I want to put a perlite top over 4" of 1" CF blanket....I don't need it for insulation. I'd like to fashion it in a tall hip roof configuration,think French ranch house. To be covered with approx. 1-2" of stucco type mortar and possibly using a cobble design roller or stamp. There is 9 courses of brick surrounding the oven with 2 1/2" of loose vermiculite between the oven and the 4" CF layer. Just about 10" sticks out above the surrounding wall...this will be where the perlcrete will be used. Can lime be used with the perlcrete? What type cement will give me a harder perlcrete? Repeating......not using the perlcrete for insulation.....The pictures don't show it ,but, there are 9 courses of brick surrounding the oven... The box around the oven is complete, just need the top....and the archway floor...p.s. the oven cleared in a hour with a armfull of white oak...kept it there for an additional hour,cooked pork roast, squash and potatoes, shut UN insulated door....30 hrs. later, still in the 300's..............whooohoooo.
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How strong can you make perlite?