Cal. Code Regs. tit. 25 § 4316

Current through Register 2024 Notice Reg. No. 39, September 27, 2024

Section 4316 - Placement and Size of Holes and Notches in Joists, Beams, Plates, and Studs

(a) Joist.

(1) A notch on the end of a joist must not be deeper than one-fourth (1/4) the depth of the joist.

(2) The edge of a hole bored in a joist must be at least two (2) inches from the top and at least two (2) inches from the bottom of the joist. The diameter of the hole must not exceed one-third (1/3) the depth of the joist.

(3) A notch in the top or bottom of a joist must not be deeper than one-sixth (1/6) the depth of the joist. The notch must not be located in the middle one-third (1/3) of the span of the joist.

(b) A hole in a ridge beam must not be more than 2 inches in diameter and must be located in the middle one-third (1/3) of the depth of the beam.

(c) Top or bottom wall plate or a sill plate.

(1) A hole must not exceed 40% of the width of the plate,

(2) The edge of a hole must be at least 5/8 inch from any edge of the plate.

(3) The edge of a hole must be separated by at least 12 inches from the nearest edge of other holes or notches in the same plate.

(d) Wall studs.

(1) A hole in a wall stud must not exceed 40% of the width of the stud,

(2) The edge of a hole in a wall stud must be at least 5/8 inch from any edge of the stud.

(3) A hole in a wall stud must not be located in the middle one-third (1/3) of the length of the stud.

(4) Only one hole is allowed in the upper or lower one-third (1/3) length of a wall stud.

Cal. Code Regs. Tit. 25, § 4316

1. New section filed 1-17-2001; operative 1-17-2001 pursuant to Government Code section 11343.4(c) (Register 2001, No. 3).
2. Amendment of subsections (b) and (c) filed 2-10-2011; operative 3-12-2011 (Register 2011, No. 6).

Note: Authority cited: Sections 18015, 18025, 18029 and 18029.5, Health and Safety Code. Reference: Sections 18015, 18025, 18029, 18029.5 and 18030.5, Health and Safety Code.