How To Achieve 1 Hour Fire Rated Wood Roof Trusses

Substrate roof floor ceiling time assembly ff file no.

How to achieve 1 hour fire rated wood roof trusses.

There is a truss directly above the firewall. See full report for details. 12 x 24 2 x 4 8 w10 x 25 beam floor units and beam support 3 hr. Gypsum wallboard roof ceilings wood framing pitched roof truss 11 1 hr.

Chapter 3 of ansi tpi 1 stipulates that lumber treated with fire retardant chemicals must be identified and clearly marked by the manufacturer. Assemblies include ducts dampers lighting or other fixtures in the tested assembly. Ibc table 721 3 item 21 1 1 describes a single prescriptive 1 hour rated floor or roof assembly that includes wood trusses. Fire rated suspended ceiling wood truss council of america floor or roof fire notes 1.

3 4 fr 83 12 x 12 z runners fluorescent type none 2 1 2 concrete. And 12 of r 38 fiberglass batt insulation. Type x gypsum board is wallboard to which non combustible fibers have been added. Any help is appreciated.

Ul u338 figure 17 3 3. According to the book commercial drafting and detailing a typical one hour fire rated wall consists of 2x4 studs spaced 16 inches from the center of one stud to the center of the next covered by 5 8 inch type x gypsum board. By code i need a minimum 1 2 hour rating. With 1 2 wood structural panels with exterior glue applied at right angles to top of joist or top chord of trusses.

Screw fastened perpendicular to lower chord of wood trusses of 2 x 4 38 mm x 89 mm. How do i get a 1 hour fire rating for the truss. 276 fire rated ceiling assemblies suspension ceiling designs floor ceiling designs a003 3 hr. 2x4 studs spaced 24 o c.

Applied to bottom chord of each truss floor or roof 1 hour. I need help to determine the fire rating of a ceiling unfinished attic space above with 1 2 gyp board with attached to wood trusses 24 o c. 1 hour rated wall bearing or non bearing with optional insulation with a finish rating of 20 minutes for 1 layer of gypsum each side for non bearing walls or 59 minutes with 2 layers of gypsum each side for bearing walls on a single gable truss with 2x3 o c. Wood joists wood i joists floor trusses and flat or pitched roof trusses spaced a maximum 24 o c.

Concrete with cellular steel 3 hr. Urb concealed grid system and tile. Requirements related to fire retardant materials specific to trusses are located in ansi tpi 1 design standard for the manufacture of metal plate connected wood trusses. I believe adding 5 8 drywall on both sides is the answer but i don t have a design rating number or detail for it.