
TREX® Installation
Trex is made from reclaimed & recycled materials. There are two "ingredients" in Trex - waste wood
fiber and reclaimed plastics, such as grocery sacks and stretch film.
To make Trex, approximately equal amounts of waste wood fiber and reclaimed plastic are combined. The wood fiber comes primarily from woodworking operations, while the plastic material is reclaimed mainly from stretch film and grocery sacks. During the "mixing" of these elements, the plastic actually surrounds and protects the individual wood fibers, giving Trex many of its superior weather-resistant properties. Trex contains no virgin wood or virgin plastics. No preservatives or treatments are added during its manufacture. Cutting/Drilling TREX You can cut Trex just like regular wood. We recommend using carbide tipped blades and router bits. Blades with fewer teeth (18-24 for a 7¼" circular saw blade) provide the best results. Work with Trex as you would any wood; however, you need not worry about grain direction or knots...Trex doesn't have any! When drilling large or deep holes, periodically lift the drill bit out of the hole to draw the shavings out. Even though splintering is not a factor with Trex, it is still recommended that you cut Trex slowly for an even edge. Decking Span For basic deck construction, the following chart lists the recommended center-to-center joist spacing for Trex (fastened to a minimum of 3 joists).
Gapping Requirements As with any decking material, width-to-width gapping is essential for drainage, as well as changes in dimension due to temperature. A gap of 1/8" will satisfy most installation conditions. However, larger gaps of 3/16" to 1/4" allow for easier cleaning and better drainage.
![]() When joining Trex end-to-end, gapping is also required. The size of the gap required will depend on the length of the boards, the temperature at the time of installation, and the highest anticipated temperature in the local area. As a rule of thumb, for 16' boards and smaller, allow 1/16" end gap for every 20 degrees Fahrenheit difference between installation temperature and the highest temperature expected during the year.
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