leeb
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Posts: 74
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Post by leeb on Apr 26, 2012 16:12:20 GMT
Planning to build a 60cm Internal 110cm external WBO, and probably a counter on the left with cupboards etc. Will it be ok having two fences behind ? Attachments:
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cec
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Post by cec on Apr 26, 2012 20:11:06 GMT
Could you not fit a bit bigger 1 in , Iv done mine 30" internal which I thing is 90 cm and I think it could do to be bigger but I had to fit it in to what I had , Mine doesn't look that big inside , when I did he form it looked huge but know its built it's small . I would of thought the fence behind would be fine ,
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Post by tonyb on Apr 26, 2012 22:08:54 GMT
Provided you have plenty of insulation then shouldn't be a problem. The outside of my wfo barely gets warm when firing/cooking, there are pictures somewhere on the old site of cooking pizza and a couple of inches of snow on the top of the oven. The snow did eventually melt though, maybe I should have used more insulation A bigger problem might be with overhanging branches from those adjacent trees, flue gas temperature is very hot!
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leeb
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Posts: 74
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Post by leeb on Apr 27, 2012 11:52:52 GMT
Can somebody please recommend a good mix and tell me which depth I should make my concrete slab for a 60cm internal WFO ? Many thanks lee ( I did say its my first ever build )
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leeb
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Posts: 74
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Post by leeb on Apr 30, 2012 20:47:55 GMT
finally got some decent weather so made a start, dug, made a frame and compacted some type 1 and stones Attachments:
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leeb
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Posts: 74
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Post by leeb on Apr 30, 2012 20:48:44 GMT
in goes the sand Attachments:
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leeb
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Posts: 74
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Post by leeb on Apr 30, 2012 20:49:31 GMT
then added a DPC and rebar Attachments:
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leeb
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Posts: 74
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Post by leeb on Apr 30, 2012 20:56:06 GMT
then finished off the day with a 1:3 cement ballast mix. Used a mixer and pretty glad i did, alot of bags needed to make 13cm slab.Had to pop to B&Q to buy some more cement and ballast half way through as my calculations were off the mark. The cat try to put her paw in the finished concrete twice so had to then spend an hour covering it all. Hopefully there won't be any footprints in the morning Attachments:
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Post by cannyfradock on Apr 30, 2012 22:18:52 GMT
Hello leeb....welcome to the forum.
Your build is off to a flying start. Good idea on the dpc membrane. The more you can keep the damp out....the better. If you lay a dpc below.....and on top of your supporting walls, this will also help a great deal.
As mentioned your dome will be fine with the fence. You could also put a spark diffuser/cowl on your chimney for extra piece of mind.
Terry
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Post by turkey on May 1, 2012 8:05:24 GMT
I think the qty required of cement and balast goes wrong for everyone, I try to not build anything now when I know wickes local to me will be shut ;-)
the dpc is a great idea that I should have done, but the slab seems ok as it is, but probably wicking more water than I realise...
your base looks a very pro build and hopefully people follow your lead here,as its all built on top of that.
what are the dimensions you went for in the end for the base and the planned oven?
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tapir
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Post by tapir on May 1, 2012 8:31:05 GMT
Hi Leeb, nice start to your project. I can echo yours and Turkey's concrete calculation fun - when I poured my base and upper slab, I had to keep nipping down to Wickes, B&Q etc for more ballast. oh, and you should have left the cat paw print on there
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leeb
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Posts: 74
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Post by leeb on May 1, 2012 8:50:29 GMT
thanks Terry and Turkey, yeah I was going to put DPC under the bricks as well as I've still got loads left. I built my base 1200 in the end so I will probably build a bigger oven maybe 900 internal (but don't tell the Mrs). Today the rain is back so I'm going to try and make a template and work out roughly how many bricks. Kiln linings reckon about 200-230 for a 1mtr oven. Does that sound right ?
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Post by cannyfradock on May 1, 2012 10:25:43 GMT
Leeb
I don't know if I do things different to other as many members have quoted between 180 and 220 bricks for an oven. I am 99% sure that I ordered 130 fire-bricks and 5 x 1" fire bricks for my build.(for the dome/arch transition).....even then I had a few bricks left over.
My build was a 90cm internal diameter Pompeii with half bricks used for the dome (laid flat so the wall is 4 1/2" deep.) The floor was laid flat....and inside the dome wall (3") and just the internal arch was fire-brick. The entrance arch was clay bricks. As a note .....I didn't put a fire-stop between internal fire-brick arch and clay brick arch entrance......this caused some cracking on the outside where the 2 bricks met.
As I said...others disagree with the number of bricks needed...healthy disagreement is welcome.
Terry
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Post by tonyb on May 1, 2012 11:57:23 GMT
200 bricks, no wastage for my 42" internal wfo with firebrick floor and 3 course firebrick chimney.
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Post by turkey on May 1, 2012 16:41:40 GMT
when calculating bricks there are a few things to think about, the first if the floor. I and I suspect most here laid them fat side up, so the floor is only 2" thick, I think on FB people lay them thin side up (not vertical) so probably use 2 * the qty for the floor, but also have a lot more thermal mass. This is good for commerical long term heat retention but in the garden is overkill, it takes linger to heat and thus more wood.
Second as tony mentioned is the enterance and chimney, these I suspect take far fewer than you initially might suspect for modest ovens.
will you make a solider course? as this does not affect the closure of the top of the oven so is extra bricks unless you cut them to an angle, even then I think they add to an adition as you use them whole normally.
I think my base is close to 1200 square (sic) and I have 140~ bricks and feel I will manage. If you check my build you can see my slow progress, the internal diameter is 31" ish and as I have not rendered the outside of the bricks they are easier to count.
doccrow on the old forum did a 36" with 160 bricks, but no chimney in that. I am sure many other post their numbers, and most are frugal with re-using offcuts, I have quite a few "broken" bits all cemented in as blalst in non supporting areas round the arch transition. so Far I have used 70 odd maybe and have only wasted say 2 in total ? I managed to make all the bits count.
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