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Old 01-14-2010, 04:24 PM   #1
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Basement XPS and Batt insulation?


Was just wondering about this, we want to have 2x4 walls jus because of the pipes we want to cover up and such in the unfinished basement.. can we put 1" of XPS foam on the wall first, glue it up, seal it's cracks up with tyvek tape, then build the walls frame infront of that and then fill the walls up with batt insulation? our area requires R-10 minimum in conditioned spaces the 1 inch foam would give us R-6.5 then the batt insulation would add another R-13... any problems with this? everything would be drywalled over in the end

it would look like this basically
http://i.ehow.com/images/GlobalPhoto...-main_Full.jpg

also is there any big difference between Johns Manville batt insulation and Owens Corning? OC costs almost twice as much where I am at....


Last edited by BlueBSH; 01-14-2010 at 04:27 PM.
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Old 01-14-2010, 07:51 PM   #2
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Basement XPS and Batt insulation?


Johns Manville is formaldehyde free. You can't go wrong with them. R value is R value.

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Old 01-16-2010, 03:13 PM   #3
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Basement XPS and Batt insulation?


Good plan! But use unfaced foam board: http://www.buildingscience.com/docum...ent-insulation

Be safe, Gary
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Old 01-16-2010, 06:15 PM   #4
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Basement XPS and Batt insulation?


Quote:
Originally Posted by GBR in WA View Post
Good plan! But use unfaced foam board: http://www.buildingscience.com/docum...ent-insulation

Be safe, Gary
when you say unfaced foam board, you mean the stuff that doesnt have a paper or metalic backing on it right? just the stuff where both sides are foam
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Old 01-16-2010, 07:01 PM   #5
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Basement XPS and Batt insulation?


Yes, as per Building Science, the more permeable (thinner), the better.

The best foams to use have a perm rating of greater than 1 perm for the thickness used. This means limiting extruded polystyrene insulation to less than 1-inch thickness for walls (more than 1 inch thick and they do not breathe sufficiently) and making sure that the rigid insulation is not faced with polypropylene skins or foil facings. From: http://www.buildingscience.com/docum...gs?full_view=1

Be safe, Gary
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Old 01-17-2010, 08:57 AM   #6
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Basement XPS and Batt insulation?


Thanks for the link GBR in WA. I really liked it because it strongly confirms that we are building (slow but surely) in the right direction.

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