Whilst you might have given a great deal of thought to your choice of deck boards and other elements such as balustrades, fixings and lighting, you might not have thought about deck joists in the substructure.
Whilst these bits of timber cannot be seen once your deck is complete, they are perhaps more important than your deck boards! Deck joists give you the framework to attach your timber decking boards to and play a very important part in ascertaining the strength and durability of your decking. If you skimp on this part of the project you stand to compromise its service life, regardless of the quality of the deck boards. You can also create a safety issue and so it is important to get it right.