Fire Durability
For most building elements other than heavy timber, passive fire-resistive level or requirements are in the form of a required fire resistance rating or levels (FRR or FRL). The construction type of a building determines many of the minimum required fire-resistance ratings/levels for different buildings.Mass timber projects often utilise exposed glulam columns and beams. These members are typically considered either part of the building’s primary structural frame or its floor/roof construction, and require fire-resistance ratings/levels. Glulam is also required to have a fire-resistance rating, glulam bending members are unique in that they require core laminations to be substituted for additional tension laminations in order to account for the loss of the lowest lamination(s) due to charring in a fire