IABO Code Talk

 
 
If townhouse units are separated by lot lines, is a single common one-hour wall sufficient at the lot line or are two one-hour walls required?
 


Comments

Steve
04/15/2010 16:00

My opinion: 1 hr common wall meets the 2009 IRC. "R302.2 Townhouses.Exception: A common 1-hour fire-resistance-rated wall assembly … is permitted …"

I think the exception means that you do not go to R302.1 or fire separation distance. It’s just a one-hour common wall. I know others require two 1-hr. walls based on fire separation distance to lot line (the same as is done with a two-family dwelling separated by a lot line).

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