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Re: type of concrete

From the WFO board

Posted by Rado (

In Reply to: type of concrete posted by Bernie

2" (5cm) insulating slab is good. Yes would be good if you made reinforced concrete on top, 4:1:1 (concrete blend of stones and sand : Portland cement : Lime). Rather then placing firebricks right on soft vermiculite. Should be stable and about 3" (7.5cm) thick, also it will be easier to center in reinforcing mesh. This slab absorbs the heat soaking in from the fire making cooking floor not to cool down fast.
I make the hearth slab at 11cm (~4¼") and 2" (5cm) insulation under, where not having slab under the insulation.

Re: type of concrete

by Rado Hand on Google+

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