Francis Vineyard
REGISTERED
Starting in 2006 IRC made clarification that the filling the opening around the penetrating item such as PVC be protected with approved material to resist the free passage of flame.
It seems wood is more forgiving when impacted and has a tendency to shear whereas metal columns bolted to the structure will tear or pull the beam if the bolt doesn't shear.
For an alternative I believe the IBC has heavy timber and laminated 8x8 min. columns as 1 hour rated; otherwise all others need ½ gypsum cover.
Francis
It seems wood is more forgiving when impacted and has a tendency to shear whereas metal columns bolted to the structure will tear or pull the beam if the bolt doesn't shear.
For an alternative I believe the IBC has heavy timber and laminated 8x8 min. columns as 1 hour rated; otherwise all others need ½ gypsum cover.
Francis