lumber grades

Posts tagged #lumber grades

1 article tagged with “lumber grades”.

Pressure-treated wooden deck stairs leading down to a garden

Pressure-Treated Lumber Grades for Outdoor Stairs: UC Ratings Explained

Pressure-treated lumber stamps hide a UC rating that decides how long outdoor stairs last. Learn what UC3B, UC4A, and UC4B mean, which stair parts need which rating, and which fasteners survive ACQ or MCA treatment.

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