If you want 4x8 sheets of Hardie soffit, you need the contractors/lumber counter. These will work on 16" layout either direction. The flooring dept will have the 3x5 sheets with squares instead of pretty wood grain. They don't work on any layout. Either way you go I think this is a great idea for fire resistant lining material) Edit-- You can get nippers from the rental counter to cut it without the cloud of concrete dust. they look like a drill with three metal fingers on front. Two remain fixed and the third moves up and down between them cutting a 1/4" path through the material.
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