1. RAFTER AND ROOF COMPONENT PARTS
Presentation 19:
RAFTER AND ROOF COMPONENT PARTS

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

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

4. Roof Framing Terms Terms relating to roof framing include …
Span is usually the width of the building.
Span

5. Roof Framing Terms Rise is the total increase in rafter elevation.
Run is the horizontal distance under a rafter.
Rise
Run
Span
In this case it is one-half the span.

6. Rafter Parts
Ridge
Rafter
Rafter Tail

7. Ridge Cut
Ridge Plumb Line

8. Bird’s Mouth and Tail
Bird’s Mouth or Seat Cut

9. Bird’s Mouth and Tail Bird’s Mouth Plumb Line
Tail or Fascia Plumb Line
Bird’s Mouth Level Line
Tail or Soffit Level Line

10. Projection vs. Overhang
Always sloping
Overhang
Projection
Always horizontal

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

12. Rafter Parts Unit Triangle U Unit Rise
Total Rise
Unit Triangle
Has three parts just like the house.
Found on the plans and similar to Total Rise.

13. Rafter Parts Unit Run U Unit Length
Line Length U
Unit Length
Equal to 12″ and similar to Total Run
Similar to Line Length
Total Run

14. 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.