the hardiflex comes in different thicknesses up to 16 mm. if the wall is expected to have some accidental impacts, the framing has to be spaced like what yo do for plywood-stud at every 16 inches on center and use two fireblocks between two studs. in my past experience using hardiflex of 1/4 inch thick and 2"X4"X3/16" rectangular galvanized tubes, it stood to the 200 miles per hour sustained wind and surges but did not suffer damage. i guess it all depends how you build it. if you were to use it as floor, use a ribbed steel backing panel supported by steel joists





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