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Thread: 4" Box Gyp Clg.

  1. #1
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    4" Box Gyp Clg.

    Have a bunch of fire alarm devices mounted in gyp boardceiling that need 4” box. Usually use a T-Bar hanger when have 2x2 acousticalceilings. What is typically used to support box in gyp board ceiling? Thanks.

  2. #2
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    Is the sheet rock already up ? If not use a bar box

    Sent from my SM-G950U using Tapatalk

  3. #3
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    If the device fits an octagon box I would do as Nick suggested.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  4. #4
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    Quote Originally Posted by infinity View Post
    If the device fits an octagon box I would do as Nick suggested.
    I think there is a dysfunction going on here.

    O.P says they are 2'x2' accoustic ceiling tiles. Never heard of gypsum sheet rock, t-bar mounted ceiling tiles.

    They are too heavy for T-bar mounting. There are gypsum board accoustic panels but they are for wall mounting and 4' x 4' feet typically--not 2'
    x 2'.

    There are special t-clips for box mounting used in accoustic ceilings. You may need additional wire hangers (sometimes required) for the T-bar if you install a device.
    The ceiling accoustic tiles are lightweight--only a fraction of the weight compared to gypsum sheet rock boards.

    Look in commercial applications for this specific installs.

    Seems like you haven't done commercial before?

  5. #5
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    Quote Originally Posted by myspark View Post
    I think there is a dysfunction going on here.

    O.P says they are 2'x2' accoustic ceiling tiles. Never heard of gypsum sheet rock, t-bar mounted ceiling tiles.

    They are too heavy for T-bar mounting. There are gypsum board accoustic panels but they are for wall mounting and 4' x 4' feet typically--not 2'
    x 2'.

    There are special t-clips for box mounting used in accoustic ceilings. You may need additional wire hangers (sometimes required) for the T-bar if you install a device.
    The ceiling accoustic tiles are lightweight--only a fraction of the weight compared to gypsum sheet rock boards.

    Look in commercial applications for this specific installs.

    Seems like you haven't done commercial before?
    You misread the OP. He said that when using 2X2 tiles he uses T-bar hangers. Now he has a Sheetrock ceiling to deal with.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  6. #6
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    4" Box Gyp Clg.

    Quote Originally Posted by myspark View Post
    ....Never heard of gypsum sheet rock, t-bar mounted ceiling tiles.

    They are too heavy for T-bar mounting. There are gypsum board accoustic panels but they are for wall mounting and 4' x 4' feet typically--not 2'
    x 2'.
    Every kitchen I’ve worked in has gypsum ceiling tile panels.

    Also in 2hr rated ceilings.

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  7. #7
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    Quote Originally Posted by brantmacga View Post
    Every kitchen I’ve worked in has gypsum ceiling tile panels.
    And for some reason they feel twice as heavy as a piece of drywall the same size.
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

  8. #8
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    Quote Originally Posted by brantmacga View Post
    Every kitchen I’ve worked in has gypsum ceiling tile panels.

    Also in 2hr rated ceilings.

    Sent from my iPhone using Tapatalk
    We are talking about accoustic ceiling. Local department of health does not allow porous surfaces in places where food is prepared.

    A homeowner can have anything she/he wants but that doesn't mean having porous ceiling or walls (in kitchen) is an accepted practice and sanctioned by regulators.

    Surfaces must be impervious.(non-absorbent).

  9. #9
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    Quote Originally Posted by myspark View Post
    We are talking about accoustic ceiling. Local department of health does not allow porous surfaces in places where food is prepared.

    A homeowner can have anything she/he wants but that doesn't mean having porous ceiling or walls (in kitchen) is an accepted practice and sanctioned by regulators.

    Surfaces must be impervious.(non-absorbent).
    They make gypsum tiles for lay-in style ceilings. From USG:

    features and benefits

    USG Sheetrock® Brand Lay-in Gypsum Ceiling Panels are the ultimate choice for meeting USDA/FSIS requirements. Aside from adhering to government standards, they offer excellent fire protection. USG Clean Room® panels are also available that meet Class 100/ISO Class 5 and 10M-100M clean room standards.

    • USG Clean Room® panels have a vinyl-laminated face with sealed back and edges for use in clean room environments up to Class 100/ISO Class 5
    • Washable and scrubbable finish — impact and scratch resistant
    • USDA Certified Biobased Product
    • Low-emitting product meets CA Specification 01350, California Department of Health Services Standard Practice for the testing of VOC emissions
    • Panels meet USDA/FSIS requirements for food processing areas
    • ClimaPlus™ 30-year lifetime system warranty against visible sag
    https://www.usg.com/content/usgcom/e...ng-panels.html

    Back to the OP this has nothing to do with lay-in ceilings.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  10. #10
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    Planet macmikeman
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    !/4" threaded rod hangers. 1/4-20 nuts with washer's to hold the box in place. Drop anchor to the concrete (?) ceiling above or else, if wood, then a spearpoint coupling screwed into the wood or beams. Cordless band saw makes or breaks such a job.
    85deg. an Sunny today.

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