A rafter is one of a series of sloped structural members (beams) that extend from the ridge or hip to the wall plate, downslope perimeter or eave, and that are designed to support the roof deck and its associated loads.
There are many names for rafters depending on their location, shape, or size (see below). The earliest surviving roofs in Europe are of common rafters on a tie beam, this assembly is technically called a "closed couple". Later principal rafters and common rafters were mixed which is called a a major/minor or primary/secondary roof system. Historically many rafters, including hip rafters, often taper in height 1/5 to 1/6 of there width, the larger end at the foot. Architect George Woodward discusses the purpose of this in 1860: “The same amount of strength can be had with a less amount of lumber. There is an additional labor in sawing such rafters, as well as a different calculation to be made in using up a log to the best advantage.
To calculate the length of the rafters or even show the height of the roof without wasting material?. The pitch?.Is simple just enter the Length of the Gable Wall from the Outer side, enter the wall Thickness, Pitch and the thickness of the Ridge.
- Email all the saved calculations
- clear button to clear all the values which u have given.
- Set up Tolerance
- calculator displays both actual and the tolerance values.