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Technical Evaluation Report(TER) 5.3. Design Procedure: 5.3.1. Calculate the fastener spacing. Step 1: Determine the spacing between studs or framing members, either 16" or 24"on-center. Step 2: Calculate the correct thickness of rigid foam, up to 4", needed to obtain the required insulation effect or R-value. Step 3: Choose the furring or sheathing (substrate) material that the cladding will be affixed to: 1. Minimum 3/4"x 3-W wood or Wood Structural Panel (WSP)furring 2. Minimum 3/8"WSP sheathing Ensure that the substrate allows for cladding connections that are compliant with the cladding manufacturer's installation and connection instructions and meet applicable building code. Step 4: Determine the actual weight for the dadding materials being installed, per square foot, as given by the cladding manufacturer's specifications. Note: 1. Typical cladding weights are 1.3 psf for vinyl siding, 2.5 psf for cement board siding, 11 psf for Portland cement stucco and 25 psf for adhered masonry veneer; use actual weights for materials installed. 2. Wood furring may add up to 1 psf of additional weight;wood sheathing may add up to 1.5 psf depending on thickness. Step 5: Using these four values together, find the proper fastening pattern of between 6" and 24" on- center using Table 2. Recommended Fastener Spacing Maximum Allowable Cladding Weight(psf)to be Supported 10 15 20 25 30 10 15 20 25 30 Stud Foam Fastener Spacing When Using 3/4"x 3-1/2"Wood Fastener Spacing When Using Spacing Thickness or WSP Furring 3Is"WSP Sheathing 1 1.5 24 o.c. 16 o.c. 16 2 16 o.c. 12 o.c. 12 o.c. 3 16 o.c. 12 o.c. 8 o.c. 4 12 o.c. 04 8 o.c 1 24 o.c. 12 1.5 16 o.c. o.c. 12 o.c. 24 2 12 o.c. ko.c.; 8 o.c. 3 16 o.c12 o.c. 80.c. 4 604 1.Wood framing(studs)shall be a minimum of 2"nominal thickness. 2.Wood framing and furring shall be minimum Spruce-Pine-Fir or any species with specific gravity,G,of 0.42 or greater. 3.Wood framing,furring,and sheathing shall be of adequate size,species,and grade to resist design loads and requirements in accordance with the applicable building code. 4.Furring may be installed vertically or horizontally and shall be installed at the same on center spacing as the studs.All fasteners shall be installed through the furring and into the studs with a minimum 2"of penetration.Alternately,where the furring is installed horizontally,and where the required fastener spacing is 8"o.c.or 12"o.c.,the furring may be installed at 16" o.c.or 24"o.c.,respectively,provided two fasteners are installed at stud location.Likewise,where the fastener spacing is 6"o.c.,the furring may be installed horizontally at 12"o.c. and two fasteners used at each stud. 5.Maximum allowable cladding weight shall include weight of furring,sheathing,cladding and other supported materials. 6.Furring type and thickness shall be selected based on the cladding manufacturer's installation requirements(e.g.required fastener penetration into furring). 7.When using horizontal furring or where durability of the furring is a concern due to moisture between the cladding and the sheathing,consideration should be given to using preservative treated furring. Table 2:Recommended Fastener Spacing for Various Thicknesses of Foam Sheathing, TER No. 1009-01 Page 4 of 12 Use of FastenMaster HeadLOKTM Fasteners to Attach Cladding and/or Furring to Wood Framing through Foam Sheathing