There must also be a 6-13mm abutting gap between the boards and other objects such as garden walls or houses. The Trex Hideaway Hidden Fasteners will automatically measure the 6mm gap between grooved edge boards but you must still ensure the 6mm gap with the square edge boards.Īll deck boards must always be installed with a 3-5mm end-to-end or end-to-width gap between boards. The size of the gaps required also depends on the temperature in which they’re being installed so please check the official Trex Installation guide PDFĪll deck boards must always be installed with a 6mm side-to-side gap. Therefore, it is essential to install the boards with gaps as recommended below by Trex. Some important points about gapping and spacingĪs daily temperatures change, all deck boards will expand & contract. Multiply your deck length x width to calculate your square metres area. Now divide by 7.3 = 32.87 - So say 33 Trex boards. Now divide by 7.3.Įxample Your new deck is 16-foot-long by 15 wide.ġ6x15 = 240 square feet. Multiply your deck length x width to calculate your square feet area. You can also find them at lumber or home improvement. Imperial feet (old school) based on the 16ft boards. Composite boards from Trex and other manufacturers can be ordered online. So how many of our Trex Boards will you need? If laying boards on an angle,Īn approximate increase of 15% may be required. Following the proper gapping will ensure that your deck looks great year after year. Another reason for gapping is to account for the shrinkage of the pressure-treated joists. Gapping is necessary to facilitate drainage and for the slight thermal expansion and contraction of Trex. You may need additional boards for vertical areas, steps, angled patterns & flower boxes.Ĭalculations provided for boards installed at a 90-degree angle. Trex decking must be gapped, both end-to-end and width-to-width. This is guide to calculate roughly how many boards you will need for the main area of your deck. The recommended gap spacing between boards is 6mm side to side. Our boards are 144 mm wide and 22mm thick. At TJ O’Mahony.ie our Trex composite decking boards are all 16-foot-long (That’s 4.88 metres)
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