townhouse; roof penetrations at common wall

2009 International Residential Code. got 4 townhouses with common walls between, rated as required. roof is concrete, so no parapets required. but we have landlocked clothes dryers that would want to vent thru the roof. tried to find a minimum clearance to the common wall between townhouse units, but don't see it in the IRC. did i miss it? appreciate any help. thanks!
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