... forest resources, it meets the trend of saving the earth.UV-protected, anti-mildew, anti-freezing and cracking, anti-slip ,flame ... by screwing to form a frame, the recommended gap between two joists is 12” to 14”, the joist can be wpc ... CE, FSC certified, passed ROHS, SGS, CTI test Project example UV-protected Anti-freezing Anti-slip outdoor wpc decking