A roofer's supply typically includes tarpaper, nails, SLATES, TAR, and pinetar. Tarpaper is a heavy-duty paper used as a waterproofing material, and it usually has a TAR coating on one side. Nails are used to secure the tarpaper and other materials to the roof. SLATES are thin pieces of stone or ceramic used to cover roofs. TAR is a thick, sticky substance made from coal, wood, or petroleum that is used to seal roofs. Pinetar is a type of TAR made from pine resin and is often used to seal roofs. All of these items are essential for a roofer's supply.