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Herein, what does vermiculite do in a fireplace?
Vermiculite insulation is high temperature insulation, suitable for wood burning stoves, gas fires and other boilers to insulate your system, extend it's life, increase it's efficiency and reduce the amount of heat lost through your chimney.
Considering this, how do you mix vermiculite?
1 part by volume) • 23 litres (5 gallons) of water. Pour vermiculite from the bag into mixer, add the correct proportion of Portland cement, mix together and add the water - do not make or use a sloppy mix. The vermiculite concrete can then be placed and lightly tamped into position. Do not compact heavily.
expand vermiculite can not use for Waterproof product. But because the water-absorbing of the vermiculite make it can not be a waterproof thermal insulation product.