Maryland-based building materials dealer TW Perry has announced that beginning in the spring of 2016, it will only stock pre-treated lumber that is rated for ground contact use. The company will switch from stocking UC3B-rated products to UC4A and will upgrade their UC4A materials to UC4B. The change is in response to concern for early rotting in PT lumber. TW Perry has noted that other companies also want to implement TW Perry's plan.

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