95 X 50 MM (4 X2") MIGHTY LUMBER is 100% recycled plastic lumber used as decking joists to build a subframe to support your decking. Unlike timber joists, they will not rot and can be used directly on flat solid ground. If you are raising your decking subframe off the ground the joists will need support (Ground Screws /Pedestals/Posts) at least every 0.9 Metres for the subframe to be structurally sound. If you have the height available we do advise for you to go for the 140 mm high lumber as it is far stronger and these joists only need support every 1.4 Metres (1400 mm) so you would save on the number of supports needed if you are raising your subframe off the ground. Quantities If you are using these to create a composite decking subframe , your decking will need joist support every 300 mm, double joists when boards are meeting end to end and of course all around the edge so add all these up to get your total linear metres, then divide by 3.6 and round up. If you are installing Bullnose Edge Boards along decking board ends you will also need additional joist runs to support the grooved side. If you are raising your subframe off the ground you will also need additional lengths between joists, known as noggins, at least every 1000 mm. For any queries or help working out quantities then please do not hesitate to contact our friendly knowledgeable team. Installation Your decking subframe is the most important part of your composite decking installation as it will fail if not supported sufficiently (every 300 mm) and if there is not enough airflow for moisture to escape from under the subframe. Use our Structural Hexhead Screws to build a solid structural subframe. Terms & Conditions With all orders, as set out in the "Terms and Conditions", on links at the bottom of every page of this website, when you place an order, you are hereby acknowledging that before ordering, you have read, understood and accepted all the terms.
