Post by mthomestead on Jul 26, 2017 13:35:28 GMT -8
Hello, I getting ready to order materials for my batch box build. I was planning on using heat cast 40 for the fire chamber and riser, with heat stop 50 as the mortar for the fire brick bell. The skin of my bell will be 3" natural stone and was thinking troweling on thin layer of Insul stick on the outside of the firebrick before I place the stone. Am I on the right track with this materials? Here are links to the products.
I have access to the same materials locally, so I am considering using them as well.
Question mostly for Peterberg (I've enjoyed many of your posts): In my application, I would like to cast the walls and roof of the firebox as well as the riser...would you recommend adding perlite to the Heat Cast 50 to reduce the mass of these components? I understand the chance that perlite might melt in in the riser...is that a problem structurally? As far as insulation goes, the remaining air pockets will still provide insulation. As a side note, the Heat Stop product insul-cast appears to be rated to only 2000F...is that sufficient for the riser and/or other components?
It's either Heat Cast 40 or Heat Stop 50, Heat Cast 50 isn't mentioned at the site. The Heat Cast 40 is the proper castable refractory as far as I know. Please don't add anything to it, the aluminum cement, being the binder is the most expensive part, its content is precisely what is required in order to get a good bond. When you add something, the bond will be weaker inevitably. The casting will be mildly insulating as it is, density is quite normal what they say at the site. More insulation around it would help, of course.
Most of the time insulating the firebox doesn't add anything, the riser is the part that should be hottest. Perlite will melt when the thing burn two batches back-to-back. It will soften at a temperature around 1600º F, the Heat Cast 40 product is rated 2500º F and that isn't a luxury.
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deadstarsstillburn: Hi there. I was directed this way by folks on the Permies.com website and am hoping I can get some information on how a total newbie can get started designing, siting, building, and not-dying-in-a-horrible-house-fire with a new RMH in a 160-year old home
Oct 21, 2020 6:52:10 GMT -8
deadstarsstillburn: The people over there recommended either a 6" batchbox or an 8" J-tube. I don't know what those are but am going to try to figure that out. What I need is a blueprint that I can scale to fit the need for my house. I have something likne 5000 square feet
Oct 21, 2020 6:53:00 GMT -8
deadstarsstillburn: but I do not need to heat all of it by any means. probably only need to heat half of that, maybe less.
Oct 21, 2020 6:53:15 GMT -8
deadstarsstillburn: moreover, the house has 3 storeys (large attic) so I assume if I get very efficient heating on the ground floor, that will go a long way toward heating the upstairs as well, no?
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gnomedome: i realize this is from 2009 id love to see the photos from this ..as im looking to build a sauna soon similar to this .... if anyody sees this post firstname.lastname@example.org..... the photos in this post did not show up
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