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// CODE SNIPPET

2603.13 Cladding Attachment Over Foam Sheathing to Wood Framing

Building Code 2018 of Illinois > 26 Plastic > 2603 Foam Plastic Insulation > 2603.13 Cladding Attachment Over Foam Sheathing to Wood Framing
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Cladding shall be specified and installed in accordance with Chapter 14 and the cladding manufacturer's installation instructions. Where used, furring and furring attachments shall be designed to resist design loads determined in accordance with Chapter 16. In addition, the cladding or furring attachments through foam sheathing to framing shall meet or exceed the minimum fastening requirements of Section 2603.13.1 or 2603.13.2, or an approved design for support of cladding weight.
Exceptions:
  1. Where the cladding manufacturer has provided approved installation instructions for application over foam sheathing, those requirements shall apply.
  2. For exterior insulation and finish systems, refer to Section 1407.
  3. For anchored masonry or stone veneer installed over foam sheathing, refer to Section 1404.

2603.13.1 Direct Attachment

Where cladding is installed directly over foam sheathing without the use of furring, minimum fastening requirements to support the cladding weight shall be as specified in Table 2603.13.1.
TABLE 2603.13.1
CLADDING MINIMUM FASTENING REQUIREMENTS FOR DIRECT ATTACHMENT OVER FOAM PLASTIC SHEATHING TO SUPPORT CLADDING WEIGHTa
CLADDING
FASTENER
THROUGH FOAM
SHEATHING INTO:
CLADDING
FASTENER TYPE
AND MINIMUM
SIZEb
CLADDING
FASTENER
VERTICAL
SPACING
(INCHES)
MAXIMUM THICKNESS OF FOAM SHEATHINGc (INCHES)
16" o.c. fastener horizontal spacing24" o.c. fastener horizontal spacing
Cladding weight:Cladding weight:
3 psf11 psf18 psf25 psf3 psf11 psf18 psf25 psf
Wood Framing (minimum 11/4- inch penetration)0.113" diameter nail62.001.450.75DR2.000.85DRDR
82.001.00DRDR2.000.55DRDR
122.000.55DRDR1.85DRDRDR
0.120" diameter nail63.001.700.900.553.001.050.50DR
83.001.200.60DR3.000.70DRDR
123.000.70DRDR2.15DRDRDR
0.131" diameter nail64.002.151.200.754.001.350.70DR
84.001.550.80DR4.000.90DRDR
124.000.90DRDR2.700.50DRDR
0.162" diameter nail64.003.552.051.404.002.251.250.80
84.002.551.450.954.001.600.850.50
124.001.600.850.504.000.95DRDR
For SI: 1 inch = 25.4 mm, 1 pound per square foot (psf) = 0.0479 kPa.
DR = Design Required, o.c. = on center.
  1. Wood framing shall be spruce-pine-fir or any wood species with a specific gravity of 0.42 or greater in accordance with ANSI/AWC NDS.
  2. Nail fasteners shall comply with ASTM F1667, except nail length shall be permitted to exceed ASTM F1667 standard lengths.
  3. Foam sheathing shall have a minimum compressive strength of 15 psi in accordance with ASTM C578 or ASTM C1289.

2603.13.2 Furred Cladding Attachment

Where wood furring is used to attach cladding over foam sheathing, furring minimum fastening requirements to support the cladding weight shall be as specified in Table 2603.13.2. Where placed horizontally, wood furring shall be preservative-treated wood in accordance with Section 2303.1.9 or naturally durable wood and fasteners shall be corrosion resistant in accordance with Section 2304.10.5.
TABLE 2603.13.2
FURRING MINIMUM FASTENING REQUIREMENTS FOR APPLICATION OVER FOAM PLASTIC SHEATHING TO SUPPORT CLADDING WEIGHTa, b
FURRING MATERIAL FRAMING MEMBER FASTENER TYPE AND MINIMUM SIZE MINIMUM PENETRATION INTO
WALL FRAMING (INCHES)
FASTENER SPACING IN
FURRING (INCHES)
MAXIMUM THICKNESS OF FOAM SHEATHINGd (INCHES)
16" o.c. furringe24" o.c. furringe
Siding weight:Siding weight:
3 psf11 psf18 psf25 psf3 psf11 psf18 psf25 psf
Minimum 1x Wood FurringcMinimum 2x Wood Stud0.131" diameter nail11/484.002.451.450.954.001.600.85DR
124.001.600.85DR4.000.95DRDR
164.001.10DRDR3.050.60DRDR
0.162" diameter nail11/484.004.002.451.604.002.751.450.85
124.002.751.450.854.001.650.75DR
164.001.900.95DR4.001.05DRDR
No. 10 wood screw1124.002.301.200.704.001.400.60DR
164.001.650.75DR4.000.90DRDR
244.000.90DRDR2.85DRDRDR
1/4" lag screw11/2124.002.651.500.904.001.650.80DR
164.001.950.950.504.001.10DRDR
244.001.10DRDR3.250.50DRDR
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.
  1. Wood framing and furring shall be spruce-pine-fir or any wood species with a specific gravity of 0.42 or greater in accordance with ANSI/AWC NDS.
  2. Nail fasteners shall comply with ASTM F1667, except nail length shall be permitted to exceed ASTM F1667 standard lengths.
  3. Where the required cladding fastener penetration into wood material exceeds 3/4 inch and is not more than 11/2 inches, a minimum 2-inch nominal wood furring or an approved design shall be used.
  4. Foam sheathing shall have a minimum compressive strength of 15 psi in accordance with ASTM C578 or ASTM C1289.
  5. Furring shall be spaced not greater than 24 inches on center in a vertical or horizontal orientation. In a vertical orientation, furring shall be located over wall studs and attached with the required fastener spacing. In a horizontal orientation, the indicated 8-inch and 12-inch fastener spacing in furring shall be achieved by use of two fasteners into studs at 16 inches and 24 inches on center, respectively.

Related Code Sections


2603.13 Plastic, Cladding Attachment Over Foam Sheathing to Wood Framing
wood furring is used to attach cladding over foam sheathing, furring minimum fastening requirements to support the cladding weight shall ...
Building Code 2021 of Illinois > 26 Plastic > 2603 Foam Plastic Insulation > 2603.13 Cladding Attachment Over Foam Sheathing to Wood Framing
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to attach cladding over foam sheathing, furring minimum fastening requirements to support the cladding weight shall be as specified in Table 2603.13.2 ...
Building Code 2018 of Illinois > 26 Plastic > 2603 Foam Plastic Insulation > 2603.13 Cladding Attachment Over Foam Sheathing to Wood Framing
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Building Code 2021 of Illinois > 26 Plastic > 2603 Foam Plastic Insulation > 2603.12 Cladding Attachment Over Foam Sheathing to Cold-Formed Steel Framing > 2603.12.2 Furred Cladding Attachment
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Where steel or wood furring is used to attach cladding over foam sheathing, furring minimum fastening requirements to support ...
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