Rafters are load-bearing structural members running from roof ridge to walls. They can be constructed from steel or timber and are laid parallel. Rafters must resist wind pressure and provide structural stability
Eaves are roof overhangs that protect homes and create visual impact. Types include closed, open, exposed rafter, box, and abbreviated eaves. Ancient Greeks developed wide overhangs for water protection
Roof tiles have been used since 1600s with slate and clay being popular. Modern materials like concrete and metal tiles emerged in 19th century
Henry Robinson Palmer patented corrugated metallic sheets in 1829. Originally made from wrought iron, later replaced by mild steel. Widely used in rural and military buildings worldwide. Became cultural identity in Australia and New Zealand
Building components are divided into non-structural and structural categories. Structural components bear loads and are essential for building survival
Oldest chassis with two long beams supported by two short beams. Easy to manufacture and assemble but heavy and weak for cornering. Used in vehicles needing heavy towing