Installation Instructions

7
Managing the expansion and contraction
y PVC products expand and contract through
temperature changes. This movement must be
taken in consideration when working with the
products.
y The amount of movement of a board is in relation to
it’s length. Therefore, the longer the board, the more
movement is likely.
y Window trim is typically assembled prior to
installation on the wall and are small enough not to
need additional expansion joints, etc.
y See drawing below for guidance on longer pieces.
y Glue scarf joint
y Cut board short for expansion
y Hide with adjacent board
y Fasteners 2” from ends max.
y Glue all miters
y DO NOT glue ship lap to allow for movement
Less then 12’ glued both ends
Managing expansion on longer runs
Above 50

F
Below 50

F
ǩ”
Coat
Glue
Place a fastener 2” from the seam on both sides.