Originally posted by dakzaag
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So the plan now is to frame up a 50x50 form for the insulating layer. It should cover the 36+9 for the width of the oven and the 36+10.5 (6" vent landing + 4.5" brick) for the depth.
Now, I still have a question about what to do with the hearth layer. It's 4", but not completely level (since I planned on bringing the entire hearth level up with insulating concrete, before realizing I can't anchor to it). The form that is still in place IS level.
My options as I see it are:
1. Frame up the insulating form, pour the outside with regular concrete and bring it to level, then remove the form and pour the insulating layer to level inside the new - 2nd layer of concrete? I'm afraid that, if I pour another layer and anchor the wall studs to it, they won't be sufficient to hold the walls in place. This new layer of concrete will be 3.5" thick x 6.5" wide on the sides and 14.5" wide on the front/back.
- If this is all poured in one with some rebar, will it hold the steel studs/hardibacker/stone veneer? I can't see much leveraging force pulling the walls out and down, as the weight should be dispersed DOWN into the slab.
2. Leave as planned, form up and pour the insulating layer (will be completely level), leaving the hearth slightly unlevel. I will have to put some extra work into the metal studs to make sure the roof line is level when the walls go up.
Pictures below to help explain. I'm probably putting more thought and worry into this than necessary.
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