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Yes that will do fine. Mix it 5 parts vermiculite to one part portland cement and just enough water so that it does not pool in the bottom of your barrow. For every 10 parts vermiculite you need about 3 parts water.Your floor insulation needs to be about 100 mm thick.
The 5:1 vermiculite, cement ratio is correct for the under floor insulation slab. It is strong enough. Sand added will increase strength but reduce insulation value.
If you are building an igloo get your builder to mound your structural slab up slightly in the middle to prevent water penetrating under the vermicrete layer. If building a doghouse it doesn't really matter, you can keep it flat.
is 5 cm (2") ceramic wool enough on the dome? i want to finish dome like igloo. find thing called stucco. can i make stucco with cement, lime and sand, and what ratio? no need to be waterproof becouse the roof over oven.
Two inches of blanket should be plenty. A lot of oven builders cover the blanket with a layer of vermiculite and cement because the creases and folds in the blanket leave an irregular surface. This vermicrete layer also adds additional insulation. One or two inches thick should be enough. If you decide to do this then a 10:1 vermiculite, cement ratio is better because it insulates better with less cement. Allow it to dry for at least week before doing the stucco over it.
Does anyone have an idea how many cubic feet of vermiculite I should have available to cover a Premio2G100 with a 2" layer of vermicrete? I was thinking of using 8:1 but I noticed in the stream 10:1 was used as well.
Thanks for the quick response! I am picking the oven up Monday and want to have all the ducks lined up. I have no experience with vermicrete but lots of experience of calculating bags of concrete needed wrong. Long story but I finally can do that right! Been waiting "patiently" since November to finalize this project. Cannot wait to start cooking. Thanks again!