Re: perlite
I am building a 36in interior dia oven and trying to keep within the forno bravo instructions as much as possible, that's not been as simple as you would think as some of the materials are difficult to come by and can also be quite expensive here in NZ so far I have spent way more than ever intented. Yes I will be using a blanket thank you for your help I will reassess my notes before I progress any further.
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Re: perlite
Originally posted by gaetanin View Postthanks for that, will give it a go and see how I get on. Would you advise just 1 coat or more I have a 100 ltr bag of it so have lots I can use.
4/3 x pi x r x r x r = volume of a sphere. Work out outside volume and subtract inside volume then divide by two because it's a hemisphere. Also add 20% because perlite volume will be reduced on mixing with cement and water.I like to do the layer about an inch and a half thick, then let it dry for a week before adding the next layer and so on. This way you can eliminate the water more easily later.Last edited by david s; 08-02-2013, 10:51 PM.
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Re: perlite
thanks for that, will give it a go and see how I get on. Would you advise just 1 coat or more I have a 100 ltr bag of it so have lots I can use.
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Re: perlite
Sorry, I don't know what C400 is but the ratio for perlcrete over the dome is usually leaner than 5:1. The more cement you put in the brew, the less insulating it will be. I use 10:1 which is enough for it to be still workable.Some folk go even leaner. Also I find a half perlite half vermiculite makes up a more workable mix than either of them alone for some reason. For every 10 parts you will need about 3 parts water.It's thirsty stuff
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