What Gap Do You Need Between Decking Boards

Proper wood deck board spacing should have at least a 1/8 inch gap after the decking has dried out. If you install your wood or treated deck boards while they are still wet boards, then they should be attached without a gap between them.

What is the gap between decking boards UK?

You need an expansion gap of 5-8mm between the boards. If you are going to build your decking next to a house then make sure it’s 150mm below the damp-proof course and that you don’t cover any air bricks. Try to plan your deck to fit only whole boards, to avoid having to awkwardly cut a board lengthways to fill a gap.

Can I use 4x2 for decking frame?

4 x 2 Timber Rail / Joist These decking joists are the most common sized framing timber for decking. They provide a solid structure for fixing your decking boards too. When making your decking frame you should use a 400mm spacing between your timber joists.