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Air gap btwn conc planter wall / wood framed wall behind it?

Discussion in 'Commercial Building Codes' started by Yikes, Sep 13, 2019.

  1. Yikes

    Yikes Gold Member

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    I 'm designing a new apartment project with raised poured-in-place concrete planters immediately adjacent to the wood-framed exterior wall of the apartment.
    I first thought about simply building the wood apartment wall on top of he planter stem wall, but then I would need to furr-out on the inside of the bedroom for insulation, losing valuable floor space.
    I'm not looking at doing a double-wall, where the wood-framed apartment wall extends down to slab-on-grade, and there is a second, separate raised planter wall next to it.

    Question: years ago I remember something in the code saying I had to separate these 2 walls with a 2" air gap. Is that still in the code?
    All I could find was a requirement in IBC 2304.12.1.3 to keep untreated wood walls out of "direct contact" with the raised concrete planter, with no specific gap measurement mentioned:
    upload_2019-9-13_11-56-36.png
     
  2. steveray

    steveray Sawhorse

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    Get "burial grade" PT and go.....And even that I imagine you would still have some Grace or other WP product on the exterior?
     
  3. Yikes

    Yikes Gold Member

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    steveray, maybe that's the way to go. I still would have to work on the constructability of it. I.e., if it is a one-hour wood framed wall, do I need to build the foundaion, then the wall, lath-and plaster it, then re-mobilize the concrete sub to build the planter wall next to it? Or is there a way to stop the plaster short of the planter and have the planter wall itself become part of the one-hour assembly?

    so many questions...
     

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