Build, assess, and treat side-by-sides just like detached dwellings, right? Not quite. Explore the opportunities, differences, and complications posed by party walls. How do you interpret a blower door reading when much of the air is coming from the neighbor’s unit? Builders like to use low rise multifamily attic and party walls as convenient distribution locations for ducting, service shafts, and unvented exhaust devices. Resulting problems include condensation, ice damming, and mold.

  

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