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Post by james9 on Jun 28, 2017 12:20:36 GMT
Just starting the foundation for a 36' corner Pompeii with adjacent work top. The site's been tricky as its on quite a slope which isn't visible in the photo and I've removed a large skip load of legacy concrete and rough ballast, we then discovered another concrete path underneath the old concrete which has been partially removed.
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Post by Thomobigands on Jul 28, 2017 11:33:31 GMT
Looks good. Have you poured it yet? Why not do away with the divider and cast it as one slab with rebar mesh throughout? Might be stronger. Whats the plan beyond the slab?
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Post by simonh on Jul 28, 2017 12:50:58 GMT
I would cast in one slab too - will be much stronger
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Post by james9 on Aug 20, 2017 20:50:23 GMT
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Post by james9 on Aug 20, 2017 21:00:27 GMT
The base went down about a month ago, cast in two pieces (probably a mistake). The main base was slightly shorter than planned due to the thickness of the shuttering. I used a damp proof liner to cover the bottom and sides because there will be some landscaping after the build, I assumed the weight of concrete would flatten out any folds of the plastic liner but this was wrong so the sides are ok but not perfect. That aside its a good solid base 100-150mm thick & reinforced.
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Post by simonh on Aug 20, 2017 21:39:06 GMT
I am sure it will be fine, if nothing else the weight of the oven will hold it all in place
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Post by james9 on Aug 23, 2017 15:40:17 GMT
Started building up the sides and used a stack of 5 hollow blocks to get an idea of the oven cooking floor height (4 blocks, concrete top, base insulation and fire brick floor), wife said too high so plan B was to stack 3 hollow blocks high and add a solid block. The hollow blocks sizes seem to vary a few mm here and there which is a pain and causes the odd random gap. I filled 9 cores with reinforced concrete. I had this idea to bed the top layer of solid blocks with mortar which worked until we started drilling raw plugs to support the shuttering at which point they moved so not much point. The horizontal shuttering was done using 2 large (1.2x 2.2?) sheets of 18mm ply. I thought this was going to be difficult but brother templated from underneath, and using a circular saw the sheets were cut and in place within 30 mins. The side shuttering was harder to fix and has caused some issues.... Gaffer tape on the corners and any seams worked well. Also used c24m of 12mm rebar on the top but not shown in the photo.
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Post by james9 on Aug 23, 2017 16:02:57 GMT
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Post by james9 on Aug 23, 2017 16:15:10 GMT
The original intention was a 100mm concrete slab followed by wrapped fibre board insulation then the oven. Kiln Linings said that would be sufficient and I wouldn't need insulated blocks or vermicrete on the base.
The slab on the last photo doesn't look too bad but I'm concerned the in-evenness will cause problems later in the build.
What next? do nothing, a self levelling compound, a very liquid concrete layer, a vermicrete layer?
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Post by simonh on Aug 23, 2017 17:43:32 GMT
Looking good, but I would be inclined to put the shuttering back up and do another pour on top to get it level.
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Post by downunderdave on Aug 23, 2017 20:13:20 GMT
The usual method is to make your formwork level and screed the concrete right to the top of the formwork. Whatever underfloor insulation you choose, just make sure the entire oven is encapsulated including under the floor. A dry mix of 50/50 sand and powdered clay makes a good leveller if floor bricks are uneven heights.
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Post by james9 on Oct 17, 2017 13:55:13 GMT
Could someone tell me the difference between bio soluble and ceramic fibre blankets? Also the difference between 96kg and 128kg densities, does the latter offer better heat retention? Was intending to use 50mm thickness Thanks
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Post by downunderdave on Oct 17, 2017 19:59:58 GMT
Could someone tell me the difference between bio soluble and ceramic fibre blankets? Also the difference between 96kg and 128kg densities, does the latter offer better heat retention? Was intending to use 50mm thickness Thanks The new generation (bio soluble CFB ) is exonerated as a class 2 carcinogen (ie has produced tumours in lab rats, but none detected in humans) You can search and download the MSDS for the product and look under toxicology to see if it’s exonerated. The 128 density is a marginally better insulator, but is more expensive. I’ve used both but now always use the 96 as I think it’s better value. They’re both beautiful to cut.
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Post by james9 on Oct 30, 2017 18:33:15 GMT
Dome build phase is starting imminently, templates cut, bricks & insulation have arrived. The site is quite exposed so using a canvas tent for shelter.
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Post by Thomobigands on Oct 30, 2017 22:32:09 GMT
Brilliant! Get some lights in there you could be building round the clock.
Just be sure to remove it before the curing fires!
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