2603.12.1 Direct attachment.
BC § 2603.12.1
Where cladding is installed directly over foam sheathing without the use of furring, cladding minimum fastening requirements to support the cladding weight shall be as specified in Table 2603.12.1. Table 2603.12.1Cladding Minimum Fastening Requirements for Direct Attachment over Foam Plastic Sheathing to Support Cladding Weight a Cladding Fastener Through Foam Sheathing Into:Cladding Fastener Type and Minimum Size bCladding Fastener Vertical Spacing (inches)Maximum Thickness of Foam Sheathing c (inches)162 o.c. fastener horizontal spacing242 o.c. fastener horizontal spacingCladding weightCladding weight3 psf11 psf25 psf3 psf11 psf25 psfSteel framing (minimum penetration of steel thickness plus 3 threads)#8 screw into 33 mil steel or thicker6331.532DR8320.531.5DR1231.5DR30.75DR#10 screw into 33 mil steel6432430.5843142DR1242DR31DR#10 screw into 43 mil steel or thicker64434428442431.512431.543DR For SI: 1 inch = 25.4 mm; 1 pound per square foot (psf) = 0.0479 kPa, 1 pound per square inch = 0.00689 MPa. DR = design required; o.c. = on center. a. Steel framing shall be minimum 33 ksi steel for 33 mil and 43 mil steel and 50 ksi steel for 54 mil steel or thicker. b. Screws shall comply with the requirements of AISI S240. c. Foam sheathing shall have a minimum compressive strength of 15 pounds per square inch in accordance with ASTM C 578 or ASTM C 1289.
