on and slight expansion allowance- use standard woodworking tools to cut, screw and nail- maintenance free, moist and corrosion resistance, no need repainting- protective film to avoid surface scratches and stains before installed- 30 years factory warranty on aging resistance and color changingPVC Roof Panel Technical Date Specification (W×T)237mm×7mmStandard Weight1.85 kg/mStandard ColorWhite / OakShore Hardness Test72 HDVicat Softening Point70 °CDimensional Shrinkagevertical +1.9% / horizo