INSTALLING VERSATEX

Managing Expansion and Contraction

Movement occurs due to temperature fluctuations. This movement is restricted to the length of the product. The product will not swell or shrink like wood experiencing a moisture cycle. VERSATEX, like any PVC trim, will expand (lengthen) when it warms and contract (shrink) when it cools. 

Tips on Expansion and Contraction

  • Expansion and contraction is ONLY an issue on longer “runs” (rake, fascia, frieze) comprised of multiple pieces of 18’ boards (short lengths, around windows for example, can and should be built with tight joints).
  • The more the product is mechanically fastened or bonded on longer runs, the less likely it will move.
  • Screws restrict movement more than nails.
  • As a rule, if you can bend the fastener in your fingers it is too thin (no wire or brad nails). 18 galv. and 16 galv. trim nails are not recommended.
  • You can further restrict movement on longer runs by reducing on center fastening to 12”.
  • Southern exposure, or areas where product is in direct sunlight, can result in greater movement. More fasteners should be used &/or wider expansion joints.
  • Allow VERSATEX to acclimate to outside temperature before installing – if possible install long runs when boards and outside temperature are approximately 60-70°F.
  • Shiplap joints offer a superior joint, especially on long runs.
  • At a minimum, scarf 45° miter cut joints. Do not butt joints.
  • All joints in high traffic or visible areas should be glued tight. Expansion/Contration joints should be placed in inconspicuous areas along the run of trim.

Best Practice to Control Expansion and Contraction at Board Joints

Method #1: Glue the Joints Secure (High Traffic Areas)

  1. Ship lap or 45-degree miter cut the boards at the joint, and glue the boards together with VERSATEX Weld-on #705 or another acceptable PVC cement.
  2. When possible, apply construction adhesive to back side of boards. Liquid Nail Sub Floor Adhesives or Heavy Duty Construction adhesive works well when attaching a VERSATEX fascia board to a sub fascia.
  3. Double fasten on both sides of joint (remember screws work best). Use proper amount of fasteners based on width of boards.
  4. If necessary, allow for movement at the ends of the boards or at inconspicuous joints.
Better Methods – Click below to view drawing
Method #1: Glue the Joints Secure; Shiplap Method #1: Glue the Joints Secure; Miter Cut

Method #2: Leaving an Expansion Joint

  1. Based on temperature at time of installation (see chart below) create a gap between boards.
  2. Follow proper fastening methods previously outlined.
  3. Place UV resistant acrylic based or polymer based sealant in joint between boards (NPC Solar Seal #900 or equal is recommended).
  4. Never completely fill joint with sealant. Leave room to compensate for joint closure.
Best Methods – Click below to view drawing
Method #2: Leaving an Expansion Joint; Shiplap Method #2: Leaving an Expansion Joint; Miter Cut