Section R610 — STRUCTURAL INSULATED PANEL WALL CONSTRUCTION
2025 California Residential Code (Title 24, Part 2.5) · 2025 edition · ingested 2026-07-07 · California
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R610.1 General. ¶
R610.1 General. Structural insulated panel (SIP) walls shall be designed in accordance with the provisions of this section. Where the provisions of this section are used to design structural insulated panel walls, project drawings, typical details and specifications shall not exempt construction documents from the requirement to be stamped by a California licensed architect or engineer. Notwithstanding other sections of law, the law establishing these provisions is found in Business and Professions Code Sections 5537.1 and 6737.1.
R610.2 Applicability limits. ¶
R610.2 Applicability limits. The provisions of this section shall control the construction of exterior structural insulated panel walls and interior load-bearing structural insulated panel walls for buildings not greater than 60 feet (18 288 mm) in length perpendicular to the joist or truss span, not greater than 40 feet (12 192 mm) in width parallel to the joist or truss span and not greater than two stories in height with each wall not greater than 10 feet (3048 mm) high. Exterior walls installed in accordance with the provisions of this section shall be considered as load-bearing walls.…
R610.3 Materials. SIPs shall comply with the requirements of ANSI/APA PRS 610.1. ¶
R610.3 Materials. SIPs shall comply with the requirements of ANSI/APA PRS 610.1. R610.3.1 Lumber. The minimum lumber framing material used for SIPs prescribed in this document is NLGA graded No. 2 Sprucepine-fir. Substitution of other wood species/grades that meet or exceed the mechanical properties and specific gravity of No. 2 Spruce-pine-fir shall be permitted. R610.3.2 SIP screws. Screws used for the erection of SIPs as specified in Section R610.5 shall be fabricated from steel, shall be provided by the SIP manufacturer and shall be sized to penetrate the wood member to which the assembly…
R610.4 SIP wall panels. ¶
R610.4 SIP wall panels. SIPs shall comply with Figure R610.4 and shall have minimum panel thickness in accordance with Tables R610.5(1) and R610.5(2) for above-grade walls. SIPs shall be identified by grade mark or certificate of inspection issued by an approved agency in accordance with ANSI/APA PRS 610.1. (HCD 1 and HCD 2) Note: See the California Factory-Built Housing Law, Health and Safety Code Section 19960 et seq.; and the California Code of Regulations, Title 25, Division 1, Chapter 3; which require building components as addressed in the definition of “factory-built housing” to bear…
R610.5 Wall construction. ¶
R610.5 Wall construction. Exterior walls of SIP construction shall be designed and constructed in accordance with the provisions of this section and Tables R610.5(1) and R610.5(2) and Figures R610.5(1) through R610.5(5). SIP walls shall be fastened to other wood building components in accordance with Tables R602.3(1) through R602.3(4). Framing shall be attached in accordance with Table R602.3(1) unless otherwise provided for in Section R610. TABLE R610.5(1)—MINIMUM THICKNESS FOR SIP WALL<brSUPPORTING SIP OR LIGHT-FRAME ROOF ONLY…
R610.6 Interior load-bearing walls. ¶
R610.6 Interior load-bearing walls. Interior load-bearing walls shall be constructed as specified for exterior walls.
R610.7 Drilling and notching. ¶
R610.7 Drilling and notching. The maximum vertical chase penetration in SIPs shall have a maximum side dimension of 2 inches (51 mm) centered in the panel. Vertical chases shall have a minimum spacing of 24 inches (610 mm) on center. Not more than two hori on Jul 18, 2025 11:14 AM (CDT) THEREUNDER. WALL CONSTRUCTION zontal chases shall be permitted in each wall panel, one at 14 inches (360 mm) plus or minus 2 inches (51 mm) from the bottom of the panel and one at 48 inches (1220 mm) plus or minus 2 inches (51 mm) from the bottom edge of the SIP’s panel. Additional penetrations are permitted…
R610.8 Headers. ¶
R610.8 Headers. SIP headers shall be designed and constructed in accordance with Table R610.8 and Figure R610.5.1. SIP headers shall be continuous sections without splines. Headers shall be not less than 11 [7] / 8 inches (302 mm) deep. Headers longer than 4 feet (1219 mm) shall be constructed in accordance with Section R602.7. The strength axis of the factors on the header shall be oriented horizontally. FIGURE R610.8—TYPICAL SIP WALL PANEL-TO-PANEL CONNECTION DETAILS FACING MATERIAL IN SURFACE SPLINE 8d NAIL AT 6 IN. O.C. EACH SIDE OF SIP SIDE OF SIP FACING MATERIAL IN SIDE OF SIP BLOCK…