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White Faced Polyiso Used As Finished Surface

 
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Old 07-07-2019, 10:40 PM   #1
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White Faced Polyiso Used As Finished Surface


A friend of mine is remodeling a very small house and he was trying to figure out how to keep the most headroom (sleeping loft) while also getting decent insulation. The place where he got his foamboard for the rafter bays advocated for this 1/2" white faced polyiso foam board instead of sheetrock. He said it could be taped and finished like drywall. They even had some installed in their office and I guess it looked fine.

Anyway-- I'm very interested to see how this stuff lasts and goes together as a vaulted ceiling. There is no tapered flat so its basically all butt. Another guy who used it said "DONT USE PAPER TAPE, wont adhere/hold up." I dont know what that's about.

I'll help him with it. I'm not a great finisher and he has almost no experience there. Should be a real car wreck!

Anyone heard of this? Seems like many pitfalls await him but it can always be covered by a layer of rock down the line.


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Old 07-07-2019, 11:41 PM   #2
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Re: White Faced Polyiso Used As Finished Surface


Haven't used it myself, but I do know that there is one foam board that is allowed in some jurisdictions to be used without an ignition barrier (aka drywall). I was also told that this is changing in the next code revision so that all foam board products in living space must have an ignition barrier.
I'm in residential and do almost no commercial space work so I don't know if offices get a pass on this requirement but you might want to look into it if you're subject to inspections.

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Old 07-08-2019, 06:16 AM   #3
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Re: White Faced Polyiso Used As Finished Surface


if it is a accessible space foam must be covered, it it has a door or open doorway or opening it must be covered.
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Old 07-08-2019, 07:31 AM   #4
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Re: White Faced Polyiso Used As Finished Surface


The first thing I thought was that it would not meet fire code. The code here is awfully lax IMO but I still think 1/2" drywall is required for ceilings. There wont be any inspections on this so that wont be an issue, just the molten foam napalm while you sleep part


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Old 07-08-2019, 09:15 AM   #5
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Re: White Faced Polyiso Used As Finished Surface


I'm not positive because they're not printed with any lettering, but I think this product is DOW Thermax White Finish foamboard


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