Preparing the area
If the foundation is already made from concrete or the existing space that is perfect for a robust foundation. Get some chalk and outline the area you wish to build your composite decking
If laying the deck over grass or soil, mark out the area and dig out to a depth of 50mm. Cover the ground with weed control fabric and add gravel. Also we have a full guide on how to lay composite decking on grass
Assembling the frame
Make sure the joists are measured and cut to length ideally you want joists to be equivalent to the area you want your decking to go.
Align the joist into position but with enough room to be able to secure the screws. So you wan tto make sure you have enough room to tighten the screws.
To join the frame at each corner, make sure the corners are all level. Then, mark and drill pilot holes before using two 150mm timber drive screws at each end
Once the frame is secure make sure it is at the correct level if you want to raise it more or set it lower.
Assembling the inner frame
The positioning of your internal joists will be dependent on the decking design you have chosen.
Measure and mark out the positioning. Once you know how many internal joists you need, measure, and cut accordingly.
Mark two holes, one 40mm from the top and one 40mm from the bottom. Drill the pilot holes using a 6mm wood drill bit.
Line the joist up with your spacer mark, ensuring it is flush with the exterior frame.
Line the joist up with your spacer mark, ensuring it is flush with the exterior frame and secure with 100mm timber drive screws.
Once all the internal joists are in place, add the final 30mm screws to each joist hanger.
Measure out and prepare enough noggings so that the distance between them never exceeds 1200mm.
Secure the noggings with 100mm timber drive screws.
Laying your deck boards
If there is no overhang or you have a fixed deck, start by fitting starter clips along the outside of the frame and secure with screws.
With the first board in position, slide the hidden fastener clip into place so it sits within the groove of the deck board. These fasteners help secure the boards and ensure a consistent 6mm expansion gap.
Tighten the clip until it is secure.
Put the next board into position so that the fastener clips sit within the groove. Repeat the process so there is a fastener clip at every joist.
Finish tightening the screws in your first row, and do not over tighten. Repeat the process of securing the previous row once the next board is in position. Then finish off by securing the final board the same way you did the first.
Secure the fascia in place with 63mm colour coded composite decking screws.