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