#1  
Old 03-07-2013, 06:17 PM
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Location: Canada
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Default Roxul RHT80 Hearth Floor

Hi,

Has anyone used Roxul RHT 80 for the hearth floor? I was looking for Cal-Sil but the hardware place recommended this instead. I ended up getting the 3 inch stuff...Will this work or will it compress too much? Thanks
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  #2  
Old 03-07-2013, 07:03 PM
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Default Re: Roxul RHT80 Hearth Floor

Quote:
Originally Posted by thebigt View Post
Hi,

Has anyone used Roxul RHT 80 for the hearth floor? I was looking for Cal-Sil but the hardware place recommended this instead. I ended up getting the 3 inch stuff...Will this work or will it compress too much? Thanks
I haven't used it but, the little search that I just did tells me that it is not what you want. I think that it will compress "too much" under the loads of a WFO.
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Old 03-07-2013, 07:10 PM
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Default Re: Roxul RHT80 Hearth Floor

The compressive strength looks pretty low in their technical data. They give two ratings, but even the better of them is in the range a 2.5 psi. That number is at 25%. For comparison I've found data for Cal Sil putting it at 100 PSI at 5% in the same test, ASTM C165. I can't find enough on ASTM C165 to tell you the exact meaning behind the percentages, but can tell you that in the same material the rating goes down as the percentage goes down, so this really does not bear well for the Roxul.
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Old 03-07-2013, 07:47 PM
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Default Re: Roxul RHT80 Hearth Floor

Thanks guys i really appreciate the advice...I will have to try and source out some Cal-Sil here...tougher to find in Canada as it mostly ships out of the US and the costs get pretty high
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Old 03-07-2013, 08:07 PM
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Default Re: Roxul RHT80 Hearth Floor

I believe that I can source this locally will this work http://www.brockwhite.com/files/Reso..._Prod_Data.pdf
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Old 03-07-2013, 08:32 PM
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Default Re: Roxul RHT80 Hearth Floor

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Originally Posted by thebigt View Post
I believe that I can source this locally will this work http://www.brockwhite.com/files/Reso..._Prod_Data.pdf
Thermagold 12 from Johns Manville is what I used for my oven. I think you will be fine. I hope you can get it for a decent price.
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Old 03-09-2013, 08:48 AM
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Default Re: Roxul RHT80 Hearth Floor

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Originally Posted by Gulf View Post
Thermagold 12 from Johns Manville is what I used for my oven. I think you will be fine. I hope you can get it for a decent price.
Yeah I found it locally unfortunately it would cost me 250 bucks since I'd have to buy a case. I'm looking at trying to locate it cheaper.
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Old 03-09-2013, 09:18 AM
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Default Re: Roxul RHT80 Hearth Floor

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Originally Posted by thebigt View Post
Yeah I found it locally unfortunately it would cost me 250 bucks since I'd have to buy a case. I'm looking at trying to locate it cheaper.
Ouch! that is high. I think the 2" thick has 7 pieces to a case. My oven is a little big, so that was a good number for me to insulate under the oven and entry. I used the extra for an insulated, though heavy, door.

Good luck on the search. There should be some "industial insulation supply" within driving distance that is cheaper than that price.
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Old 03-15-2013, 09:18 AM
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Default Re: Roxul RHT80 Hearth Floor

If you can get Foamglas, the insulation value is better (and no water can wick through from below). I capped mine with cal/sil, but I believe other members have put their bricks right on the Foamglas.
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Old 04-18-2013, 11:28 AM
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Default Re: Roxul RHT80 Hearth Floor

If I can jump in, Im having the same dilema roxul is readily availible and inexpensive and says it can withstand temps of 1200F for my dome is that enough?
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