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Post by marclappin on Mar 26, 2017 10:49:40 GMT
 Hi Guys I'm currently building my first oven. I ran out of the cement that I have been buying from Vitcas. I thought I better buy enough of the screed to render the oven at the same time and have come to realise just how expensive this is going to be!. Could anybody give me some alternatives? Or do I need to suck it up and get my credit card out. Thanks |
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Post by oblertone on Mar 26, 2017 15:53:30 GMT
Use 'homebrew' for the rest of your build. That is lime/cement/clay/sand in the ratio 1-1-1-3 and once you've finished the dome you can coat the outside with any excess. Fire cement is meant for applications that reach > 1000c, your oven will hit 550 at best.
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Post by marclappin on Mar 26, 2017 16:33:11 GMT
Use 'homebrew' for the rest of your build. That is lime/cement/clay/sand in the ratio 1-1-1-3 and once you've finished the dome you can coat the outside with any excess. Fire cement is meant for applications that reach > 1000c, your oven will hit 550 at best. Thats great thank you, sounds like a plan. Would you be able to tell me in what form to buy the clay and maybe even where to source? Best regards Marc |
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Post by oblertone on Mar 26, 2017 16:54:55 GMT
Apparently most builders yards will stock clay powder; I got mine from a pottery suppliers.
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Post by comuscomp on Apr 4, 2017 12:07:27 GMT
seems like a common builders product in Australia but not in the UK. I got a bag of fireclay off of ebay from Kastree kiln pottery in south wales, there is a place in Chichester, Clayman supplies, who sell powdered clay very cheap but delivery cripples the deal.
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Post by marclappin on May 20, 2017 13:42:21 GMT
  Ok guys, I've finished the dome and covered with fire blanket. Can you render straight on to this or will it just draw the moister and crack everywhere? Thanks, don't want to ruin it at this stage! |
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Post by oblertone on May 21, 2017 9:58:41 GMT
You can render direct but it's better to use something like a chicken wire cage to give the render something to grip. This also helps prevent the blanket becoming too compressed when you apply the render.
Doh, I see from the pictures that you've already done the chicken wire thing !
I also note that you have space for a vermicrete layer before rendering; this will extend the working life of your oven by retaining heat even better. FWIW I rendered (& tiled) directly over 25mm of blanket; my oven will cook pizza all night, then bake bread and a roast the following day, more insulation would have extended this cooking time even further.
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