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| Building Code Requirements |
Generally, building codes require pressure-treated or naturally durable wood for the following applications:
- Wood joists or the bottom of structural floors without joists that are within 18" of exposed soil.
- Wood girders and beams closer than 12" to exposed soil.
- Plates, sills and sleepers on concrete or masonry that is in direct contact with soil.
- Wood in permanent structures closer than 6" to soil.
- Wood supporting moisture-permeable roofs and floors exposed to weather unless separated by an impervious moisture barrier.
- Wood framing members (including sheathing), which rest on foundation walls and are less than 8" from soil.
When used in enclosed locations, the moisture content of the wood should be 19% or less at time of permanent enclosure.
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