The area which has heavy rainfall and snowfall require good drainage for roof, roof drainage depending on slope of the roof provided, based on slope of roof it is categorised into two types flat roof and pitched roof or sloping roof. Design and construction of roof is depending on many factors but one of the most common important factor is climatic and weather condition of your surrounding areas, in your cities and countries. Typically, it runs from the ridge or hip of the roof. Rafter size for 10, 12, 15, 16, 18, 20 & 24 foot spanĪ rafter is a structural component that is used as part of a roof construction. 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. Rafters are generally provide in series, side by side, providing a plateform to support roof decks and roof coverings. Rafter runs from the ridge or hip of the roof to the wall plate of the external wall.
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