1 Presentation 19: RAFTER AND ROOF COMPONENT PARTS

2 Gable Roof A gable roof is the more common roof style.

3 These rafters are referred to as COMMON rafters. A symmetrical triangular shape. Made with gable rafters, which are all the same. Gable Roof

4 Run is the horizontal distance under a rafter. Roof Framing Terms Terms relating to roof framing include … Span Span is usually the width of the building. Rise is the total increase in rafter elevation. Rise In this case it is one- half the span. Run

5 RafterRidge Rafter Parts Rafter Tail

6 Ridge Plumb Line Ridge Cut

7 Bird’s Mouth Level Line Tail or Fascia Plumb Line Tail or Soffit Level Line Bird’s Mouth or Seat Cut Bird’s Mouth Plumb Line Bird’s Mouth and Tail

8 Overhang Always sloping Projection vs. Overhang Projection Always horizontal

9 Rafter or Line Length - from the ridge plumb line to bird’s mouth plumb line. Rafter Parts

10 Found on the plans and similar to Total Rise. Similar to Line Length Unit Triangle Has three parts just like the house. Rafter Parts U Unit RiseUnit Run Equal to 12″ and similar to Total Run Unit Length Total Rise Total Run Line Length

11 Conclusions Gable rafters are called common rafters. Rafters have many component names. Rise, run, and length are terms used to define parts of a rafter. Unit triangle is similar to the house triangle.