I’m sheathing in the exterior wall of the house. To make the fire insurance people happy I used steel studs in the 5′ wide opening behind where the approved wood stove will go. The chimney is to be brick with a SS liner. On the interior wall I’ll use cement board and a masonry face. The cavity will be packed with fire-rated insulation. Can/should I use cement board on the outside of the wall in place of the OSB to keep that whole section of the exterior wall fire resistant? If so, should the cement board extend to the adjacent wood studs? If not, should the OSB extend to the first steel stud to tie the wall together? The wall structure in this area has been okayed by the truss supplier as the steel studs are non-load bearing, but no mention was made of sheathing. This is in Eastern Canada.
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2thumbs, the best advise is to check the installation manual for your fpl, I'm assuming its a wood burning zero clearance cause of the ss chimney. The inspector and insurance co. will want a copy of this to ensure it was installed to the unit makers spec's, you can do a lot of common sense stuff for extra insurance etc, but that really doesn't matter if you miss a spec'd detail.
depends on your shear wall requirements for seismic and wind loading on that wall.
I don't understand why you don't do this all in brick since you are having a mason for the chimney itself anyways. All this is an un-necessary complication.
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