I used a product called Arlita. I bought it in Spain and don't know how far it is found but it's used in construction for floors, walls, ceilings, etc. It's an expanded clay ball that's fired and quite light (floats) and was relatively inexpensive.
Just an alternative if you can find it.
I used lots of it over my oven before the final cement layers.
Jim
Just an alternative if you can find it.
I used lots of it over my oven before the final cement layers.
Jim
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