Wood 2 Hour Fire Rated Ceiling
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Lumber shall be identified by the grade mark of a lumber.
Wood 2 hour fire rated ceiling. 276 fire rated ceiling assemblies suspension ceiling designs floor ceiling designs a003 3 hr. 3 mineral wool batts. Wood joists wood i joists floor trusses and flat or pitched roof trusses spaced a maximum 24 o c. On a related note the woman who answers the phone at the gysum association is very knowledgable about fire ratings.
Refer to the fire resistance rating summary to determine the ul design numbers and ceiling system products that correspond to the fire rated assemblies that meet your needs. Table 1 one hour fire rated loadbearing wood frame wall assemblies. With 1 2 wood structural panels with. 12 x 24 2 x 4 8 w10 x 25 beam floor units and beam support 3 hr.
Concrete with cellular steel 3 hr. Drywall end joints located midway between continuous channels and attached to additional pieces of channel 62 1575 mm long with screws 12 305 mm. Ul n501 two layers of 5 8 15 9 mm fire shield wallboard applied to beam cage fabricated from. Ceiling provides one hour fire resistance protection for wood framing.
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. 2x4 16 o c. 3 4 fr 83 12 x 12 z runners fluorescent type none 2 1 2 concrete. 2 fire rated wood frame wall and floor ceiling assemblies.
By code i need a minimum 1 2 hour rating. Ibc table 721 3 item 21 1 1 describes a single prescriptive 1 hour rated floor or roof assembly that includes wood trusses. 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. 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.
Sheathing on both sides. Urb concealed grid system and tile. Tested a number of wood frame fire resistance rated as semblies see photos. Description 1 2 hr.
With 1 25 mm type s drywall screws 12 305 mm o c. Gypsum wallboard beam fireproofing 8wf24 or heavier cad file name goldn dwg or goldn dxf no. And 12 of r 38 fiberglass batt insulation. Assemblies rated from both sides.
Determine the existing or planned building elements including structural mechanical electrical and finish materials in the fire rated assembly. 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.
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