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Thread: 1 hour fire wall

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    Sawhorse chris kennedy's Avatar
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    1 hour fire wall

    Plans show an existing 1hr wall, one layer 5/8 rock on each side, 3 5/8 stud. Took quite a while longer than expected to install 7 new outlets.

    Quotes are from the 08 NEC unless otherwise noted.

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    Sawhorse
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    Not sure if that is a listed one hour wall

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    Sawhorse chris kennedy's Avatar
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    Quote Originally Posted by cda View Post
    Not sure if that is a listed one hour wall
    Is that a bit of humor?
    Quotes are from the 08 NEC unless otherwise noted.

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    better get some looong screws for the receptacle!

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    ya can't always depend on the prints. Wow, a 2 & 3/4 mud ring.

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    Sawhorse
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    More importantly......how do you patch it and maintain the (3 hour?) rating?
    Please support Jim Brown, Deputy Building Official from Gillette, Wyoming for ICC Board of Directors.
    My questions and answers are based on some bastardized hodge podge starting with the 2003 I-codes amended by the state of CT in 2005 and 2009 including the 2005 NEC ....and as of today.....The 2011 Connecticut Amendments to the 2009 International Energy Conservation Code portion of the 2005 State Building Code has been posted to the State Building Inspector’s website

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    Is it a fire wall or a fire partition or a fire barrier? Fire walls have to remain in place upon the collapse of the building on either side. Fire partitions are often rated partitions used in corridors. Fire barrier are used for occupancy separation and shafts and require the same rating as the wall for their supporting structure. Office software will not let me see picture. I think others have answered your question.
    Chaos, Panic, Disorder.....my work is done here.
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    Sawhorse Builder Bob's Avatar
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    Looks like a practice where a three hour rating was required and somebody let them place the required rating on one side of the wall. Often, a common practice when dealing with existing buildings.

    3/4" sheet rock with 3 - 5/8" layers of sheet rock ..... Things that make you go Hhhhhmmmmmmm.....
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    Quote Originally Posted by Builder Bob View Post
    Looks like a practice where a three hour rating was required and somebody let them place the required rating on one side of the wall. Often, a common practice when dealing with existing buildings.
    Please tell me you are joking.

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    The Gypsum Association has some interesting 2, 3, and 4 hour rated walls that are asymmetric. WP 1529 and WP 1943 are examples.

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