Xps Vs Eps As A Thermal Break????? - Insulation - DIY Chatroom Home Improvement Forum
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Old 03-25-2015, 05:12 PM   #1
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xps vs eps as a thermal break?????


I guess true studies haven't been done on eps. What are your guys thoughts since eps is cheaper...
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Old 03-27-2015, 09:25 AM   #2
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Seems to work pretty good in coffee cups.
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Old 03-27-2015, 12:16 PM   #3
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EPS will absorb more moisture then XPS.

XPS has a slightly higher R-value.

Depends on what you are thermally breaking.
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Old 03-27-2015, 12:18 PM   #4
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+1

Need to know application.
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Old 03-27-2015, 03:40 PM   #5
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The difference in water absorption can make a considerable difference in insulation since moisture can reduce the insulation (as it does for all materials) in the real world.

"R" value tests are short term tested on dry materials in pristine condition for advertising claims, so the moisture reduces the insulation more for EPS than XPS that will not absorb as much moisture in the real world. - Still not as bad as fiberglass that just holds moisture for almost forever.

Dick
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Old 03-29-2015, 10:31 PM   #6
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is it necessary to waterproof paint on the cinder blocks before installing the xps?
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Old 03-30-2015, 07:00 AM   #7
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Inside surface? No and actually not recommended.
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Old 03-30-2015, 07:57 AM   #8
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+1 the exterior needs to be waterproof.
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Old 03-30-2015, 08:47 AM   #9
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Quote:
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Inside surface? No and actually not recommended.
Yes interior and why not?
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Old 03-30-2015, 11:57 AM   #10
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Yes interior and why not?
Do you have moisture coming inside the walls currently?
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Old 03-30-2015, 12:45 PM   #11
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Water infiltration needs to be addressed on the outside with gutters, grading and downspout extensions.
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Old 03-30-2015, 01:47 PM   #12
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Quote:
Originally Posted by wantboost View Post
Yes interior and why not?
It will form a vapor trap and there is nothing about that waterproofing paint that works, so why use it?

As stated directly above me, the water infiltration must be addressed from the exterior (ideally) or interior via drainage board and interior sump.
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Old 03-30-2015, 03:16 PM   #13
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Quote:
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Do you have moisture coming inside the walls currently?
Only at one spot. And slight amount of water. Due to a crack on the outside parging
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Old 03-30-2015, 03:27 PM   #14
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Quote:
Originally Posted by wantboost View Post
Only at one spot. And slight amount of water. Due to a crack on the outside parging
That should be fixed first before any interior finishes. The paint ect doesn't work, and if it does happen to work in this case will trap moisture in the foundation, not a great place for it to be.
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Old 03-30-2015, 03:28 PM   #15
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Yes obv. I will fix that first. Ok i wont use the paint. Thx!
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