WPC composite decking board will expand and shrink according to itself characteristics. When install, you should reserve suitable gap, also notice some factors of bottom support joist frame.

Please inquire us for our WPC decking installation instruction before whole deck installation work.

Some Install notice for our 25mm thickness WPC decking board:
* Two joists' center distance is max 400mm;
* Install edge board or edge cover or edge slat to cover the deck four sides;
* Install double joists together at the close place of two individual decking board end;