Roof rafter help distribute the load of a structure.
So, 12 inches, and 24 inches apart on centre are also used. Most standard, roof rafter spacing is 16 inches apart on center, but this can vary depending on building codes and the requirements of the structure. Generally span is distance between two support end. In this article you know about Rafter size for 10 foot, 12 foot, 15 foot, 16 foot & 18 foot span that will help you in better understanding and to figure out or estimate of rafter size and their depth according to span. It is used over brick external wall, wall plate, over two support and over top of beam.ĪLSO READ – What size header for 3, 4, 5, 6, 7, 8, 10 and 12 foot span 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. What size lumber for roof rafters:- most common size of dimensional lumber for roof rafters are 2″×6″, 2″×8″, 2″×10″, 2″×12″ and 2″×14″ used in roof framing.
In US, most wood rafters have maximum length of 20 feet. Rafters are usually made of pine or cedar tree, for longer span rafters, building materials several manufacturers have created Laminated veneer lumber (LVL) rafters that can be 2–5 times longer than typical wood rafter. Many species of wood are used to provide timber which have much strength. In many countries such as in US, Canada United Kingdom roof rafter made of wood/ timber are much common to build a house.
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