Hi Paul
I have sourced water proof calsil for my new build. Have tested Calsil from my first build and it just soaks up water like a sponge, this new stuff does not absorb moisture or water at all.
Also if you check my first build i sealed around the outer shell to the edge of base and never had an issue with water getting into oven. I also made a door for the outer arch so rain could not get in.
You could also put a thin screeded layer of fine sand the bricks will bed in like pavers and should then be level.
I have sourced water proof calsil for my new build. Have tested Calsil from my first build and it just soaks up water like a sponge, this new stuff does not absorb moisture or water at all.
Also if you check my first build i sealed around the outer shell to the edge of base and never had an issue with water getting into oven. I also made a door for the outer arch so rain could not get in.
You could also put a thin screeded layer of fine sand the bricks will bed in like pavers and should then be level.
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