We have many different sized decking joists ranging from 50mm x 47mm to our 200mm x 47mm joist. The joist it the decking frame attached to the post or rested on the ground to support your decking boards. the size of the joist you need all depends on how much weight is placed on the deck and how high off the ground you are all our decking joists come in different lengths with our length joist being 4.8 meters. at Manningham Concrete we deliver throughout West Yorkshire to Bradford, Halifax, and Leeds. If you require delivery outside of our radius, simply submit an enquiry using the form at checkout.