Graphical Construction Glossary >> Roofs and roofing. >> valley rafter
The sketch above shows two valleys in a typical hip roof. They are the ones leading of at 45 Deg. from the internal corners of the building. They follow the same rules as hips in that a valley in (a regular)plan dissects the angle of the walls that it rises from.
In this normal case, the angle of the walls is 270 Deg. so the valleys are set at 135 Deg. from each wall.
Shown in the sketch above is one of the valley timbers running up to the ridge. It is essential that the valley section is connected firmly to the main roof.
Roofs have been built like this for centuries, but they rely for a certain extent on good workmanship by the carpenters. Today the use of timber connectors has improved things strength wise, but this type of construction in my opinion is inherently weak. Scotch valleys are far stronger and simpler to frame.
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