FASTENING • Use corrosion resistant boxhead nails with a minimum head diameter of 1/4 in. (10% variance allowed). • Fastening must not exceed 16 in. o.c. (see Framing section for 24 in. o.c. stud spacing). • All lap products require that the butt joints be located on the studs and nailed at the joints (see Fig. 2). • Nails must penetrate wood framing 1-1/2 in. • Avoid countersinking nails or rupturing the surface of the siding. If countersinking occurs, seal nail prior to painting (see Fig. 1). • Fasten from end to end or center to end to avoid internal stress. • Nailing schedule for soffit application of siding products must not exceed 16 in. o.c. • For siding used as soffit material, the siding must be nailed 12 in. or 16 in. o.c. into the framing. GAPS AND CORNERS • Leave 3/16 in. gap around all doors, window frames and corners. Seal all gaps (see Fig. 2 & 3). BUTT JOINTS • All butt joints must be located over studs. • Leave 3/16 in. gap at all butt joints (see Fig. 2). Stacked Butt Joints (see Fig. 5) Vertically aligning butt joints at a common location on the wall is strongly recommended. Joints should be gapped at least 3/16 in., sealed, then vertical trim is applied over the joints. This method minimizes long term homeowner maintenance. Staggered Butt Joints (see Fig. 6) If butt joints are staggered, vertical butt joint covers are required to protect the butt joints. Sealing butt joints in lieu of joint covers is permitted but not recommended as it requires a higher degree of homeowner maintenance.
CLEARANCES • Siding must have a minimum 2 in. separation from concrete or be appropriately flashed. • Siding must be 6 in. from soil or landscaping material. • Where the siding meets the roof, it must be spaced a minimum of 2 in. from the plane of the roof and be properly flashed. The cut edge must be primed and painted. • Vegetation must not be in direct contact with the siding. SEALING • Use the best quality flexible, paintable, mildew- resistant exterior grade sealant material that meets ASTM C920, Class 25 or higher. • Seal around all openings such as window and door frames and at butt joints. • Seal all overdriven nails (see Fig. 1) • Seal or flash all horizontal trim material in a manner that creates proper out-sloping. PAINTING • Touch up damaged areas with premium acrylic latex primer or premium alkyd oil-based primer. • Siding must be finish-painted within 90 days after installation. If siding is exposed for a longer period, reprime the siding. • Siding must be clean and dry when paint is applied. • Use only premium acrylic latex paint or premium alkyd oil-based paint containing an appropriate amount of mildewcide for local moisture conditions. • For best performance, use 100% acrylic latex paints or 100% acrylic latex solid body (opaque) stain. • Follow paint manufacturer’s recommendations for engineered wood siding.
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