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Is glue necessary for hard foam to cinder block ?


Crane15's Avatar
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05-06-14, 06:21 PM   #1  
Is glue necessary for hard foam to cinder block ?

Hi, I am finishing a small utility room in my basement. The walls are cinder block. I have my hard foam already cut to fit - and they fit snug in between the furring strips.

My question is, is glue necessary between the cinder block and hard foam ?
I can't think of a reason for it being necessary, other than to help hold it in place (which is not needed in my case).

 
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chandler's Avatar
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05-07-14, 03:17 AM   #2  
The foam, in essence will form a thermal break between the block and the living space. It should be continuous and not broken up as you have described. Your wall should be built about 1" away from the foam. Gluing ensures the foam and wall become one. It should be taped at all seams as well.

 
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05-07-14, 06:54 AM   #3  
I've occasionally had to furr and insulate a wall, and in an effort to keep it as thin as possible I put 3/4 foam horizontally then applied 3/4" furring over it 16" o.c. then put 14 1/2" rips of insulation between. That first solid layer provides an unbroken air barrier when the seams and edges are sealed. So I get what Larry is saying about all the cut edges. But I don't think glue is needed if you plan on covering it with sheetrock. i would think about another layer of foam over your furring thoug and then tape the seams to keep air out.

 
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