![]() ![]() Length of Rafter depending on climatic condition, style, slope and type of structure. Thickness of rafter should be not less than 2 inches and their depth should be range from 4″ to 12″. Thicker dimensional lumber, such as 2x10s and 2x12s can span further. Most common size of dimensional lumber as roof rafter are 2″×6″, 2″×8″, 2″×10″, 2″×12″ and 2″×14″ used in roof framing. The wider the space between rafters often results in rafters of greater depth too. Depending on all contributing factors though, roof rafters are 16” and 24” far apart, are commonly used for most residential buildings. Standard industry roof rafters spacing are 12”, 16”, 19.2”, and 24” on-center, however other spacing may be used by a Structural Engineer. The rafter which are kept at lower spacing can allow longer distance to span as compared to joist spaced further apart. ![]() Standard spacing between rafter is 400 mm centre to center. Rafter spacing in mm for different sizes are kept at 300mm, 400mm and 600mm apart. Depending on all contributing factors though, 16” and 24” are commonly used for most buildings. Standard industry roof rafter spacing in inches are 12”, 16”, 19.2”, and 24” on-center, which means the actual space between the rafters is 10.5”, 14.5”, 17.7”, and 22.5”. The typical on-center spacing, according to the International Residential Building Code (IRC), is 12”, 16”, 19.2”, and 24”, which means the actual space between the rafters is 10.5”, 14.5”, 17.7”, and 22.5”. ![]()
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