How To Achieve 1 Hour Fire Rated Wood Roof Trusses

12 x 24 2 x 4 8 w10 x 25 beam floor units and beam support 3 hr.

How to achieve 1 hour fire rated wood roof trusses.

And 12 of r 38 fiberglass batt insulation. Gypsum wallboard roof ceilings wood framing pitched roof truss 11 1 hr. With 1 2 wood structural panels with exterior glue applied at right angles to top of joist or top chord of trusses. 2x4 studs spaced 24 o c.

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. Ul u338 figure 17 3 3. Concrete with cellular steel 3 hr. Assemblies include ducts dampers lighting or other fixtures in the tested assembly.

2 x 8 f d joists 16 o c 1 layer 3 4 bead board ceiling span 17 18 live load 40 lbs. Chapter 3 of ansi tpi 1 stipulates that lumber treated with fire retardant chemicals must be identified and clearly marked by the manufacturer. Applied to bottom chord of each truss floor or roof 1 hour. 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.

Screw fastened perpendicular to lower chord of wood trusses of 2 x 4 38 mm x 89 mm. 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. Type x gypsum board is wallboard to which non combustible fibers have been added. Substrate roof floor ceiling time assembly ff file no.

Ul p533 roof ceiling one layer 5 8 15 9 mm fire shield c ga rc 2603 wallboard attached to 1 2 12 7 mm resilient furring channel spaced 12 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. How do i get a 1 hour fire rating for the truss. There is a truss directly above the firewall.

276 fire rated ceiling assemblies suspension ceiling designs floor ceiling designs a003 3 hr. See full report for details. Urb concealed grid system and tile. I have a 1 hour firewall for both directions.

Ibc table 721 3 item 21 1 1 describes a single prescriptive 1 hour rated floor or roof assembly that includes wood trusses. Any help is appreciated. 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. Fire rated suspended ceiling wood truss council of america floor or roof fire notes 1.