Installation Guide

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 sot application of siding
products must not exceed 16 in. o.c.
• For siding used as sot 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 ashed.
• 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 ashed. The cut edge must
be primed and painted.
• Vegetation must not be in direct contact with the
siding.
SEALING
• Use the best quality exible, 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 ash 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 nish-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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