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The cost of Trex decking installation is dependent on several factors. First, decking takes a considerable amount of time and labor. Installation for a 250-square-foot area may cost an average of $8 per square foot; however, prices may be altered when difficult materials and tough-to-reach areas are involved.
Some other composites run about $2/linear ft. For a 12X12 deck you need 288 linear ft of 6 wide decking boards so that would be 24 boards @ 12'long X 6 wide. For Trex the cost would be about $700, for PT about $300.Like Bookmark February 24, 2008 at 11:23AM.or a 12X12 deck you need 288 linear ft of 6 wide decking boards so that would be 24 boards @ 12'long X 6 wide. For Trex the cost would be about $700, for PT about $300. Like Bookmark February 24, 2008 at 11:23AM.