Personally i would surround the pieces with 25mm ceramic board and wire them together but if you dont think it is necessary to Insulate then you could try the method i use to fix my pizza oven castings together before insulating them. Or just wrap some wire around with small pieces of ceramic fibre on the corners. If the photo loads! ... you should be able to see the stainless steel staples i use imgur.com/CbaMHkT
Thinking about the different expansion rates of metal and the casting the staples the Martyn has shown make a lot of sense.The small mass means that you haven't got a big metal band that would take a lot longer to heat up & the fixing is very local , so to speak.Maybe wiring the whole thing together would work for this reason ? a great build for a first attempt , you seem to have a really good understanding of what's needed.Check out Matt Walkers stove chat on YouTube and maybe send in question?
I will probably start without side insulation and add some later if needed.
Nice pizza oven Martin ! I suppose you drilled the concrete before inserting the staples ? I would not dare using a hammer drill on my (precious ) castings... But yours seem way thicker !
Actually now that the base is flat, the 2 halves are almost holding themselves parallel to each other, and you need to apply a significant force to make them move because of their own weight.
Now I have added the vermiculite board on top, and cut it to the correct dimensions. The good side of it : it is very easy to cut with a handsaw for wood ! The bad side : after only 2 cuts on vermiculite, the handsaw will not cut wood anymore . It seems to be too abrasive for my poor saw !
I have used a 40mm wide wood piece to simulate the future Cobra.
And a 150mm steel tube for the riser (which will be later reduced to 100mm internal diameter with 25mm ceramic wool inside and outside).
I have bonded a 2mm thick ceramic fiber at the joint to have the good spacing and prevent air leaks (the ash would have done fine for the bottom part, but probably not for the vertical joint).
Before I read your message Martin I made a small U shape part with 2 flat angle steel brackets, riveted to a straight band. It is just holding the 2 halves with the good spacing but not applying pressure. When getting hot it will probably loosen even more.
I will try adding wire in other locations with protections in the corners.
And on this rainy day I started the very first fire !
Just a firelighter to begin. Then very very slowly adding a bit more fuel (I did not let the fake cobra burn entirely).
Very quickly, the flames were almost horizontal as if they were sucked by the port. That is encouraging for the future !
Not a clean burn yet but it should come later with higher temperatures ,secondary air (Cobra) and less primary air (door).
I did not see water vapor going out of the cast but perhaps it was not hot enough.
When touching the outside faces, the hottest part was near the bottom, just in front of the flames (who would have believed it ? ).
Truly amazing. Great work and great pictures. I like the bracket you made and I think if you had three more, one more on top, and one at the back around the riser bump out, and another at the front below the cobra channel feature, combined with the clever use of insulation as a gap sealer that you did, and you are golden.
The first couple of fires typically are not enough to drive steam out of the refractory, they are just to start the stress relief process and a tiny bit of curing. And with your style of box I'm not sure you will see steam or not. Just use caution not to go too big too soon.
If you insulate the inside of the riser with ceramic wool, I don't see the need for any on the outside of the riser. The riser will be inside the barrel/bell, right? It won't hurt anything, but I'm not sure it will provide any benefit.
I'm very happy for you and what you've been able to do so far. Thanks for keeping us updated.
Last Edit: Feb 9, 2021 20:29:27 GMT -8 by pigbuttons
One thing about the glass in the door. It needs to be able to grow and shrink freely, so don't tighten down the bolts too much. If you want to avoid leaks use braided firebox insulation available wherever fireplace inserts are sold.
Hi, I also think that you have done a wonderful thing. 2 remarks though: -have you planned something to close the air inlet? -I'm a bit worried about your glass door, when you're going to load your stove, if it doesn't open all the way (to come vertically), it greatly increases the risk of breaking the glass (a piece of wood falling out). From what I can see, your fireplace has to be high enough to allow for this maximum opening, but even so, it will not be able to swing open completely.
No I have nothing planned yet to close air inlets. Do you confirm the need to close them is only when the stove is not used, to avoid fresh air (and ashes) getting into the house ? You never close them during the burn correct ?
For the opening you are right as well. It will not open much more than 100° because the firebox will be close to the floor. So I guess I will need to be careful when loading. But in case the glass is broken, it can be easily dismounted and replaced for 10€.
it's a pity, you would have sent the drawing of your door project, we could have warned you of the potential problem. I confirm, it is necessary to close the air inlet when you stop the stove (when you go to sleep for example) to keep the heat, otherwise, the natural draft will cool the stove and the house ... (no problem of ashes)
TexasGonzo: Sooooo glad I found this site! Its always rewarding to find such a super group of folks! To any and all, feel free to PM me anytime. Thanks for having me!
Mar 11, 2019 18:56:41 GMT -8
jlmtech: GADGET: CONSIDER USING A JET PUMP INSTEAD OF A BLOWER FAN TO INDUCE DRAFT; NO CLOGGING.
Mar 26, 2019 8:19:28 GMT -8
michaelegan: i am unable to open the sketchup files on my mac. I used sketchup a few years back but apparently the company now requires a subscription. does anyone have any advice/instructions on how to use the program or how to view pictures without spending money?
Aug 20, 2019 18:41:48 GMT -8
mannytheseacow: michaelegan: download AutoCAD student version for free... import .SKP
Aug 23, 2019 13:33:44 GMT -8
topbaza: hi everyone, been searching all over net and this is were i need to be i think!!
Sept 28, 2019 6:16:25 GMT -8
anounaki: Hi, why I cant upload photos when I make new tread to this forum?
Feb 28, 2020 2:09:40 GMT -8
ahansen: photos under 1 mb not possible?
Jun 4, 2020 0:09:21 GMT -8
belgiangulch: Photo's are possible. They must be downloaded elsewhere and the image url (adress) is copyied.
Sept 14, 2020 7:26:15 GMT -8
belgiangulch: While creating a thread click on the small picture in the banner above the reply. A box pops up, paste the image url in the box. Pay no attention to the huge list of numbers and such.When you finish and hit reply your post with pictures will come up.
Sept 14, 2020 7:29:27 GMT -8
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?
Oct 21, 2020 6:53:59 GMT -8
BenAlexanderT: Happy new year everybody. I wish you the best
Dec 31, 2020 15:06:14 GMT -8
Solomon: Anybody in Southern Oregon, in Jackson or Josephine counties?
Jan 16, 2021 21:54:43 GMT -8
gnomedome: i realsie this is from 2009
Apr 14, 2021 8:30:44 GMT -8
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
Apr 14, 2021 8:32:00 GMT -8