Traditional Rafter Roof Construction

At the top where the rafters meet they are either angled to meet at a point or attached to a horizontal ridge beam.

Traditional rafter roof construction.

Shown in red in our sketch a common rafter runs at right angles to 90 to the building front and back walls as seen when looking down from above. A cut roof this is the traditional method of cutting the timber on site and building up the roof using rafters ridge boards joists and purlins etc the exact details being determined by the size of roof size of timbers etc. A truss roof using factory made trusses which are delivered to site complete and just erected. There are two basic methods of pitched roof construction.

How do you figure the length and angles of the cuts on an uneven roof for the hip rafter. Roofs are framed in five basic designs. An example of each is shown in figure 2 1. This means that each rafter is built on the job site using dimensional lumber.

Each beam is notched at the bottom called a birdsmouth so that it rests flat on top of each wall. Building with them is known as stick framing. The 4 hip rafters begin at the 4 corners of the roof and connect to the ridge beam. Billy hope this helps you construction master pro calculator example building is 30 wide main roof 12 12 end cap is 8 12 1.

I have a hip roof with a 12 12 pitch on the main side of the roof while the end is an 18 12 pitch. Every piece is measured cut and fastened together to form the rafter. Rafters are the traditional means of framing a roof. The types of rafters used in a hip roof include common jack hip and ridge beam rafters.

Due to the width. Shed gable hip gambrel and mansard. The ridge beam runs along horizontally along the top of the roof and is supported by the other rafters. Definition of common rafter.

Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter. Possibly the most satisfiying part of the roof yet. Piece by piece rafter roof construction however is still the more common construction method for many buildings. A common rafter runs from the roof ridge to the top of the front or rear wall plate and extend beyond the wall to provide an overhang or eaves or soffit.

Simple roofs such as a shed or the common gable are fairly easy to construct even without plans if you understand the basics and a little geometry. A common rafter comprises two beams that extend upwards from the top plate of either side of a shed wall. Ben march 1 2015.