What Are the Best Quality Pressure-Treated Lumber Grades?
https://todayshomeowner.com/general/reviews/best-quality-pressure-treated-lumber-grades/
WEBJul 7, 2022 · Pressure-treated lumber must be graded by a government official who inspects the wood for defects like splits, grain patterns, knots, insect damage, and so on. In order of descending quality, pressure-treated lumber is graded SS (premium/select), #1, #2, and #3. Beyond grade 3, lumber is considered useless in a construction scenario and is ...
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