Julian Adam

I will be using calcium silicate board to insulate the outside of my BBR core. It does not contain fibers, but of course you must still be careful with the silica. In my opinion, it is a viable alternative. It does not insulate as well as superwool, but you could go slightly thicker with it (e.g. 5 cm board instead of 2.5 cm blanket), or just accept that it will perform slightly less.
It's also not cost-prohivitive in my opinion.

https://www.broodoven.com/calcium-silicaatplaat-1000x500x50

Rico, Morgan Superwool may be ok to use while not yet exposed to high temperatures, but using it as a riser is, in my opinion, not a great idea. It will be toxic once you have to remove it. keep it for the parts of the heater which are exposed to lower temperatures, and even then tread carefully (especially when dismantling: at least wet it and use a mouth mask). I prefer to see it as a carcogenic until fully proven otherwise.

thomas rubino wrote:Hey Julian, Thank you.
Riser is 36"

Funny how the mind can play tricks, maybe it's the superwool that got me.

Great work Thomas and Gerry!
And thanks (again!) for documenting so well.
I just noticed the height of your riser is proportionally lower than what I have in my head. Are you at 8B length?
Keep it up!

I see you mention tomettes. Are you French(-speaking)? If so, maybe try looking for 'plaque d'égout en fonte ductile'. Based on the fact that the usual barrel over the J-tube can last for many years, I would think this would work well, assuming you put some stove rope / seal in the groove.

Hi Nina, I personally had thought about using a cast iron 'cistern cover' (not sure how to translate to English). They are quite readily available here, also second-hand, but it may not be the case for you.

Congratulations Tony! Seeing your finished product, I was wondering if you went through a lot of trouble separating the glass panel from its attachment points to the rest of the cooking hob? Seems like they often have the attachment points glued to them.

Denise Cares wrote: There is no diagram or explanation of the design. I thought I'd share it with Permies RMH experts and would like to know what you think of it. Is it practical and efficient and might it pass building codes in most states/countries?

As far as I can tell it is a Kuznetsov stove design with the corresponding 'dry seam'. (a lot) more complex to build over a batch box rocket with hollow bell, and I believe Peter did some testing to show that the efficiencies are not as high as a BBR.
You can find the Kuznetsov designs online as well. They use russian brick sizes though, which I believe is a problem.

I would like to add to Glenn; if you are using the buildup with insulation under the slab, if you have the option, it's best to use XPS or EPS. Especially XPS does not suffer from moisture, PUR (nowadays the standard insulation, at least here in the EU) does. I will be using XPS for my underfloor heating (backup/alternative to my RMH).

Matthias, if I may quote Peter, a bit higher up in this thread:

Peter van den Berg wrote: The DSR3 is a nice one, very spectacular to see it burn. Although complicated to build, some materials aren't available everywhere. But it is as self-regulating as a Shorty core which development followed logically after this one.

I read self-regulating as you don't have to do any fiddling with the air intake - it 'decides' itself to dampen the air intake. As I understand, most people don't touch the air intake on batchrockets, probably just loosing a few percents in efficiency. But you can hear what Peter has to say on the matter.