Flying HipĪlso called mystery hip, this element reaches the end of a higher ridge board. In situations when the hip and valley beams are placed close together, cripple jacks are engaged for connection. Valley jacks connect the valley rafter with the ridge board. They are transferring the portion of the weight to the intersecting wall plates, to support the roof's ridge. Placed at inside corners to the ridge, these beams extend diagonally at a 45° angle. Hip jacks sit on the outside walls and extend up to the hip rafter, parallel with the commons. Stretching from the wall plate to the ridge board at a 45-degree angle, hip beams mark the structure's outside corners. A common rafter runs between the wall and the ridge board, determining both the height of the roof and the board location. These are standard elements of most conventionally framed structures. A simple gable roof can be assembled using only the common rafter type, while the addition of hip and hip jack rafters forms a standard hip roof framing.
Typical stick framing roofs consist of three to seven different types of rafters, where more elements mean the more complex structure. Ridge boards share the same width and can be replaced with ridge beams in more demanding systems.Ĭollar ties are installed horizontally to provide additional strength and stability. They are fastened to the ridge board at the roof's apex and the top plate where they join the wall. Rafter boards create the slope of the roof. Such a system can support ranges of up to 12 m with a variety of different pitch angles, enhancing the structural strength of the roof framing. The name comes from tension and compression features added to the beam, forming the shape of a W letter. In modern residential construction, the most common form used is the fink or "W-trussed" rafter. They provide additional strength to the structure, sometimes allowing for lighter and thinner rafters. Purlins are used for maximising potential roof span without compromising the stability or adding extra costs. Structures and building sites that cannot be easily reached.Ī closed couple roof includes roof joists running horizontally to sustain the weight of a ceiling, making the structure more rigid.
Customised additions of vertical space for maximising the home's functionality.The preparation process that is very convenient in some cases, can be a disadvantage in others. On the downside, customised beams are less cost- and labour-effective than roof trusses.