Yes, treated wood typically has a clearance-to-soil requirement, depending on the type of preservative used and intended application. Here’s a clear breakdown:
🔨 General Rule: Keep Treated Wood Above Soil Unless Rated for Ground Contact
1. Above-Ground Treated Wood
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Minimum Clearance: Usually at least 6 inches above the soil.
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Use: Deck framing, railings, or other components not in direct contact with the ground.
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Reason: Even though treated, these materials are not designed to withstand constant moisture and fungal exposure from soil contact.
2. Ground-Contact Treated Wood
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No Clearance Required: Can be in direct contact with soil or moisture.
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Use: Posts, retaining walls, fence posts, landscaping timbers, or any part of a structure that is difficult to maintain or prone to wet conditions.
🔎 Why Clearance Matters
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Soil retains moisture and harbors fungi and insects.
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Even treated wood can decay prematurely if not rated for ground contact.
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Code compliance (e.g., IRC, IBC, AWPA standards) often dictates what type of treated wood can be used where.
📘 Referenced Standard: AWPA Use Categories
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UC3B: Above-ground, exposed — needs clearance.
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UC4A/UC4B/UC4C: Ground contact — can touch soil directly.
✅ Bottom Line:
Always check the wood's treatment rating before installation:
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If it’s not specifically rated for ground contact (UC4), maintain a minimum 6-inch clearance from soil.
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