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Post by cannyfradock on May 1, 2012 18:36:20 GMT
Leeb
Hopefully you can the be member advising "how many bricks" to the same question 6 months down the line. I would definately over order the amount you need. You don't want to pay that delivery charge twice. If you have any refractory materials left over, you can always post them on our buy and sell section.......or e-bay. They will always be "snapped up" when on sale.
Please keep posting if any other members have more to add.
Terry
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tapir
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Post by tapir on May 1, 2012 18:58:35 GMT
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 ? Hi Leeb. I used google sketch up to help decide how many bricks I needed, by making a mock up of my oven. I made individual bricks with the correct dimensions, and from that made a pretty good estimate. You can get it here for free. Consider ordering extra for contingency; I found that some of the bricks are not uniform in shape, and when building my BVO, some of them just didn't fit properly (they would have been fine, I'm just a pedant). There were also some that I slapped the fire cement on only to find that it was on the side that would be on show, and doesn't wipe off that well (did I mention I'm a pedant?) You will need to cut some odd shapes, sods law says that the off cuts you have left are not large enough for the 3 remaining bits you need I think I ordered an extra 20 bricks, so whilst it bumped the cost up, in the grand scheme of things it's cheaper than paying for a second delivery. Keep the spares in good condition and sell/swap them when you're done
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leeb
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Post by leeb on May 2, 2012 13:46:58 GMT
I've brought 30 thermalite blocks the hollow (number 8 shaped) they are massive, is this not overkill ? can't I just use normal thermalite I'm going to render whatever i use and these blocks leave me with not alot of storage space underneath the oven
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Post by turkey on May 2, 2012 14:20:30 GMT
I used normal concrete blocks and rendered with brick, Terry said regular thermalite blocks have the same compressive strength so I believe you can use these, after all they do suppose most of the roof in regular house contruction.
I would get confirmation from Terry on that, but it would make life a lot easier to use the lighter blocks, they come in various thicknesses so you can get stubby blocks for peace of mind.
Perhaps lay some out to see how much space the do take, the space under the oven is like a tardis on mine, it would cost a pretty penny to fill with wood.
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Post by pete123 on May 2, 2012 21:27:17 GMT
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leeb
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Post by leeb on May 2, 2012 22:38:49 GMT
Stuck with the 7 newton hollow blocks in the end, just finished (me and the mrs burning the midnight oil)laying the base.But even with lights too dark to photograph. Will snap a shot in the morning. Attachments:
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leeb
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Post by leeb on May 2, 2012 22:45:20 GMT
Ordered 180 fire bricks and thermal blankets, boards etc. from Kiln linings today spoke to Liam and he seems a top bloke and was very helpfull so praying the weather gets better so I can crack on
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leeb
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Post by leeb on May 3, 2012 10:03:17 GMT
Does anyone know if there is a way of working out the internal height of the dome, for example a 100cm internal oven will have Xcm and a 90cm will have Y height. I'm just wondering if there is an equasion or a table ? Trying to calculate my doorway
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Post by cannyfradock on May 3, 2012 19:31:43 GMT
I'll try to answer this..
In school trying to understand pi r2 and "simple equations seemed foreign to me. In fact they play a major part in the real world when calculating arch measurements and working out quantities when you only have a part of a mathmatical puzzle.
Pi relates to anything that is....or part of a perfect circle. When creating an arch, you might want a high arch or a shallow arch, but as long as the pitch of the arch is part of a perfect circle.....it will function in it's own purpose.....it will take it's own weight and become stronger the more mass is laid upon it as long as it is buttressed either side to take the diagonal stress of how an arch performs.
In relation to a dome.....if the diameter is 90cm, then the height of the dome should be 45cm ...when working with a perfect circle. The height of the internal arch is 63% of the internal height of the dome. The calculation for the underside of the internal arch will be 63% of 90 = 56.70cm.
The equation for this is......
diameter = x domeheight = y (x ÷ 2) internal arch height = z (y x .63
Oh dear....I'm not sure if that's right.....but think so
Thinking more.....ow that hurts.....Typical question...
Find the height of the internal arch if your oven id 120cm in diameter.......
given.....x =120cm
the value of x =120
= (x ÷ y) x .63 = z
z = 37.8cm
Oh bugger...I'm totally confused now!
Terry
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leeb
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Post by leeb on May 3, 2012 22:14:13 GMT
Thanks terry, sorry for a 90 diameter dome should that have read 63% of 45cm not 90cm if its diameter divided by two ?
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cec
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Post by cec on May 4, 2012 4:39:06 GMT
Yeah
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Post by cannyfradock on May 4, 2012 7:17:42 GMT
Thank-you cec.....told you I was confused.
I'll try to write that equation out correctly....unless some one beats me to it.
Terry
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leeb
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Posts: 74
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Post by leeb on May 4, 2012 11:27:14 GMT
Ok base up, really annoyed with myself as I was concentrating on my bricklaying so much I forgot to put in a DPC Going to put one under the top slab and I have one in the bottom slab so hopefully that will do. Put a sleeper in and stepped out the brickwork at the back to give me more space for a bigger oven. Bricks coming today so I'd better get cracking with the top slab Attachments:
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leeb
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Post by leeb on May 4, 2012 11:43:19 GMT
I forgot to ask is it possible to render over the edge of the concrete slab if so do you need to paint a bonding on it or will the render take straight to it ?
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Post by turkey on May 4, 2012 14:19:11 GMT
I would assume it will render fine, it will be quite rough due to the wood form I suspect, if not a quick attack with an angle grinder will make a suitable surface to key against.
So the hight of the oven is its radius, which is half its diameter. You then take this and want to make the inner arch 63%.Luckily anything really wrong will look wrong and be easy to see ahead of time I think.
easy to say, in the "heat" of building its easy to forget or just totally get wrong lol (check my build thread )
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