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Xps


jhb's Avatar
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09-07-05, 11:01 AM   #1  
jhb
Xps

I have a 16x16 addition over a crawlspace with pipes in it. I have insulation in the joists. I am thinking to use XPS insulating panels on the walls and a vapor barrier on the floor.

Can I install the XPS on the interior foundation walls with no ill effect, or should it really be applied to the exterior walls?

 
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Ed Imeduc's Avatar
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09-07-05, 11:18 AM   #2  
I think you better check the insulation up in the joist. With no V/B down on the ground Ill bet its wet up in there.
We only but insulation on the walls and in the joist space on sill plate all around the home or belt board. Then with a 6 mil poly down on the ground overlap 2' and tape all seams.

ED

 
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09-07-05, 12:13 PM   #3  
jhb
Almost answered my question.

So you apply your insulation to the interior of the crawl space? What type of insulation do you use, XPS, EPS, other?

 
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09-07-05, 07:30 PM   #4  
Most of the time 2"or 3" polystyrene

ED

 
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09-07-05, 08:26 PM   #5  
Xps

Use extruded polystyrene, not expanded (beadboard). The R-value is 5.0 per inch. Color is a function of brand name, not proprietary type.

Cyanurate is over R7, but not needed in this case.

Dick

 
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