PROFILE SHEETS/ CORRUGATED SHEETS / TRAPEZOIDAL SHEETS / TILE PROFILE SHEETS TRAPEZOIDAL SHEETS (Box profile sheets) : They are universally popular, in different colors. PPGI (Prepainted GI), PPAL (Prepainted Aluminum), PPAZ (Prepainted Aluzinc) materials. In certain cases, Mill Finish version profile sheets are also offered. The profiles are easy to install with an overlapping system which prevents any leaking and gives protection from the elements. Curves, Ridge Caps, Flashing and Angles required for the installation of these sheets are also offered.