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Subchapter 4. Construction Safety Orders
Article 29. Erection and Construction
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§1709. General Requirements.

(a) No building, structure, or part thereof, or any temporary support or scaffolding in connection therewith shall be subjected to any load beyond its design load strength, unless the employer determines, based on information received from a qualified person who is experienced in structural design, that the structure or portion of the structure is capable of safely supporting the load. For the purpose of this subsection, the design load strength refers to the load bearing capacity of a structural member(s) computed on the basis of the allowable stresses which are assumed in the design.

(b) Bracing.

(1) Trusses and beams shall be braced laterally and progressively during construction to prevent buckling or overturning.

(2) The first member shall be plumbed, connected, braced and/or guyed against shifting before succeeding members are erected and secured to it.

(3) The total system shall be adequately braced and stabilized to the foundation, to suitable anchors buried in the ground, or by other equivalent method(s).

(4) Beams, trusses and other material being lifted and placed by cranes or other hoisting apparatus shall not be released from the crane or hoisting apparatus until the person detaching the load has verified that the load has been secured or supported to prevent inadvertent movement.

(c) Wood Floor Construction.

(1) In the erection of a building having double wood floor construction, the rough flooring shall be completed as the building progresses, including the tier below the one on which floor joists are being installed.

(2) For single wood floor or other flooring systems, the floor immediately below the story where the floor joists are being installed shall be kept planked or decked over.

(d) Erection Guide for Trusses and Beams Over 25 Feet Long. The employer shall provide an erection plan and procedure prepared by a civil engineer currently registered in California which shall be followed and kept available on the job site for inspection by the Division.

Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. Renumbering from section 1710 filed 11-1-73; effective thirtieth day thereafter (Register 73, No. 44).

2. Amendment filed 6-21-85; effective thirtieth day thereafter (Register 85, No. 25).

3. Editorial correction adding article heading (Register 91, No. 23).

4. Amendment of section heading, designation of first paragraph as subsection (a) and new subsections (b)-(d) filed 5-1-2002; operative 5-1-2002. Submitted to OAL for printing only pursuant to Labor Code section 142.3(a)(3) (Register 2002, No. 18).

5. Amendment of subsection (a) filed 12-29-2010; operative 1-28-2011 (Register 2010, No. 53).


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