Page 375 - 2018_IRC

WALL CONSTRUCTION

R609.7.2.1 Masonry, concrete or other structural SECTION R610
substrate. Where the wood shim or buck thickness is STRUCTURAL INSULATED
1
less than 1 / inches (38 mm), window and glass door PANEL WALL CONSTRUCTION
2
assemblies shall be anchored through the jamb, or by R610.1 General. Structural insulated panel (SIP) walls shall
jamb clip and anchors shall be embedded directly into be designed in accordance with the provisions of this section.
the masonry, concrete or other substantial substrate Where the provisions of this section are used to design struc-
material. Anchors shall adequately transfer load from tural insulated panel walls, project drawings, typical details
the window or door frame into the rough opening sub- and specifications are not required to bear the seal of the
strate [see Figures R609.7.2(1) and R609.7.2(2)]. architect or engineer responsible for design, unless otherwise
Where the wood shim or buck thickness is 1 / 2 required by the state law of the jurisdiction having authority.
1
inches (38 mm) or more, the buck is securely fastened R610.2 Applicability limits. The provisions of this section
to the masonry, concrete or other substantial substrate, shall control the construction of exterior structural insulated
and the buck extends beyond the interior face of the panel walls and interior load-bearing structural insulated panel
window or door frame, window and glass door assem- walls for buildings not greater than 60 feet (18 288 mm) in
blies shall be anchored through the jamb, or by jamb length perpendicular to the joist or truss span, not greater than
clip, or through the flange to the secured wood buck. 40 feet (12 192 mm) in width parallel to the joist or truss span
Anchors shall be embedded into the secured wood buck and not greater than two stories in height with each wall not
to adequately transfer load from the window or door greater than 10 feet (3048 mm) high. Exterior walls installed in
frame assembly [see Figures R609.7.2(3), R609.7.2(4) accordance with the provisions of this section shall be consid-
and R609.7.2(5)]. ered as load-bearing walls. Structural insulated panel walls
R609.7.2.2 Wood or other approved framing constructed in accordance with the provisions of this section
material. Where the framing material is wood or shall be limited to sites where the ultimate design wind speed
other approved framing material, window and glass (V ) is not greater than 155 miles per hour (69 m/s) in Expo-
ult
door assemblies shall be anchored through the sure B or 140 miles per hour (63 m/s) in Exposure C, the
frame, or by frame clip, or through the flange. ground snow load is not greater than 70 pounds per square foot
Anchors shall be embedded into the frame construc- (3.35 kPa), and the seismic design category is A, B or C.
tion to adequately transfer load [see Figures R610.3 Materials. SIPs shall comply with the requirements of
R609.7.2(6), R609.7.2(7) and R609.7.2(8)]. ANSI/APA PRS 610.1.
R609.8 Mullions. Mullions shall be tested by an approved R610.3.1 Lumber. The minimum lumber framing mate-
testing laboratory in accordance with AAMA 450, or be engi- rial used for SIPs prescribed in this document is NLGA
neered in accordance with accepted engineering practice. graded No. 2 Spruce-pine-fir. Substitution of other wood
Mullions tested as stand-alone units or qualified by engineer- species/grades that meet or exceed the mechanical proper-
ing shall use performance criteria cited in Sections R609.8.1, ties and specific gravity of No. 2 Spruce-pine-fir shall be
R609.8.2 and R609.8.3. Mullions qualified by an actual test permitted.
of an entire assembly shall comply with Sections R609.8.1
and R609.8.3. R610.3.2 SIP screws. Screws used for the erection of SIPs
as specified in Section R610.5 shall be fabricated from
R609.8.1 Load transfer. Mullions shall be designed to steel, shall be provided by the SIP manufacturer and shall
transfer the design pressure loads applied by the window be sized to penetrate the wood member to which the
and door assemblies to the rough opening substrate. assembly is being attached by not less than 1 inch (25
R609.8.2 Deflection. Mullions shall be capable of resist- mm). The screws shall be corrosion resistant and have a
ing the design pressure loads applied by the window and minimum shank diameter of 0.188 inch (4.7 mm) and a
door assemblies to be supported without deflecting more minimum head diameter of 0.620 inch (15.5 mm).
than L/175, where L is the span of the mullion in inches. R610.3.3 Nails. Nails specified in Section R610 shall be
R609.8.3 Structural safety factor. Mullions shall be common or galvanized box unless otherwise stated.
capable of resisting a load of 1.5 times the design pressure R610.4 SIP wall panels. SIPs shall comply with Figure
loads applied by the window and door assemblies to be R610.4 and shall have minimum panel thickness in accor-
supported without exceeding the appropriate material dance with Tables R610.5(1) and R610.5(2) for above-grade
stress levels. If tested by an approved laboratory, the 1.5 walls. SIPs shall be identified by grade mark or certificate of
times the design pressure load shall be sustained for 10 inspection issued by an approved agency in accordance with
seconds, and the permanent deformation shall not exceed ANSI/APA PRS 610.1.
0.4 percent of the mullion span after the 1.5 times design
pressure load is removed.

350 2018 INTERNATIONAL RESIDENTIAL CODE ®
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