Wood 2 Hour Fire Rated Ceiling

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.

Wood 2 hour fire rated ceiling.

Wood joists wood i joists floor trusses and flat or pitched roof trusses spaced a maximum 24 o c. 3 mineral wool batts. The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels. Description 1 2 hr.

By code i need a minimum 1 2 hour rating. Gypsum wallboard beam fireproofing 8wf24 or heavier cad file name goldn dwg or goldn dxf no. 12 x 24 2 x 4 8 w10 x 25 beam floor units and beam support 3 hr. 2x4 16 o c.

Urb concealed grid system and tile. 5 8 toughrock fireguard c gypsum board or 5 8 densarmor plus fireguard c gypsum panel ul g505 only applied perpendicular to rigid furring channels 24 610 mm o c. Elements of buildings the fire resistance rating classifies the ability of an assembly to confine and isolate fire within a zone comprised of fire resistance rated walls ceiling and floor assemblies. On a related note the woman who answers the phone at the gysum association is very knowledgable about fire ratings.

276 fire rated ceiling assemblies suspension ceiling designs floor ceiling designs a003 3 hr. 3 4 fr 83 12 x 12 z runners fluorescent type none 2 1 2 concrete. With 1 25 mm type s drywall screws 12 305 mm o c. And 12 of r 38 fiberglass batt insulation.

Ibc table 721 3 item 21 1 1 describes a single prescriptive 1 hour rated floor or roof assembly that includes wood trusses. Assemblies rated from both sides. Lumber shall be identified by the grade mark of a lumber. Table 1 one hour fire rated loadbearing wood frame wall assemblies.

2 fire rated wood frame wall and floor ceiling assemblies. Sheathing on both sides. Ceiling provides two hour fire resistance protection for wood framing where that note is included the entire rating is provided by the gypsum and you don t need a particular floor. Drywall end joints located midway between continuous channels and attached to additional pieces of channel 62 1575 mm long with screws 12 305 mm.

Tested a number of wood frame fire resistance rated as semblies see photos. 5 8 type x gypsum wallboard h 2 6 type s drywall screws 12 o c. Descriptions of successfully tested lumber wall assemblies are provided in table 1 for one hour fire resistance rated wall assemblies and table 2 for two hour fire resistance rated wall assemblies. Ul n501 two layers of 5 8 15 9 mm fire shield wallboard applied to beam cage fabricated from.

With 1 2 wood structural panels with. Ceiling provides one hour fire resistance protection for wood framing.