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Section R610 Structural Insulated Panel Wall Construction
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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 are not required to bear the seal of the architect or engineer responsible for design, unless otherwise required by the state law of the jurisdiction having authority.
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. Structural insulated panel walls constructed in accordance with the provisions of this section shall be limited to sites where the ultimate design wind speed (Vult,) is not greater than 155 miles per hour (69 m/s), Exposure B or 140 miles per hour (63 m/s) Exposure C, the ground snow load is not greater than 70 pounds per foot (3.35 kPa), and the seismic design category is A, B or C.
SIPs shall comply with the following criteria:
The core material shall be composed of foam plastic insulation meeting one of the following requirements:
For SI: 1 pound per cubic foot = 16.02 kg/m3, 1 pound per square inch = 6.895 kPa, °C = [(°F) - 32] 1.8.
- ASTM C578 and have a minimum density of 0.90 pounds per cubic feet (14.4 kg/m3).
- Polyurethane meeting the physical properties shown in Table R610.3.1.
- An approved alternative.
|Density, core nominal (ASTM D1622)||2.2 lb/ft3|
|Compressive resistance at yield or 10% deformation, whichever occurs first (ASTM D1621)||19 psi (perpendicular to rise)|
|Flexural strength, min. (ASTM C203)||30 psi|
|Tensile strength, min. (ASTM D1623)||35 psi|
|Shear strength, min. (ASTM C273)||25 psi|
|Substrate adhesion, min. (ASTM D1623)||22 psi|
|Water vapor permeance of 1.00-in. thickness, max. (ASTM E96)||2.3 perm|
|Water absorption by total immersion, max. (ASTM C272)||4.3% (volume)|
|Dimensional stability (change in dimensions), max.
[ASTM D2126 (7 days at 158°F/100% humidity and 7 days at -20°F)]
Facing materials for SIPs shall be wood structural panels conforming to DOC PS 1 or DOC PS 2, each having a minimum nominal thickness of 7/16 inch (11 mm) and shall meet the additional minimum properties specified in Table R610.3.2. Facing shall be identified by a grade mark or certificate of inspection issued by an approved agency.
For SI: 1 inch = 25.4 mm, 1 lbf-in2/ft = 9.415 × 10-6 kPa/m, 1 lbf-in/ft = 3.707 × 10-4 kN/m, 1 lbf/ft = 0.0146 N/mm, 1 pound per cubic foot = 16.018 kg/m3.
- Values listed in Table R610.3.2 are qualification test values and are not to be used for design purposes.
- Mean test value shall be in accordance with Section 7.6 of DOC PS 2.
- Characteristic test value (5th percent with 75% confidence).
- Density shall be based on oven-dry weight and oven-dry volume.
Adhesives used to structurally laminate the foam plastic insulation core material to the structural wood facers shall conform to ASTM D2559 or approved alternative specifically intended for use as an adhesive used in the lamination of structural insulated panels. Each container of adhesive shall bear a label with the adhesive manufacturer's name, adhesive name and type and the name of the quality assurance agency.
The minimum lumber framing material used for SIPs prescribed in this document is NLGA graded No. 2 Spruce-pine-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.
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 is being attached by not less than 1 inch (25 mm). The screws shall be corrosion resistant and have a minimum shank diameter of 0.188 inch (4.7 mm) and a minimum head diameter of 0.620 inch (15.5 mm).
Nails specified in Section R610 shall be common or galvanized box unless otherwise stated.
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