Page 15 - Vi-LUX Building Products PVC Moulding & Trim Solutions
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Gaps
The amount of gap required depends on various factors; the length of the piece being installed, the overall range of temperatures experienced over the year, exposure to the sun, and the temperature at the time of installation. When installing longer pieces in cold weather (25 to 55°F), leave a gap of about 1/8" per 12' length. (For shorter pieces the gap can be less). In warmer weather (75°F or over), do not leave a gap, providing the product is warm when applied.
Seal Joints and Gaps
To prevent joint separation,  ll all joints (whether butted tight
or with a gap) with a urethane acrylic sealant (which expands and contracts at the same rate as the product). Two recommended products are Pro-Series Quad Window, Siding, Gutter & Roof Sealant from OSI (www.osiproseries.com), and Bond & Fill Structural Adhesive & Filler (www.bond ll.com). When sealing a butt joint, apply sealant only to one butt end, and apply to the front half of the butt end only, so the sealant can expand back into the joint. Ensure good contact between the sealant and the two butt ends. Touch up irregular areas with additional sealant, and tool normally.
Adhesives
Ensure all surfaces to be glued are smooth and clean. Use exterior-grade, PVC compatible, urethane- based adhesives. Two recommended products are Pro-Series Quad Window, Siding, Gutter & Roof Sealant from OSI (www.osiproseries.com), and Bond & Fill Structural Adhesive & Filler (www.bond ll.com). When fastening to PVC substrates, use white PVC gutter cement; note that PVC gutter cement tends to turn yellow over time outdoors, so it should not be used in visible applications. AVOID using silicone-based
adhesives. Clamping or other mechanical fastening is recommended to hold product in place while adhesive cures. For all adhesives, follow the adhesive manufacturer’s recommendations.
Bonding to other surfaces: Vi-LUX mouldings and trim can also be bonded to a variety of substrates. Speci c substrate combinations require speci c adhesives: contact cement, epoxy, rubber-based adhesives, or urethane-based adhesives. Ensure to use appropriate cement for each substrate. Always follow the adhesive manufacturer’s instructions, and check the bond on a test piece before proceeding with the installation.
Fastening
For longer lengths of product,
begin at one end and work to
other end or at middle and fasten
outwards. NEVER fasten from both
ends toward the middle, which
can create stress and expansion
problems. Fasten at 16" intervals along the length, and keep nails and screws at least 3/4" from ends and edges to avoid splitting. Fastener heads should be  ush with the surface of the trim or slightly indented and no closer than 3/4" from the end of the board.
Nails
Use corrosion-resistant, smooth-shank, screw, annular-threaded or spiral type nails, at least 6d in size (shank diameter of 0.090"), and long enough to penetrate substrate by at least 1.5". AVOID large-head nails and ring-shank nails due to excessive heat during fastening. When installing, nail  ush to avoid the need for  nishing holes. In cold weather (below 32°F), pre-drilling is recommended to avoid cracking. If using a power air nailer, adjust the length of stroke (not the air pressure) to control nail depth.
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