Posted by Billy NY on January 05, 2011 at 16:08:43 from (74.67.3.54):
In Reply to: Code question for NYs posted by JayinNY on January 05, 2011 at 15:49:01:
The U.L. fire resistance directory back then should have had tested wall types for that application, most of those wood framed chimneys were covered with gypsum wall board sheathing, (multi layers of same?) possibly fire retardant lumber/cold formed metal framing, all to achieve a specific rating, 1 hr, 1hr or maybe a 3hr rating. It would be reasonable to speculate that the NYS code, local code, etc. would allow something U.L. rated for this kind of building occupancy classification, as designed and shown on drawings submitted for building permit approval by whomever the presiding authority was at the time. Architect/Engineer would have to had shown something specific, because the wall type is kind of unique to what it encases, a flue pipe. The other thing is, what was designed, and what was built. These were " value engineering" designs, as they are much quicker to construct and less costly, condo developers, like the Michaels Group, locally, used this design in most of what they built then, as did many home builders.
I would have to speculate that electrical circuits would not be allowed, 1st due to the wall penetrations and other factors, though a shaft/chase/chimney like this would be a great place to hide a riser, if allowed you would think it would have called for steel conduit and encasement. Just some thoughts about it, I could be way off just the same, but my knowledge comes from commercial construction.
U.L. Fire Resistance Directory is a great resource for designers, it provides tested assemblies, thousands of them. More than likely the designer chose a wall type from it.
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