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Post by dirtlover2005 on Jul 14, 2014 21:09:31 GMT
My 'a little careful cutting' didn't go too well! All was fine with the small angle grinder but the big one bit back! - resulted in this -
Hey ho - I was half in a mind it should come down and be rebuilt anyway.
I had been offered some 6" chimney liners through Free cycle which was a bit of a result! With these to hand I was now able to work out how I was going to build the chimney. First the arch went in with a vent twice the size. I then cut a couple of bricks diagonally in half lengthways to create a level base on which to build a small smoke box. This was made from 4 bricks mortared in on their edge. On these I stood the first clay liner and cut 2 bricks cut down to fit around it. I have mortared all this in place. Not sure if that's the right thing to do but it sort of fits with my plans - that of insulating around the chimney and adding additional liners if the draw is not strong enough. To be honest it felt good to get it done as the whole chimney make up was keeping me awake at night pondering it!
I then built the outer arch with the larger heater bricks cut down.
The rebuilt vent
Looking up the chimney..
Outer Arch added...
Tonight I wrapped her in thermal blanket and hope to start getting the devils porridge on over the next few evenings I'm going for about a 10-1 mix is there a simple rule for this ?? Half a bag of cement to a 100ltr bag of vermiculite for example or should I measure by the bucket??
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Post by cobblerdave on Jul 15, 2014 4:15:19 GMT
G'day That's a nice looking piece of brickwork on the front of you oven. I don't think you'll regret that smoke box either, its not just about the smoke stains it losing you fringe that gets to you.
Measure by volume, weather a cup or a bucket, just use the same for all and you will be right.
Again nice looking oven
regards Dave
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Post by mutteringfool on Jul 15, 2014 11:07:27 GMT
That's a really tidy arch, pain having to rebuild but worth it given the chimney design now I think. Did you just use an angle grinder to cut the bricks to fit around the chimney liners? That piece of the build is my next challenge
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Post by dirtlover2005 on Jul 15, 2014 22:31:53 GMT
Yes MF I just used a small angle grinder - took a look at how Rokdok had cut his. I did a lot of straight cuts and snapped out the 'teeth ' then was able to grind / cut a smoother finish
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Post by dirtlover2005 on Jul 16, 2014 13:47:32 GMT
Quick question
I've made a thermal break all around the inner arch and across the floor with slithers Thermalite block. Can I just use homebrew to cover or should I go for a silicone / sealant?
If Silicone or Sealant Vitcas do a 1300c sealant OR a 300c Silicone - which would be the better? I'm thinking silicone for movement but sealant for higher temp.
Thanks
DL
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rokdok
WFO Team Player
Posts: 130
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Post by rokdok on Jul 19, 2014 13:03:55 GMT
Afternoon DL. Your build is looking really good and I think that you will be pleased with the smoke box- should suck out most of the smoke for you. WRT the thermal break I used home-brew to cover the thermalite and there are no signs of any problems with it. I've used the 1300 degs C silicone sealant around the flue again with no probs. I wouldn't use the silicone anywhere where it could get knocked by a poker or a peel. Cheers Paul
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Post by dirtlover2005 on Jul 21, 2014 22:00:44 GMT
Thanks RD - I'll go with the homebrew
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Post by dirtlover2005 on Jul 21, 2014 22:05:21 GMT
Blanket and vermicrete going on
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Post by dirtlover2005 on Jul 21, 2014 22:12:20 GMT
Job done. It wasn't too bad once I had got the hang of the mix. I used a 10:1 mix and found that it went on ok if fairly wet. it does need a good dry out though so have been using a gas burner on really low for a few days and have just moced on to charcoal brickettes after reading Cobbler Dave mention the more even heat distrobution they give.
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Post by cobblerdave on Jul 22, 2014 7:34:33 GMT
G'day Neat job on the CF insulation sometimes it's not the easiest to apply. Now that you have also played with the devils porridge what do you recons the worst? Noticed in another post you had you ingredients together for a render coat. I wouldn't be sealing that v-Crete just yet . I'd be leaving it for a week or two and let the sun and the wind do there job on drying that out. The internal heat will help of course but it will take a while to get through that insulation. Didn't see you mention lime as one of your render mix ingredients? Its important for the render mix as it contributes to the flexibility and resists cracking. I looked at my old notes and the render mix I used was 1 part Portland cement 1 part lime ( hydrated lime ) and 6 parts sand. I've checked it on the web and it seems I used a good mix which they said was suitable floor exterior use and had a good balance of strength and flexibility. I also seen that you are using a coloured orcha in the render. I have seen this done. You put a litre or two of water in the mixer with a teaspoon of dishwashing liquid and the colour Mix well. Add the remaining dry ingredients then balance the water . Myself I chicken out wasn't going to fight SHMBO as she had already picked the texture paint and colour. It proved to be a real bugger to get off when I finally bricked the dome over. I know that its a wait but they say the finish on a handmade piece of furniture should take you as long to complete as its construction Regards dave
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Post by dirtlover2005 on Jul 23, 2014 21:51:47 GMT
Thanks Dave - i have to be honest I prefered applying the v-crete. The blanket was a bit itchy and the chicken wire a pain in the backside! Thanks for the render tips I have Lime so will use the mix you suggest. I bought builders sand and have since seen people using sharp sand - should I change it? I was thinking of rendering the base this weekend and the dome next but I'm now off on a m'bike trip. Its good really otherwise I'd only be sat in the garden watching the oven dry! i'm thinking of trying a pizza before the render goes on. The oven has had 3 days of low gas and a couple of evenings with charcoal with the dome getting to 120c and about 95c at the floor. This has been over the last 2 weeks and the dome was completed a week prior to that. I'm thinking build the temp through the day tomorrow and again on Friday and Sunday night before trying a pizza Monday night - or should I just wait ? ?
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Post by cobblerdave on Jul 24, 2014 21:34:28 GMT
G'day You have been good and patient with the oven drying but to be honest its hard to tell over the internet weather its ready for pizza firing. If you place a piece of plastic sheet on the dome overnight and moisture condenses on the underside of course it's still moist inside the structure..... The calls yours. Your the man on the ground. I would not be using builders sand it has a clay content could lead to cracking? I don't know . I stuck to the tried and true and used the sharp sand. It works and it's proved. The render whilst not easy is still better than V-Crete to handle and the same again leave it to its just setting to get the final finish . To soon and it will just slump. Again hope something here might help Regards dave
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Post by dirtlover2005 on Jul 24, 2014 22:17:07 GMT
Nope I'll just wait a week longer. The weather has been great here so she's drying nicely - don't want to bugger it up now. I'll get the sand changed too - I like tried and tested!!
Many thanks
Andy
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Post by dirtlover2005 on Jul 31, 2014 17:29:33 GMT
Sand duly changed but workibg this weekend so not sure if I'll get chance to render.
Cranked up a fire the other night - nothing too hot but good enough for my boy to make the first loaf - it was bloody lovely the next morning with a bit of butter mmmm
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rokdok
WFO Team Player
Posts: 130
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Post by rokdok on Jul 31, 2014 20:44:10 GMT
Andy, looks beautiful, congratulations. Paul
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