![]() Exterior wood screws push the composite material up, causing an unsightly mushroom effect on the board.Īlways use two screws per joist and install screws flush with the decking surface. You can use composite deck screws to fasten boards to the joists, but never use exterior wood screws with composite deck boards. By attaching directly to the joist and into the grooved edge of our board, Trex Hideaway® Universal Hidden Fasteners achieve consistent gapping and leave the top of your deck with no visible screw heads. Always follow gapping guidelines for width-to-width and end-to-end measurements. Proper gapping of the deck boards, which allows for drainage and expansion and contraction of the boards, is critically important. If you want to minimize the appearance of joists through the spaces between boards, cover the joists with Trex® Protect™ tape or paint the top of your joists black. For heavy items such as hot tubs and planters, consult your local building code office for span requirements which vary from locality to locality. 24" on center can only be used with 2圆 Trex in residential or commercial applications at 100psf or less and some wood decking. ![]() ![]() Joists must be spaced on center at either 12”, 16” or 24” depending upon the size of the deck board and whether it will be used for residential or commercial use. Ignoring the proper installation guidelines for both can ruin the build before you even get started. The success of your deck build begins with the proper joist spanning and gapping. ![]()
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