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Post by oblertone on Jun 17, 2015 18:15:24 GMT
Apparently the mortar burns out at the temp of a WFO so mixing powdered clay is recommended to provide a fixative at higher temperatures; this is only my understanding but I used 'home brew' at 3-1-1-1 (sand/cement/lime/clay) and it seems to be doing the job so far.
ps - If you need more heater blocks then I've got a dozen left, yours foc.
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Post by oblertone on Jun 16, 2015 8:09:32 GMT
I might have missed it but you don't say what you are building the dome from ? As to the thermolite blocks I think it's easier and more thermally efficient to put them right across your base because you need to encapsulate the oven with insulation. You then build your dome directly onto the insulation layer, then the top insulation layer can meet the underfloor one. One issue you may have is keeping it dry/covered while building as you don't want a wet insulation layer ! I used a cheap 2m x 2m gazebo from eBay which worked well.
Hope this makes sense, good luck and more pictures as you go along please !
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Post by oblertone on Jun 14, 2015 18:42:37 GMT
Looking good so far, now for the fun part !
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Post by oblertone on Jun 5, 2015 8:46:08 GMT
For lack of any other suggestions I'd be looking at what fuel I used as some will leave much more residue than others. Heat is just about the only thing that will shift it, unfortunately closing the door will probably kill the fire.
Is this a new build oven or just new to you ? If it's a completely new build it will not be reaching full operating temperature just yet as it's still drying out.
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Post by oblertone on Jun 5, 2015 8:33:03 GMT
Pardon my ignorance - is the vermicrete instead of insulation blanket and chicken wire? Yes it can be, although some folk use both you can just use vermicrete over your dome, you just need approximately twice the thickness to achieve the same result. Oddly enough loose vermiculite has even better insulation properties but you do need to contain it with walls or some other enclosure. We used 4" of loose over molten zinc and you could put your bare hand on the surface, although it wasn't recommended You can also buy loose vermiculite in garden centres where it is 10 x the price of a builders merchant.
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Post by oblertone on Jun 5, 2015 8:26:19 GMT
I bought a 2m x 2m waterproof gazebo on eBay for about £65 to cover my bare dome while I applied a waterproof finish; unlike a tarp it allowed me space to carry on working while it was raining. Tried to give it away on here when I'd finished but had no takers so it went to the tip.
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Post by oblertone on Jun 1, 2015 16:56:15 GMT
Logic says dry it out before covering otherwise you'll just be locking in the moisture which will eventually have to come out. I used my oven dome for a year before insulating it; not that I'm recommending that but it does illustrate that your excellent work to date could be put to good use i.e. Pizza !
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Post by oblertone on Jun 1, 2015 8:43:09 GMT
Very nice finish on the dome ! I used my oven for a year before insulating it, but a more common route is small fires for a week at least increasing in intensity; some have started the drying process using halogen lighting or even tea lights ! I totally agree that you should dry it out before insulating it as otherwise you're just trapping moisture.
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Post by oblertone on Jun 1, 2015 8:36:42 GMT
You've probably completed the floor by now but a good rule when laying tiles is to do all the complete tiles first, then cut the nadgery bits; it gives you something to work from. Looking good, keep the pics coming.
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Post by oblertone on May 29, 2015 13:10:30 GMT
Great looking build, as to insulation I think the normal course of events is either blanket or vermicrete, but some have done both. It all depends on the room you have available because in general you can't over insulate a WFO.
Most flue systems have a register/anchor plate which uses the same locking mechanism as is used to join lengths together, maybe an enquiry to your supplier ?
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Post by oblertone on May 29, 2015 13:04:16 GMT
Chris (& Hector), bit far from me, but someone closer to Nottingham may have something; I got lucky and paid £50 for mine and wheeled it home.
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Post by oblertone on May 26, 2015 6:30:26 GMT
Is it a home made oven or a pre- cast ? I have a friend considering a similar route so some build details would be welcome.
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Post by oblertone on May 26, 2015 6:27:09 GMT
Great progress; twin wall is expensive if bought new but fire installers often have odd used lengths laying about, or even discontinued styles so it's worth ringing around.
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Post by oblertone on May 17, 2015 18:33:38 GMT
I think you're very lucky to have found such an accommodating yard owner ! The focus should be on finding enough of the same type to complete a dome; say around 70 full bricks for something around 30" internal diameter. As to type, the ones with the holes should defo be avoided, and the least damaged the better. You'll be cutting your bricks in half, so damage at one end is not so bad, you just need more to make up the numbers. I got mine from a skip following demolition of a 200 yr old chimney on the house opposite, work perfectly well given the frequency of use; if you're building for a commercial oven to be used everyday then buy firebricks, if not then get scavenging.
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Post by oblertone on May 14, 2015 10:33:15 GMT
6" internal diameter double skinned stainless (8" external) in 1m length is about perfect for a 36" oven. Ring around local stove installers and seek discontinued or used stock 'cos they just throw it away. I did just that and was given a length with a register (anchor) plate free, had to buy a rain cowl though :-(
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