Pre-drilling fixing holes
Temperature change causes expansion and contraction therefore allowance must be made for thermal movement. Pre-drilling is an important step in the installation process to ensure the polycarbonate sheets will have room to expand and contract. Pre-drill fixing holes by at least 5/64” larger than the screw. Polycarbonate sheets can be drilled with any kind of metal power drill at a low speed. Make sure to clamp the sheet to avoid vibrations or movement while operating the drill.