Mix Vermiculite and Perlite?
I'm close to pouring my insulating layer under the hearth and have just realized I need another bag of vermiculite. I was going to get another 100 litre bag but I've just discovered that perlite is mined not far from here and is much cheaper. If I buy a 100 litre bag of perlite can I mix it with the vermiculite? Will the combination make a strong enough base for the oven to sit on and if I do get the perlite, should I get medium or course grain?
Thanks for your help.
Re: Mix Vermiculite and Perlite?
Yes. You can mix them. I find that the perlite added to the vermiculite actually aids in placement and workability.
Try to get the coarse grain.
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