Steve French
REGISTERED
My second thread today! Hope no one minds...
Anyways, looking at party walls for Part 9 buildings - semi's & townhouses - where a 1-hour FRR assembly is required between the dwelling units in order to subdivide, but the code doesn't appear to make any allowance for drywall application directly to roof trusses that would allow for more than 45-minutes beyond the very last row of the Fire & Sound Resistance Tables where it notes 2 layers 15.9mm Type-X will give a 1-hour rated based on the membrane alone where supporting members are spaced appropriately.
Spoke with a few other folks and everyone seems content to accept 1 layer 5/8" Type-X (one layer each side of the truss obviously) as equivalent to an hour once you roughly factor in the ceiling drywall within the unit (1/2" regular) and the blown-in insulation overtop that. Is this common practice across Canada?
Thanks Folks!
Anyways, looking at party walls for Part 9 buildings - semi's & townhouses - where a 1-hour FRR assembly is required between the dwelling units in order to subdivide, but the code doesn't appear to make any allowance for drywall application directly to roof trusses that would allow for more than 45-minutes beyond the very last row of the Fire & Sound Resistance Tables where it notes 2 layers 15.9mm Type-X will give a 1-hour rated based on the membrane alone where supporting members are spaced appropriately.
Spoke with a few other folks and everyone seems content to accept 1 layer 5/8" Type-X (one layer each side of the truss obviously) as equivalent to an hour once you roughly factor in the ceiling drywall within the unit (1/2" regular) and the blown-in insulation overtop that. Is this common practice across Canada?
Thanks Folks!