... ,advertising, Display Design;3-Sound insulation wall for expressway, environment;4-Roofing/wall for agricultrure greenhouse,garden, plant and cultivate;5- ... installation is completed. · Drilling and fixed:If use self drilling screws for fixing,the hole must be pre-drilled,the aperture ... diamenter of the screw,it is suggested to use roof hook for fixing.Do not tighten the screw strongly,otherwise stress ...