!
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06-01-2012, 04:02 PM
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#9
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Architectural Designer
Join Date: Jul 2011
Location: Connecticut
Posts: 1,363
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Must you secure XPS foam to basement walls?
Quote:
Originally Posted by GBR in WA
No, glue the f.b. directly to the concrete wall with vertical beads only, not to trap moisture. continuous bead along top edge,
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The underlined statement is in direct conflict with your first link. It states to place glue in a grid pattern to mitigate convective currents...
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06-02-2012, 12:29 AM
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#10
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Moderator
Join Date: Mar 2009
Posts: 8,775
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Must you secure XPS foam to basement walls?
In post #6, Trucon01 added a different scenario, I changed-up and switch hit because the new slab drain is linked to the concrete wall for clear drainage. Horizontal glue beads would create ledges for the moisture to pocket and soak in to the foam board. Price you pay for draining there, a slight R-value reduction. Glad you read the links though, nice catch!
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!
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