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Horizontal Assemblies that separate exterior/interior spaces
December 6, 2017
1:19 pm
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an architect
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December 6, 2017
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My question is related to horizontal assemblies. I have a situation on a wood framed (type Vb) structure where a 2-hour horizontal assembly is required between  interior space above and exterior space below.  It is a small office building the second floor spans over three parking spaces, open on three sides. Based on a U-group classification (private parking under 1,000sf) , this triggers a 2 hour horizontal separation between the office space above and the parking below.

I am considering using UL Design L577.

My question is this:

Is this assembly rated for exterior/interior exposure?  I have not dealt with this particular condition before, and was hoping to get a flyer from the forum before meeting with the fire marshal.

Also, are densglass type products considered an equivalent substitute fore Firecode C Core?

 

Wishing my overpriced education had touched on some of the nuance of code before graduation right about now.

 

Thanks in advance.