Project is a row of 6 townhomes - 2015 IRC applies.
I'm using Common walls between units with a 2 hour rating. Per R302.2.2 and R302.2.3, the rating is continued tight to the underside of the roof sheathing.
As I read the code, there is therefore no requirement for a parapet extending through the deck.
I see in R302.2.4 where you can eliminate a required parapet by sheathing the underside of the deck in Type X for 4' on either side of the common wall.
What I don't see in the code is language that defines when a parapet is required. R302.2.4 is full of language that defines the rules for parapets when they are required, but what triggers them to be required in the first place.
I'm using Common walls between units with a 2 hour rating. Per R302.2.2 and R302.2.3, the rating is continued tight to the underside of the roof sheathing.
As I read the code, there is therefore no requirement for a parapet extending through the deck.
I see in R302.2.4 where you can eliminate a required parapet by sheathing the underside of the deck in Type X for 4' on either side of the common wall.
What I don't see in the code is language that defines when a parapet is required. R302.2.4 is full of language that defines the rules for parapets when they are required, but what triggers them to be required in the first place.