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Old 05-27-2018, 04:34 PM   #1
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Floor insulation

Ready to lay flooring insulation.
I’ve been told—given the very very good condition of the metal sheeting—that I don’t ‘need’ to paint it first. But it’s a shortie and we’re only talking ~15 feet, so I want to paint it. Rustoleum, yes?
Now, the rigid insulation: should it be polyiso R-max or the pink / blue stuff (xps?).
Please give your reasoning; I’ve read so many conflicting “use THIS” responses.
Also (if it matters) I am NOT framing the floor, though I will sheet over the foam with plywood.
Thanks!
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Old 05-27-2018, 04:49 PM   #2
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No matter the condition, painting the floor is preventive maintenance, Rustoleum is what a lot use. IMHO, I doubt you would see much performance difference between the foam boards.
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Old 05-27-2018, 04:58 PM   #3
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No matter the condition, painting the floor is preventive maintenance, Rustoleum is what a lot use. IMHO, I doubt you would see much performance difference between the foam boards.
Yes, I thought preventative was a swell idea.
Thanks for taking time to respond.
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Old 05-27-2018, 06:06 PM   #4
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Originally Posted by o1marc View Post
No matter the condition, painting the floor is preventive maintenance, Rustoleum is what a lot use. IMHO, I doubt you would see much performance difference between the foam boards.
Yes, I thought preventative was a swell idea.
Thanks for taking time to respond.
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Old 05-27-2018, 06:17 PM   #5
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The difference in polyiso and xps from what I've been reading, is only in cold so if you plan on staying out of harsh cold you shouldn't see a difference
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Old 05-27-2018, 06:27 PM   #6
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The difference in polyiso and xps from what I've been reading, is only in cold so if you plan on staying out of harsh cold you shouldn't see a difference
I’d like to be prepared for any situation 👍
I think I’ll go with the XP’s on the floor.
If I’ve researched enough, am I correct that I won’t need a vapor barrier underneath either the foam or plywood?
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Old 05-27-2018, 06:53 PM   #7
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The difference in polyiso and xps from what I've been reading, is only in cold so if you plan on staying out of harsh cold you shouldn't see a difference
And just how significant is that difference?
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Old 05-27-2018, 07:19 PM   #8
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From what I've read it's not huge, the bigger difference is in the foaming gas from brand to brand and how fast they off gas and lose R value
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Old 05-27-2018, 09:16 PM   #9
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There is a no doubt biased article from owens corning. Search polyiso versus xps.

Xps absorbs more water if exposed and at 15f the r value drops from 5 to 2 . . so for the floor I would stay away from xps.

Later j
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Old 05-27-2018, 10:20 PM   #10
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There is a no doubt biased article from owens corning. Search polyiso versus xps.

Xps absorbs more water if exposed and at 15f the r value drops from 5 to 2 . . so for the floor I would stay away from xps.

Later j
I've read alot on it from different sources. The gist of what I got is there are people in the industry pushing for better real life measure of R value because of the life span of foaming gases, some have larger molecules and permiate the foam cell wall more slowly and the gases have better insulation property than air.

By the numbers alone xps looks better and does perform better in heat, but the cheaper pink board seems to be longer lived and performs the same in heat and cold, but at a slightly lower R rating

I'm not an expert, that's just what I got from researching because I live in Wisconsin and don't want to be cold.
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