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2 hour fire rated ceiling

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  • 2 hour fire rated ceiling

    Does anyone have suggestions on how to construct a 2 hour fire rated ceiling?

    [The ceiling is actual wooden 2x8's and the floor above is finished with 1" wooden sheathing.]

    Any thoughts on techniques and materials???

    Thank you

  • #2
    Re: 2 hour fire rated ceiling

    Try this web site. they have several different ways to achieve different ratings.


    http://www.usg.com

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    • #3
      Re: 2 hour fire rated ceiling

      first hang 5/8" drywall to the ceiling, mud and tape seams, then run metal firring perpendicular to the joist and hang 5/8" drywall to the firring and finish. this will give you a 2hr. fire rating

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      • #4
        Re: 2 hour fire rated ceiling

        If the reason you need a 2 hr fire rated ceiling is due to an occupancy separation ie: dwelling below and storage above (usuable attic space) it is possible to obtain a two hr rating. You do need two layers of 5/8 type X sheetrock (standard 5/8 board won't do). The sheetrock must be on both sides of the structural members. On the ceiling side, the suppports must be a minimum of 16" OC- on the floor side, the sheetrock may be placed over the subfloor and covered with a solid flooring material. The floor side of the separation may also be covered with a ridgid cement board with the proper fire rating- or light weight concrete. Check with your local building offical. Be aware of the weight you're adding to the ceiling / floor structure- not only the sheetrock, but the additional weight from the added storage. What is the span of the 2X8 joists? Be sure not to overload your framing members.

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