Wash. Admin. Code § 296-150C-1000 - Drilling or notching of wood wall structural members
(1)
Cutting and notching. In
exterior walls and bearing partitions, any wood stud may be cut or notched to a
depth not exceeding twenty-five percent of its width. Cutting or notching of
studs to a depth not greater than forty percent of the width of the stud is
permitted in nonbearing partitions supporting no loads other than the weight of
the partition.
(2)
Bored
holes. A hole not greater in diameter than forty percent of the stud
width may be bored in any wood stud. Bored holes not greater than sixty percent
of the width of the stud are permitted in nonbearing partitions or in any wall
where each bored stud is doubled, provided not more than two such successive
doubled studs are so bored.
In no case shall the edge of the bored hole be nearer than 5/8 inch (16mm) to the edge of the stud. Bored holes shall not be located at the same section of stud as a cut or notch.
(3) Drilling or notching of studs greater
than allowed in subsection (1) or (2) of this section must be substantiated by
engineering analysis.
Notes
Statutory Authority: RCW 43.22.340, [43.22.]355,[43.22.]360 , [43.22.]432, [43.22.]440 and [43.22.]480. 96-21-146, § 296-150C-1000, filed 10/23/96, effective 11/25/96.
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