Attic Firewall In Multi Family Building

The firewall should extend into the attic separating your attic space from the attic above the neighboring units.

Attic firewall in multi family building.

Construction types v a and v b in the international building code by sean o hara. Parapets an ancient feature of forts to repel attacks were extended above the roof surface on top of the fire wall to enhance its effectiveness. In addition with duplexes you do not need a 4ft flare in the attic or a parapet wall above the roof. Fire wall multi family the old way treated the two dwellings within the two family dwelling as separate structures i e similar to townhouses which are separate structures in that the fire partition had to extend to the roof etc the new way treats them as two dwellings in a multi dwelling single structure i e similar to condos.

The intent of this brief is to provide code specific information about air sealing and insulating common walls in multi family buildings to help ensure that the measures will be accepted as being in compliance with the code. Fire walls became a line of defense. If there is a firewall in your attic the fire rating should be printed on the. The requirementthata firewall cannotcollapse during fire conditions isalso documented in stisection706 2 of the 2012 ibc.

So basically a firewall creates separate independent buildings. Air sealing and insulating common walls party walls in multi family buildings code compliance brief overview. Fire resistance rating not less than 1 hour exceptions. Floor plan for a small house 1 150 sf with 3 bedrooms and 2 baths by sean o hara.

O corridor walls may be hour per table 1020 1 o dwelling and sleeping unit. 2015 ibc multi family 3 09 12 2017 fire partitions ibc 708 3.