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Thread: dry wall burn times

  1. #1

    Default dry wall burn times

    My inspector wants minimum one hour burn time in the hallway. What is the burn time of 1/2" and what is the burn time of 5/8" dry wall?

  2. #2

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    You have provided way too little information on design of wall, whether this wall is separating two different areas or an exterior wall and what those areas are classified for if separating two different areas. Then what is the wall made of. I am guessing right now to be wood studs with layers of drywall but not sure. All this changes the fire resistant rating of different thickness of drywall.

    If you are building a stud wall with drywall on both sides and if that is allowed in your use then to make a 1 hour fire wall it would take 2x4 wood studs 16" on center with one layer of 1/2" drywall layed verticle then plastering together a second layer of 1/2" drywall layed horizontal installed on both sides of that stud wall if this is an interior separating wall.

    If you wood studs are 24" on center we start over in its design to make a one hour fire wall using 5/8" type X drywall you would use only one layer on each side of the wall.

    Sorry I guessed what you were doing but still unsure the fire rating of your building or use and whether exterior or interior and other factors.

    Nails used to mount both types of fire wall are required to be cooler type nails or drywall nails listed for this use.

    Code reference number would be Internation building code table 720.1 (2).

    Hope this helps some

    Wg
    Last edited by Wgoodrich; December 20th, 2007 at 05:42 PM.

  3. #3

    Default

    Agreed.


    Spec of rock and install is crucial on this, including Mudd type I would guess.

  4. #4

    Default Fire Rating of Walls/Ceilings

    Quote Originally Posted by Guseppie View Post
    My inspector wants minimum one hour burn time in the hallway. What is the burn time of 1/2" and what is the burn time of 5/8" dry wall?
    The inspector wants you to satisfy a fire code requirement for a fire separation between areas. The "burn time" you speak of is called the UL Fire Classification Rating of the complete wall/ceiling assembly. Sheet rock manufacturers submit their materials to UL in finished assemblies (wall board, supports, fasteners) and each assembly gets constructed to specific configurations (wall board type, thickness, fastener type, spacing, support type and spacing) and the "finished assembly" gets tested for a specific duration. If it passes that "duration", the finished assembly gets that UL Classification for the "burn time" it was tested. If the inspector is looking for a one-hour "burn time" or fire rating, you'll need to get that assembly and, most importantly, build it to the exact specification used in that fire test. Usually you can contact the sheet rock manufactures on their websites and get their UL Classification ratings for the assemblies they've tested. Or, you can contact a Fire Protection Engineer or the local fire marshal for help.

    Good Luck!

  5. #5
    Join Date
    Nov 2004
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    Quote Originally Posted by Wgoodrich View Post
    If you wood studs are 24" on center we start over in its design to make a one hour fire wall using 5/8" type X drywall you would use only one layer on each side of the wall.

    Hope this helps some
    Wg
    If you have 16" OC can't you just use 5/8" on a 2x4 wall?
    That sounds easier then 2 layers of 1/2"
    Is it the same for a 2x6 wall?
    DIY Homeowner...not a Pro or licensed electrician

  6. #6

    Default

    Below is a recreation of the International Building Code concerning fire rated walls, wood studs & drywall;

    TABLE 720.1(2)

    RATED FIRE-RESISTANCE PERIODS FOR VARIOUS WALLS AND PARTITIONS 14.Wood studs—interior partition with gypsum wallboard each side

    1 hour fire rated wall;

    2″ × 4″ wood studs 16″ on center with two layers of 3/8″ regular gypsum
    wallboarde each side, 4d coolern or wallboardn nails at 8″ on center first layer, 5d coolern or wallboardn nails at 8″ on center second layer with laminating compound between layers, joints staggered. First layer applied full length vertically, second layer applied horizontally or vertically


    1 hour fire rated wall;

    2″ × 4″ wood studs 16″ on center with two layers 1/2″ regular gypsum wallboard applied vertically or horizontally each side, joints staggered. Nail base layer with 5d coolern or wallboard nails at 8″ on center face layer with 8d coolern or wallboardn nails at 8″ on center.

    1 hour fire rated wall;

    2″ × 4″ wood studs 24″ on center with 5/8″ Type X gypsum wallboarde applied vertically or horizontally nailed with 6d coolern or wallboardn nails at 7″ on center with end joints on nailing members. Stagger joints each side.

    1 hour fire rated wall;

    2″ × 4″ fire-retardant-treated wood studs spaced 24″ on center with one layer of 5/8″ Type X gypsum wallboarde applied with face paper grain (long dimension) parallel to studs. Wallboard attached with 6d coolern or wallboardn nails at 7″ on center.


    2 hour fire rated wall;

    2″ × 4″ wood studs 16″ on center with two layers 5/8″ Type X gypsum wallboard each side. Base layers applied vertically and nailed with 6d coolern or wallboard nails at 9″ on center. Face layer applied vertically or horizontally and nailed with 8d coolern or wallboardn nails at 7″ on center. For nail-adhesive application, base layers are nailed 6″ on center. Face layers applied with coating of approved wallboard adhesive and nailed 12″ on center.


    Hope this helps

    Wg

  7. Default drywall burn time

    Drywall burn time One hour Equals one sheet of 5/8

    The double layer of half inch vertical the horizonal we do not do no more, that was befor 5/8.

    hope this helped

    Joe Steelman

  8. #8

    Default Drywall Thickness

    Drywall Thickness and Burn time Suppression:

    Half inch = twenty minutes
    Five-eighths inch = sixty minutes
    Three quarter inch = seventy-five minutes
    One and one quarter inch = one hundred twenty minutes

  9. #9

    Default dry wall burn times

    rmwilli4
    I read it that the two storey outbuilding belonged to the poster, and hence the two storey retaining wall is party .

  10. #10
    Join Date
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    4 year old post. I hope it is resolved by now.
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