Attachment 12 Column Base - Structural Fix.pdf

This is a construction detail drawing for a column base modification project. The document illustrates the specifications for retrofitting existing exterior columns with new Douglas Fir (D.F.) material at the base, with a total height of 4 feet 0 inches. The work includes removing the lower 12 inches of outside columns and replacing them with new #1 D.F. lumber, infilling between columns with #1 D.F. filler material measuring 3 1/2" by 4 17/32" by 4" in dimension.

The construction details specify multiple through-bolt installations with countersink and plug requirements: four 1/2" bolts at the base connection and two 1/2" bolts at three intermediate locations along the column height. Additional work includes replacing all 1/2" bolts, cleaning and sanding the existing base, and applying paint to prepared surfaces. The drawing designates new construction elements with solid lines and existing elements to remain with dashed lines, scaled at 1 1/2" = 1'-0" for the column base detail. All bolt connections require countersinking and plugging to provide a finished appearance.