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thebigt 03-07-2013 07:17 PM

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

Gulf 03-07-2013 08:03 PM

Re: Roxul RHT80 Hearth Floor
 
Quote:

Originally Posted by thebigt (Post 147197)
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.

shuboyje 03-07-2013 08:10 PM

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.

thebigt 03-07-2013 08:47 PM

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

thebigt 03-07-2013 09:07 PM

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

Gulf 03-07-2013 09:32 PM

Re: Roxul RHT80 Hearth Floor
 
Quote:

Originally Posted by thebigt (Post 147210)
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.

thebigt 03-09-2013 09:48 AM

Re: Roxul RHT80 Hearth Floor
 
Quote:

Originally Posted by Gulf (Post 147212)
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.

Gulf 03-09-2013 10:18 AM

Re: Roxul RHT80 Hearth Floor
 
Quote:

Originally Posted by thebigt (Post 147285)
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.

vtsteve 03-15-2013 10:18 AM

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.

pizzaobsessed 04-18-2013 12:28 PM

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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