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Post by dunnes2002 on Jul 10, 2013 12:02:27 GMT
Ok, so Ive been on asking question all over the forum made some mistakes and will update you with my progress....first with the failure. I always planned to do a 120x120cm base but for whatever reason decided to do a smaller one on the day. Heres is the result, too small and not ready to carry the weight required of it..... now demolished, both build and base!!! A new build has started, will upload pics shortly Attachments:
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Post by dunnes2002 on Jul 10, 2013 12:05:48 GMT
A new base put in to the required size of 120cm by 120cm adn with rebar inside to ensure it will hold the weight . Much happier with this result and wont be worried abou tthe weight issues with the first one. I should mention before i post my next image i have never done any building etc previously. All a learning experience for me, with plenty of mistakes along the way. I am enjoying it though!!! Attachments:
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Post by dunnes2002 on Jul 10, 2013 12:09:20 GMT
as i say never dont bricklaying at all..... this was done over the weekend while i had access to a cement mixer, the heat was a killer!! Some of the brickwork is questionable but it looks sturdy and the middle column is quite thick which will take most of the weight. I was even more impressed with the fact it was level at the end!! (it wasnt half way up!!) Attachments:
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petec
WFO Team Player
Posts: 232
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Post by petec on Jul 10, 2013 19:09:45 GMT
Cool !
great to see another build in Leeds !
keep the photos coming.
Cheers
PeteC
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Post by dunnes2002 on Jul 10, 2013 20:52:02 GMT
Just had the time signed off to start the next stage. Got quite a young family and a family wedding coming up so free time is rare at the minute.
You might be able to tell I'm trying to keep my build as cheap as possible, all bricks so far have been from gumtree etc and have cost £20 so far. The dome will be built with these solid old clay bricks, plenty left.
Unfortunately i'll have to spend some money on the next stage, going to stand celcon blocks on their side for the floor insulation and surround with a brick retaining wall.
Thanks Pete, I have has a look at your build and many others to get the finer details clear in my mind.
Whereabouts in Leeds are you? A guy I got some bricks from in moortown said his friend had recently built one, lee was his name
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Post by cannyfradock on Jul 11, 2013 8:51:37 GMT
Dunnes
Great progress on "plan B". A couple of concerns.......are the 3 supporting walls standing alone or are they tied into each other?.....(excuse my ignorance if they are)....if not you need to do this.
"Unfortunately i'll have to spend some money on the next stage, going to stand celcon blocks on their side for the floor insulation" .....If you stand the blocks on their side (9") your hearth will be too high. You only need to lay them flat (4")......or did I misread that.
Try to find/beg/steal/borrow some fire-bricks for your hearth. If you can't get standard fire-bricks, very often small lots of storage heater fire-bricks come up on e-bay.
Terry
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Post by dunnes2002 on Jul 11, 2013 11:24:55 GMT
Thanks for your concerns,
the three walls are joined at the back, really just 1 wall surround with a middle block all joined together.
With the blocks i thought they would give better insulation and protect the paving more if they were laid on their side, i had also built this into my design leaving the current build fairly low. If this is not that case id quite happily leave them flat and save more money!!!
I think i read somewhere that the heath should be faily high so that you sont have to bend down, im 6"3 so was planning to build it upto about 5ft high or so for comfort.
Im ok with spending money on the important bits like insulation/fire bricks etc just wanted the support etc to be as cheap as possible!! but i will still keep a look out on ebay.
Im even that cheap im going to drive to kilnlinings to avoid the delivery cost, dont need too much though just fire bricks and a peel
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Post by dunnes2002 on Jul 11, 2013 11:37:32 GMT
Had 5 minutes spare last night so i popped out to see what size the oven will be, looks like a maximum of 30" may take it down to 29" to make sure it fits ok. The opening will be 13.5" as the oven peel i will get is 12". So from things ive been reading a dome height of 15" and a door height of 9.5"... i hope thats correct! Dont worry, ill be using half bricks with good edges on the actual build, i picked up the cliosest bricks to me for the measurements. Although using a full brick probably gives a good guide once the insulation is added to the space required (will be doing a vermicrete layer and a weatherproofing layer as its a pizza oven only) Attachments:
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Post by cannyfradock on Jul 11, 2013 17:13:17 GMT
Dunnes
I always say the minimum diameter of an oven should be no less than 2 foot, so you should have lots of fun with your 2' 6" oven.
The recommended height of the hearth is elbow height of the person using the oven...or thereabouts.
Your calcs sound good but I made my first oven opening 13 1/2" thinking exactly the same as you.....12" peel. I found that size too small so .....if it's not too late you can push the opening to a max of 16" for that size oven.
All the best with your next stage....
Terry
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Post by dunnes2002 on Jul 11, 2013 17:23:42 GMT
Terry thanks again I'm feeling a lot more confident going into my build. Could you confirm whether the calcon bricks are ok just laid on top of the slabs instead of being put on their sides?
I see Petec's build is very similar so preferring this method at the minute
I will increase the opening too, sounds very sensible.
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Post by cannyfradock on Jul 11, 2013 19:15:52 GMT
Dunnes
I'll tell you what I know. I first saw the use of insulation blocks as a thermal layer under the hearth on the American FB forum. I'm not sure if it was our old forum or the FB forum, but someone done a test with a flamed blowtorch for something like 30 minutes directly on the side of one of these insulation blocks. After 30 minutes the insulation block was not damaged and no heat had transmitted to the underside of the block. I have built about 6...or 8? ovens using this method and so far haven't had any problems with the performance.
I lay the insulation blocks flat (4") with normal render, but lay the fire-brick hearth on top of these with the homebrew mix of sand, cement, hydrated lime and powdred fire-clay at a ratio of 6:1:1:1.....the recommended ratio is 4:1:1:1 but I think that unless a very coarse sand is used (the type used in screed with shells and small aggregate in it), then 6:1:1:1 is probably stronger.
Terry
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Post by dunnes2002 on Jul 11, 2013 21:38:00 GMT
Once again thanks fir the advice, probably saved me £40 by laying them flat. Should be able to get the insulation down next week.
Now to find some fire clay looks like kilnlinings has run out
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Post by cannyfradock on Jul 11, 2013 22:47:07 GMT
....any of your mates passing S.Wales......I have a bag of fire-clay (powdered fire-clay) left over from my current build.
Terry
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Post by dunnes2002 on Jul 12, 2013 6:57:48 GMT
thanks for the offer, funnily enough i have quite a few friends coming up from cardiff for a family wedding but im sure kilnlinings will have some in stock soon.
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Post by dunnes2002 on Jul 20, 2013 20:53:04 GMT
Finally managed to get out and get the insulation down. Thermalite blocks seem very fragile and a lot of the edges seem to fall off once they had been put in place with a few taps of the rubber mallet. Created a little extra floor space by overhanging the blocks by 1.5" should be fine as will just help with the render and vermi layer. Going to collect the fire bricks on Friday, enjoy a family wedding all weekend and then get serious on the dome. Think I'm going to use a form to get it done quickly. Probably mdf or polystyrene haven't decided yet. Not sure on the insulation yet either may go with a 1.5" layer of ceramic fire blanket and 3" vermi and 1" mortar. Don't ask about the chimney... Haven't thought about that yet!!!!! Attachments:
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