![]() Types of Rafters Principal Rafter/ Major Rafter The rafters, tie beams, and plates transfer the weight of the roof to the building’s walls. Tie beams, which can also function as ceiling joists, are generally attached between the lower ends of opposing rafters to keep them from expanding and pushing the walls apart.Ĭollar beams or collar ties can be installed higher up between opposing rafters for added strength. To support larger rafter spans, heavier under purlins or purlin plates are used. The upper ends of the rafters usually meet at a ridge beam, but they can butt straight to another rafter to form a couple of rafters.ĭepending on the roof covering material, horizontal laths, battens, or purlins are attached to the rafters, or boards, plywood, or oriented strand board form the roof deck (also known as sheeting or sheathing) to support the roof covering. Construction of a Rafter RoofĪ simple rafter roof is made up of rafters that rest on horizontal wall plates on top of each wall. Rafters are traditionally constructed of wood, but may be constructed of other materials such as steel, aluminum, or plastic.Ī rafter can be reinforced with a strut, principal purlin, collar beam, or, rarely, an auxiliary rafter. They provide additional support to the roof framing and can be used for loads bearing. If there is a collar beam, it will be made of 2×6 or 2×8 boards. The roof rafters are usually made from a lot of 2x4s. They also have the support of a collar beam on each side. ![]() The roof rafters are then connected to the wall frames on either side with a tie beam at the end. The rafters connect to each other, and in some cases, they make a triangle with a ridgeboard. Some historic roof types include exposed rafters. Rafters are typically built of wood in home construction. These triangular shapes are put together in a skeleton frame to make the roof.Ī couple is a pair of rafters. They are bits of wood that are shaped in a triangular pattern. These rafters are placed at an angle to the wall and secured with nails to the top of the wall. Rafters are the long, diagonal pieces of lumber used to create a roof.
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