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  • Home
  • About
  • Contact
  • Blog
  • Store
  • Calculator Apps
    • General Construction Calculators >
      • Running Measurement calculator
      • Spacing Calculations (Premium Content)
  • Premium Content pages
  • Construct Pitched Roof
    • Roof Terms
    • Roof Calculations >
      • Roof Bevels >
        • Roof Bevel Generator (Premium content)
      • Roof Quantities
      • Rafter lengths >
        • Rafter Length Calculator (Premium content)
  • Construct Eaves
    • Eave Types
    • Eave Construction methods >
      • Eave Components
    • Eave Calculations >
      • Eave Quantities >
        • Storm Mould Calculations
        • Fascia Calculations (Premium Content)
        • Eave Bearer Calculation (Premium Content)
        • Soffit Sheet Calculation (Premium Content)
      • Eave Drop Off >
        • Eave Drop Off Calculator (Premium content)
    • Setting out Eaves
    • Installing Fascia
  • Demolition
    • Masonry Mass Calculations (Premium Content)
  • Scaffold
    • Scaffold Calculations >
      • Scaffold Quantity (Premium Content)
      • Scaffold Soleplate Calculation (Premium Content)
      • Load Table Calculations (Premium Content)
  • Test page

Roof Terms

Roof Terms Glossary

​Birdsmouth - a small 90 Degree check out of the Rafters where the Rafter sits on top of the frame, the Birdsmouth allows the Rafter to have a sound "Bearing" on the Top-plate of the frame

Half Span - is half of the Span and for a standard pitched roof will be directly under the centre of the Ridge

Pitch - The term used to describe the angle of the roof, usually expressed in "Degree's" i.e. 30 Degree Pitch roof

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Pitch Ratio - another way of expressing the angle of the roof, an example would be expressed as 1.000 : 1.500 and means for ever 1 metre the roof rises vertically the roof half span will be 1.5 metres

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Rafter Foot or Feet - this is where the Rafter sits on top of the wall frame, it is the location of the "Birdsmouth" this is where the Rafter is fixed to the Top-plate of the frame, and to the Ceiling Joists if the roof is a "coupled roof"

Rafter "Left On" dimension - this is the distance measured vertically along the "Plumb" Line at the "Birdsmouth",and  from the "Level" Line of the "Birdsmouth" to the point where the plumb line of the "Birdsmouth" intersects the top of the Rafter

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Rise per metre Run - is another way of describing the angle of the roof, it is usually indicated as "Rise/m Run", an example would be expressed as 0.500m Rise/m Run meaning for every 1 metre of Run the roof Rises 0.500 metre's

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Run - is the way of expressing horizontal distance in relation to roof members, it is always a measurement that is measured "Square" off the external frame no matter what roof member it relates too.

Span - is the overall width of the frame that the roof relates to, and is measured horizontally across the building from outside of frame to outside of frame

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Note: the definitions for all roof members can be found in the appropriate Australian Standard, it is highly recommended that if you are considering constructing a Pitched Roof that you obtain a copy for reference.
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