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The major difference between a townhouse and a duplex is that a townhouse is considered a single-family attached dwelling, where you own the unit itself and the land it sits on. It was my understanding that each unit should be protected by a firebarrier in the attic. Now we realize that the seller withheld this information. Their entry into the property underneath the door will be slowed by an elevation increase. The answer you received from the seller was not something you should have let slide. on ActiveRain. It looks to have been done from the other side. Nobody had talked to the insurance company yet. A city inspector told my contractor that we need to build a firewall in the attic between the 2 units. For a better experience, please enable JavaScript in your browser before proceeding. The question has been whether the lot line means that the wall at the separation is considered to be an exterior wall that needs to meet the provisions of Section R302.1, resulting in two 1-hour walls at the lot line. If your neighbors smoke, it is very easy for secondhand smoke to make its way into your unit, which can be very frustrating and can result in a reduced quality of living. If the townhouse has fire sprinkler protection, a common 1-hour wall has been acceptable even if there was a lot line between townhouse units. Only 3 days left to register for Inman Connect Las Vegas before prices go up! This type of firewall would be cost-prohibitive to build, especially in residential construction, for residential purposes the firewall isnt really fireproof, its fire-resistant. The door and frame assembly between the dwelling unit and an attached garage shall be labeled by an independent testing agency as having a minimum fire-resistive rating of 20 minutes. A firewall, or an area separation wall, is used where townhomes share a common wall. I believe it increases the burn through time to around 1 hour, and it increases the impact resistance (there's often falling debris in a fire). Any doors that provide access through the firewall should be tightly sealed in order to prevent fumes from seeping into the living areas of the house. IBC 2015, Type VB construction, un-sprinklered. By submitting your email address, you agree to receive marketing emails from Inman. While this requirement is no longer listed in the IRC, it is still a valuable recommendation. Thanks. Another issue related to home safety and firewalls is gas-burning appliances like a water heater located in the garage. All condos are not soundproof. Type X drywall is a thick sheet of interior gypsum board that has glass fibers mixed into the gypsum in order to increase its resistance to fire.