Keystone
SAWHORSE
Townshouse developement, side by side units.
Lumber supplier shipped out unrated ply for the 4ft fire separation and OSB for interior roof in fill.
It involves a National Production Bldr. so they have 3 six pack units built and shingled.
Bldr wants to apply No-Burn or similar product to underside of roof sheathing as a remedy.
My opinion is a hard NO, the rating from sheathing is from both sides, top and underside.
Fire rated spray from the underside only protects just that, the underside.
We would still have a minimal unprotected narrow section of sheathing between party walls and no protection form the top side.
I believe the bldr is now speaking with its numerous Licensed D.P.’s...
Thoughts, Opinions?
Lumber supplier shipped out unrated ply for the 4ft fire separation and OSB for interior roof in fill.
It involves a National Production Bldr. so they have 3 six pack units built and shingled.
Bldr wants to apply No-Burn or similar product to underside of roof sheathing as a remedy.
My opinion is a hard NO, the rating from sheathing is from both sides, top and underside.
Fire rated spray from the underside only protects just that, the underside.
We would still have a minimal unprotected narrow section of sheathing between party walls and no protection form the top side.
I believe the bldr is now speaking with its numerous Licensed D.P.’s...
Thoughts, Opinions?