Roofers, remove old roofing materials, and apply membrane sheeting, or tar or asphalt and gravel to flat roofs. They cut and apply, underlayment, battens, shingles, tiles, and sheet metal to sloped roofs and install flashing, gutters and downspouts. This work involves unloading and transporting material onto roofs, using roofing cement gules and caulk, and erecting and climbing ladders and scaffolds. This database includes hazards of such work and control options for making roofing safer.