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I`m building a outdoor fire place, pizza oven, and grill smoker combo . All separate units . My problem is on the fireplace top I will have a large chimney over the whole back ,but I wanted to have a flat surface instead of a arch in front . the size is 4ft. by 2 .and a half ft. wide . This would be the open space with block and brick on the sides . I would like to pour a concrete slab in this space . . As regular concrete would not hold up to the heat I was thinking of using a vermiculite concrete base maybe over concrete board [ would`nt care if the board deteriorated after from heat ] pour this about 3 inches thick . Then for structure pour a top coat of high strength concrete over this with re-bar reinforcing . I will also have steel angle the long way under the form .
Any thoughts as to weather the vermiculite concrete would hold up in this application . I could go with steel sheet 1/4 inch but the heat would still transfer thru and crack regular concrete I think .. Any suggestions would be welcome . I do not have access to vermiculite board or calcium silicate board .. That might have solved the problem ..
Any thoughts as to weather the vermiculite concrete would hold up in this application . I could go with steel sheet 1/4 inch but the heat would still transfer thru and crack regular concrete I think .. Any suggestions would be welcome . I do not have access to vermiculite board or calcium silicate board .. That might have solved the problem ..