Wood 2 Hour Fire Rated Ceiling

Ul n501 two layers of 5 8 15 9 mm fire shield wallboard applied to beam cage fabricated from. By code i need a minimum 1 2 hour rating. And 12 of r 38 fiberglass batt insulation.

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Wood 2 hour fire rated ceiling.

Ceiling provides one hour fire resistance protection for wood framing. 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. 5 8 type x gypsum wallboard h 2 6 type s drywall screws 12 o c.

Lumber shall be identified by the grade mark of a lumber. Assemblies rated from both sides. 3 mineral wool batts. 2 fire rated wood frame wall and floor ceiling assemblies.

Determine the existing or planned building elements including structural mechanical electrical and finish materials in the fire rated assembly. Urb concealed grid system and tile. 3 4 fr 83 12 x 12 z runners fluorescent type none 2 1 2 concrete. Ibc table 721 3 item 21 1 1 describes a single prescriptive 1 hour rated floor or roof assembly that includes wood trusses.

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. Description 1 2 hr. With 1 2 wood structural panels with. Sheathing on both sides.

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. Concrete with cellular steel 3 hr. On a related note the woman who answers the phone at the gysum association is very knowledgable about fire ratings. Tested a number of wood frame fire resistance rated as semblies see photos.

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. 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. The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels.

Wood joists wood i joists floor trusses and flat or pitched roof trusses spaced a maximum 24 o c. 12 x 24 2 x 4 8 w10 x 25 beam floor units and beam support 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. 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.

2x4 16 o c. 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.

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