How much space should be left between your deck boards?
It is essential to leave a gap of at least 5 mm in width.
This allows boards to expand with changes in temperature, and also enables water and melting snow/ice to drain away.
This gap between boards must not be obstructed.
Similarly, a gap of at least 5 mm must be left between board ends. Do not butt boards whose length exceeds 4 metres.
When butting, we recommend using double joists: SILVADEC® aluminium joists, or joists of width > 70 mm, with single fastening clips.
If none of these options are possible, use butting clips.
The expansion spacer from the packet of clips must be used to maintain these gaps between board ends.
A gap of at least 15 mm in width and length must be left between a board or joist and any wall(s).
For more information, take a look at PU7