RAFTER AND ROOF COMPONENT PARTS - PowerPoint PPT Presentation

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RAFTER AND ROOF COMPONENT PARTS

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A gable roof is the more common roof style. 3. These rafters are ... Tail or Soffit Level Line. Bird's Mouth Plumb Line. Bird's Mouth and Tail. 10. Overhang ... – PowerPoint PPT presentation

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Title: RAFTER AND ROOF COMPONENT PARTS


1
Presentation 19
  • RAFTER AND ROOF COMPONENT PARTS

2
Gable Roof
A gable roof is the more common roof style.
3
Gable Roof
These rafters are referred to as COMMON rafters.
A symmetrical triangular shape.
Made with gable rafters, which are all the same.
4
Roof Framing Terms
Span is usually the width of the building.
Terms relating to roof framing include
5
Roof Framing Terms
Run is the horizontal distance under a rafter.
Rise is the total increase in rafter elevation.
In this case it is one-half the span.
6
Rafter Parts
Ridge
Rafter
Rafter Tail
7
Ridge Cut
Ridge Plumb Line
8
Birds Mouth and Tail
Birds Mouth or Seat Cut
9
Birds Mouth and Tail
Birds Mouth Plumb Line
Tail or Fascia Plumb Line
Birds 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 birds mouth plumb
line.
12
Rafter Parts
Unit Rise
Unit Triangle
Has three parts just like the house.
Found on the plans and similar to Total Rise.
13
Rafter Parts
Unit Run
Unit Length
Equal to 12? and similar to Total Run
Similar to Line Length
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.
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