Working point：
1.Plastic wood interstice must be left 5mm, all have to interval between the plastic wood. The 1200 mm installing can be extended life.
2.Aluminum solid joist must be interval between the two left of 30 cm.
3.Do not soak the water before installing of plastic wood.
4.The screws must be vertical locked between the two joists and line up each fastener with 30mm.
5.Do not directly lock tapping screws on the plastic wood that need reaming before.