Re: Insulating questions Hi smpomerleau,
I have finished my Pompeii and used one layer of 'Superwool', the equivalent in Australia to what you are using, together with 3 x 1" layers of vermiculite capped with a thin layer of stucco render.
When the oven is 500°C, there is no heat what so ever from the outside of the dome. With the superwool reputely worth the equivalent of 2" of vermiculte, your 3" of insulation would be the equivalent of 6" vermiculitr or with my combination, the 1" wool and an extra layer of vermiculite.
They say that you cannot over insulate your ovens, but you only need enough to hold in the heat inside and within the dome and more will do nothing but cost you. By all means, use your fibreglass bats left over as it can do no harm, but will do nothing if your ceramic blanket is doing it's job properly.
To reduce heat from entering your kitchen (it looks like it is an inside installation), I would most certainly insulate your chimney. It is no different than a slow combustion heater installation but they are installed and used in cold weather to heat the room(s). Your oven would also be used in summer months when the heat radiated from the chimney would make the area unbearable and this would reduce the usefulness of the oven.
Hope this helps you decide and good cooking.
Neill
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