Installation Guide

5
K. CORN
ERS FASCIA & RAKE BOARDS
SECURE PIECES PROPERLY When framing members (rafters, outlookers, etc.) are not located
where Primed Trim Board
pieces join, install 1-1/4” solid blocking first and then nail the Trim to it.
Fasten from the face of one Trim member into the edge of another by pre-drilling pilot holes and
inserting stainless steel wood screws.
L. CLEARANCE
REMEMBER: 8, 2, ¼ Water table or skirt boards and corner boards must be a minimum of 8” to 9”
above the finish grade. Trim that extends down to a roof (dormers, second floors, etc.) and decks
requires a minimum 2” gap to avoid wicking. Flashing is imperative, but maintain a 1/4” gap for a
capillary break.
M. FLASHING AT OPENINGS & HORIZONTAL PROFILES
Proper flashing is imperative. Flashing is an important line of defense against water in wall
assemblies. Use flashing to intercept and direct the flow of water away from the building to designed
drainage paths. Install horizontal flashing extending from the top of all windows and doors and where
there is any change in material or direction. The flashing should tilt downward (~30o) to allow water
to drain away from the wall. Do not caulk where the flashing and Trim or other materials meet. Note
that caulking in lieu of flashing is not acceptable.
N. CAULKING
TYPE: Use exterior grade high-performance acrylic-latex, silicone, acrylic, or urethane caulks and
sealants to seal gaps around windows, doors, corners, and other joints that are exposed to potential
water intrusion.
REQUIRES MAINTENANCE: Caulking is not a permanent solution and as such requires regular
maintenance. If not inspected and maintained, caulking may fail and trap water, creating severe water
problems. Do not rely on it as the only barrier to water penetration. Do not caulk areas that will
prevent water from escaping the wall cavity (e.g., under windows and around flashing).
AVOID 3-SIDED ADHESION. The caulk should only adhere to the two surfaces that create the
opening in the surface plane, not to any rigid substrate behind. For gaps wider than 1/4 inch, insert a
backer rod into gaps where caulk seals are to be made, and then caulk over. In all cases, follow the
caulking manufacturer’s recommendations.
O. DECK & COLUMN WRAPS
When using Primed Trim to face
building materials such as treated lumber, structural beams and
posts, or any framing material, always apply housewrap before installing any finishing material.
Where Primed Trim Boards are used to finish rim joists, protect the top edge from water intrusion by
applying a strip of self-adhesive membrane over the rim joist and Primed Trim Board. It is important
that water not pool between the framing lumber and the decorative Primed Trim Boards.
Incorp
orate an air cavity. Columns wrapped in Primed Trim Boards must be constructed to
incorporate an air cavity between the Primed Trim Boards and the underlying core. Ventilation
and drain holes must be included at the top and bottom to ensure proper airflow and drainage.
P. PRIME ALL CUTS