indyarchyguy
SAWHORSE
We have an existing building. Existing Type II-B Construction. Part of the work is replacing the roof system (see attached details). The existing building still has existing wood nailers and fascia that were left in place as they are not rotted, etc.
Per Table 601, Type II-B construction, the table indicates for "Roof Construction and Associated Secondary Members" the fire rating is 0-hours. The definition of Secondary Members per Section 202 is as follows:
"SECONDARY MEMBERS. The following structural members shall be considered secondary members and not part of the primary structural frame:
2015 IBC Code and Commentary
Section 603 - Combustible Material in Type I and II Construction
Buildings of Type I and II construction are considered noncombustible structures. as such, all of the building elements, including walls, floors, and roofs, are to be constructed of noncombustible materials. There are, however, a variety of exceptions to the general rule that allow a limited amount of combustibles to be used in the building's construction.
Roofs constructed of FRT wood are also acceptable in most buildings. This would include roof girders, trusses, beams, joists, or decking, as well as blocking, nailers, or similar components that may be a part of the roof system.
The allowances in Section 603.1, Item 1.3, do not reduce any required level of fire resistance for wall or roof construction as established by Table 601. Rather, they simply allow the use of FRT wood in the locations listed where noncombustible construction is otherwise required.
As Table 601 provides for a 0-hour rating, what am I missing here? The code allows for secondary members to not be rated and yet, the inspector is requiring FRT based on a code and commentary. Is this a known bust between the actual code and the code/commentary book? Thank you.
Per Table 601, Type II-B construction, the table indicates for "Roof Construction and Associated Secondary Members" the fire rating is 0-hours. The definition of Secondary Members per Section 202 is as follows:
"SECONDARY MEMBERS. The following structural members shall be considered secondary members and not part of the primary structural frame:
- Structural members not having direct connections to the columns.
- Members of the floor construction and roof construction not having direct connections to the columns.
- Bracing members other than those that are part of the primary structural frame."
2015 IBC Code and Commentary
Section 603 - Combustible Material in Type I and II Construction
Buildings of Type I and II construction are considered noncombustible structures. as such, all of the building elements, including walls, floors, and roofs, are to be constructed of noncombustible materials. There are, however, a variety of exceptions to the general rule that allow a limited amount of combustibles to be used in the building's construction.
Roofs constructed of FRT wood are also acceptable in most buildings. This would include roof girders, trusses, beams, joists, or decking, as well as blocking, nailers, or similar components that may be a part of the roof system.
The allowances in Section 603.1, Item 1.3, do not reduce any required level of fire resistance for wall or roof construction as established by Table 601. Rather, they simply allow the use of FRT wood in the locations listed where noncombustible construction is otherwise required.
As Table 601 provides for a 0-hour rating, what am I missing here? The code allows for secondary members to not be rated and yet, the inspector is requiring FRT based on a code and commentary. Is this a known bust between the actual code and the code/commentary book? Thank you.
