THERMAL EXPANSION The Zip-UP UnderDeck® System is made of high quality PVC material. PVC will contract and expand with severe temperature changes. It is recommend to allow for the expansion of the Zip-UP UnderDeck® System by punching elongated holes in the Main Rails with a vinyl siding hole punch before making the attachment. Use screws with washers and only use enough torque to secure the Main Rails to the joist yet allowing for movement of the Main Rails for thermal expansion.
BEFORE YOU BEGIN Preparing your deck for simple Installations: Take a good look at the area you are finishing. A typical deck will have the joists running perpendicular to the house. You will need to install Pitching Rails that will induce a slope of 2 inches over 16 feet to allow for water runoff. You do this by attaching Pitching Rails to your joists, spread out about every 4 feet with each Pitching Rail getting progressively thicker.
BEFORE YOU BEGIN Preparing your deck for simple Installations: Take a good look at the area you are finishing. A typical deck will have the joists running perpendicular to the house. You will need to install Pitching Rails that will induce a slope of 2 inches over 16 feet to allow for water runoff. You do this by attaching Pitching Rails to your joists, spread out about every 4 feet with each Pitching Rail getting progressively thicker.
THERMAL EXPANSION The Zip-UP UnderDeck® System is made of high quality PVC material. PVC will contract and expand with severe temperature changes. It is recommend to allow for the expansion of the Zip-UP UnderDeck® System by punching elongated holes in the Main Rails with a vinyl siding hole punch before making the attachment. Use screws with washers and only use enough torque to secure the Main Rails to the joist yet allowing for movement of the Main Rails for thermal expansion.
