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Post by bookemdanno on Sept 17, 2012 12:40:07 GMT
36" pompeii dome...
To fit blankets? To apply Vermicrete? To final render?
A rough idea in hours please?
thanks!
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Post by faz on Sept 17, 2012 17:09:59 GMT
Based on my experience with a 30", with a bit of time added on!
Blankets - 1 hour (including getting all the chicken wire tightened up) Vermicrete - 1.5 to 2 hours (depending how easy you find it!) Render - roughly an hour for each of the two coats. Really does depend how good at rendering you are and how good a finish you want and could be much longer!
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Post by faz on Sept 17, 2012 19:18:44 GMT
Following on from Terry's comment in another thread - I should point out that you'll need to leave at least 24 hours between the vermicrete and the render, and between each of the two render coats. I think leaving a bit more time after the vermicrete would be useful, possibly even firing the oven up to dry out the layer a bit. There is a lot of water in the vermicrete layer and it is easier to get it out before the render is sitting on top.
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Post by turkey on Sept 18, 2012 8:36:04 GMT
I would say the vermicrete estimation is a little quick there but I did two layers, I found mixing it slow work and had to do it in 3 sessions, the first was to make a wide band round the base which was the vertical section, any higher and for me it collapsed, this dried for a few days (but 24hrs would have been fine) then the second day i covered the rest, this was alot easier with the solid base, the third day was semi quick to apply a whole new coat on, but I think overall it was probably closer to 5 hours work total, with me faffing and the mixing in a bulders bucket rather than the 1ton bag Terry recommends (and I would too based on how slow it was to mix my way).
also I left this to dry for agess (at least a couple of weeks) and it was still not fully dry, the vermicrete itself is like a sponge so it really retains the water, when the cement sets round it if you break a bit off and crush it you can see just how wet it still is internally. i would say you want to try and dry this as much as possible prior to rendering as it will be even harder to dry once that is on.
that said once the vermicrete is on you can start drying fires and get the oven usable, the render will air dry pretty well on its own accord and should not be affected by heavy oven use if you have dried the rest out well.
A highly breathable rain cover will be your best friend, something like a temp roof suspended so air flows under, I could only cover with a tarp and this did not help as when covered it was not drying at all.
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