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R317.1.2 Ground Contact
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All wood in contact with the ground, embedded in concrete in direct contact with the ground or embedded in concrete exposed to the weather that supports permanent structures intended for human occupancy shall be approved pressure-preservative-treated wood suitable for ground contact use, except that untreated wood used entirely below groundwater level or continuously submerged in fresh water shall not be required to be pressure-preservative treated.
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R317.1.2 Building Planning, Ground Contact
All wood in contact with the ground, embedded in concrete in direct contact with the ground or embedded in concrete exposed to the weather ...
2015 Washington State Residential Code > 3 Building Planning > R317 Protection of Wood and Wood-Based Products Against Decay > R317.1 Location Required > R317.1.2 Ground Contact
2304.12.3 Wood, Wood in Contact With the Ground or Fresh Water
Wood used in contact with exposed earth shall be naturally durable for both decay and termite resistance or preservative treated in accordance ...
2015 Washington State Building Code > 23 Wood > 2304 General Construction Requirements > 2304.12 Protection Against Decay and Termites > 2304.12.3 Wood in Contact With the Ground or Fresh Water