I work at a Ductile iron foundry and ran across some of this 900 paper in a 4ft. roll. Anybody know if a guy could use this stuff? 
THOUGHTS ON THIS PRODUCT FOR USE ON HEARTH PAD???
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jotul?
Burning Hunk
I've used a lot of Kaowool products repairing coke ovens here in the Pittsburgh area. Its great stuff, and I used the 2 inch blanket to insulate around my wall pass through (thimble). As far as building a hearth pad with it, I guess it would depend on your homeowners insurance requiring a UL listed hearth pad or not.
Yeah, i was thinking of laying a layer of this stuff between my 1" slab of marble and 3 durock sheets. We us it in our holding vessels and ladles before putting fire brick and refractory in. The iron is at 2,400 when dumped into these, external temps. measure 4-500 degrees F.
jotul?
Burning Hunk
What stove do you have? I know that UL listed pads provide 1.5R thermal protection, so I assume you've done enough research to know that your install requires this. Just from having real world experience with these products, I would say that the 900 paper would provide the insulation you need but I'm not an insurer, or refractory products rep.
I have the Pleasant hearth medium, 1800sq ft. stove, it requires r=2.0 I currently have a 1" slab of marble and 3 sheets of 3X5 next gen. durock below the marble, but still falling short. Seems crazy.
jotul?
Burning Hunk
It is crazy. When I got into this I had no idea that wood stoves required all this stuff. I had an OWB in the old house. Much less complicated. 1. Cut down tree. 2. Start fire with tree. 3. Turn up thermostat. I don't know much about your stove, I have a Jotul F600 that requires 1.5R, that is 90% installed. I have to get up on my roof tonight to put the last section of pipe on, and the roof brace, then I'm ready for break in fires! Anyway, keep posting and one of the senior members will pick this up. They're pretty busy this time of year. I'll keep an eye on this thread,but I really think it depends on what is required in your area for a safe or accepted install. I have faith in the Kaowool stuff but this isn't exactly its intended use. And remember, that marble provides no R value, any stone or masonry product will eventually heat up to the same temperature as whatever is touching it. Radiant heat in this case.
Hold off, your hearth may be fine. I heard from Pleasant Hearth yesterday. They are investigating the change from this spec just a couple years ago.
Note, an insulation blanket is not going to work as well under the weight of stone and cement board. It depends on air spaces in the blanket for it's insulating properties. They are lost if it is compressed. You need a solid, firm product that is not going to compress like kaowool board, mineral board, micore or similar product. I'm not sure about kaowool paper, it would seem like you would need several layers, but maybe it would work?
That would be great news if it was fine the way it is. I did have my engineer buddy review my hearth design, and well, he said you could park a semi on it if the sub floor would hold.lol. it would be nice to settle with the way it is though.
ridemgis
Feeling the Heat
We have an insurance company (FM Global) research lab here in RI that I've been fortunate enough to visit a couple of times. They run all sorts of burn tests in sample rooms of typical construction under code vs non-code conditions. When you see this stuff up close it becomes clear very quickly that the building inspector isn't making up rules just to annoy.
My three year old hearthstone has a pretty steep R value too and I spent about $800 on a super nice, old brick hearth pad because I don't have the skills or time to do it myself.
Set that sucker up for the semi and never lose a nights sleep worrying about fire outside the stove!
P
My three year old hearthstone has a pretty steep R value too and I spent about $800 on a super nice, old brick hearth pad because I don't have the skills or time to do it myself.
Set that sucker up for the semi and never lose a nights sleep worrying about fire outside the stove!
P
Good news. I heard back from Pleasant Hearth today. This is what they had to say:
Thanks for your patience.
I did get word back from Omni and our product team. They can use ember protection but thermal protection is not required. It would appear that the recent manual is incorrect, and they had already advised for an update.
Sorry for the confusion. And again, thanks for your patience.
Wow! Thanks for getting back to me on this "begreen" I had just bought the remaining 2 sheets of durock to make it a stack of 5 to achieve the 2 r value. That saves alot of work! Thanks again for your help. 
I am going to leave the 3 layers of durock in place under the marble and finish up the hearth as planned. I guess a little protection can't hurt. But 5 sheets durock plus the marble, that would have been crazy.
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