So here is a question as I plan to place a decorative arch on the oven. Is there any concern with using my small stash of remaining f/b refractory mortar to attach my decorative arch directly to the front of the bricks of the outer arch and the adjacent Hardiboard?. I think the lower portion of the decorative arch will be my home made "stone veneer" (made from s-type mortal with colorant poured into forms), the upper part of the arch will be left over pavers that match my patio.
I have a heat break between the inner arch and the dome. I do not have a heat break in the floor. I am not concerned about "loosing heat" to the decorative arch, rather I am wondering if differential expansion of the varied materials with cause them to crack, delaminate etc.
I cut Hardboard slightly larger than the Outer arch (which is "almost" flush with the outer arch). I filled the gap with 500 degree silicon (so the vermiculite does not fly away). I initially thought I would have another gap between the outer and decorative arch, but I am now concerned that I need the extra strength of attachment to the outer arch.
Thoughts?
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