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vertical reinforcement for residential masonry walls (GEORGIA)

Discussion in 'Residential Foundation Codes' started by ScottinGA, Dec 14, 2011.

  1. ScottinGA

    ScottinGA Member

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    hey guys im new to the forum, but have been reading tons of posts since joining last week. I've got a question some of you may can answer. Where can i find the maximum wall height of an 8" masonry crawlspace wall before it needs vertical reinforcement? (little or no unbalanced backfill) It seems like i read somewhere a requirement for vertical reinforcement. i must be dreaming. any help would be appreciated.

    thx

    scott
     
  2. mtlogcabin

    mtlogcabin Sawhorse

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    2009 IRC

    TABLE R404.1.1(1)

    PLAIN MASONRY FOUNDATION WALLS

    It would be based on soils, size of masonry, is it solid grouted?

    Not possible in my seismic zone "D 2"

    Welcome to the board
     
    #2 mtlogcabin, Dec 14, 2011
    Last edited by a moderator: Dec 14, 2011
  3. steveray

    steveray Sawhorse

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    What MT said....there are some tables in chapter 4......we have alot of unreinforced concrete foundations here.....my understanding is that will all be going away with the adoption of the 2009 IRC......
     
  4. gbhammer

    gbhammer Platinum Member

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    Why do you need a 'crawl space' that high?
     
  5. gbhammer

    gbhammer Platinum Member

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    :)Welcome to the board
     
  6. ScottinGA

    ScottinGA Member

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    thanks for comments guys, it is 8" masonry ungrouted, seismic C, +2000lb soil typ around here. The wall height is 56" at its tallest. I was thinking somewhere there was a reference to 5xthe minimum width, but they may have been referencing something else. i hate when i cant find what im looking for. thx agin
     
  7. iggentleman

    iggentleman Bronze Member

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    Table 404.1.1(5) in IRC 2006 and table 404.1.2(8) in the 2009 are pretty much the same. A lot of situations still won't require reinforcing.
     
  8. JBI

    JBI Sawhorse

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    Welcome to the Board ScottinGA. 2,000 pound soil refers to bearing capacity, what you need is the classification from 405 (the unified soil classification designation). That said, most of the classifications in the 2,000 pound range are in the lower section of class 1 soils and a couple that are class 2. ALL have low expansion potential, that's the good news. Low expansion potential means it won't push too hard on the walls when it rains (good to medium drainage characteristics). Probably going to land in the first or second set of wall conditions in Table R404.1.1(1) (table 5 would be for concrete, not masonry...). The three factors that are needed are total wall height, unbalanced backfill height and soil classification. For example, SW and SP soils would allow an 8" plain masonry wall as tall as 9' provided backfill height is limited to 5' or less. The SM-SC, GM and GC soils would only allow 8" plain masonry at 9' tall to have a maximum of 4' of unbalanced backfill. Conversely, a 6' wall with those soils would allow 6' and 5' unbalanced backfill respectively.
     
  9. ScottinGA

    ScottinGA Member

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    i appreciate the help

    thx

    scott
     
  10. Daddy-0-

    Daddy-0- Moderator

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    Welcome to the arena Scott
     
  11. David Henderson

    David Henderson Sawhorse

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