roof designs & construction calculating a roof pitch architecture i
TRANSCRIPT
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Roof Designs & Construction
Calculating a Roof Pitch
Architecture I
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What is the Roof Pitch?
The roof's Pitch is what is called "slope" in geometry
Pitch = Rise/Run Run = ½ Span
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Roof Pitch to Degree Equivalents
This drawing demonstrates how many degrees rise for each pitch of a typical roof. Look at the column labeled pitch, then look under degrees to get the corresponding amount of degrees.
Example;
8/12 pitch = 33.75 degrees.
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Common
Roof Pitches
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Various Roof Pitches
The roof pitch is defined in ranges which can reasonably be determine from field observation without precise measurement.
o Very Low or Flat Roofs are < 1 in 12 pitch
o Low Pitched Roofs are < 4 in 12 pitch
o Medium Pitched Roofs are < 9 in 12 pitch
o Steep Roofs are < 12 in 12 pitch
o Very Steep Roofs are > 12 in 12 pitch
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Roof Plan
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Sketch the Front Elevation
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Roof Pitch & Roof Plan Problem
Calculate the roof pitch and sketch the roof plan for the following house:
2 STORY HOUSE 2 CAR GARAGE
48’-0”
32’
-0”
24’-0”
2
2’-0
”
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Roof Framing Systems
Architecture IFairport High School
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Roof Members
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Conventional Framed Roof
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Wood Trussed Roof
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Carpenter Truss Components
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Trussed Rafter Components
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Trussed Gambrel Components
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Flat Roof Truss Components
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Truss Types
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Cornice Framing Details
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Drawing a Cornice Section
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Roof Plan
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Detailed Roof Framing Plan
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Roof Framing Plan Detail
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Rafter SpansMaximum Span Size
Rafter Spacing Rafter Group 1 Group 2 Group 3 Group 4
12” 10’-0” 9’-0” 7’-0” 4’-0”
16” 9’-0” 7’-6” 6’-0” 3’-6”
24” 7’-6” 6’-6” 5’-0” 3’-0”
2 x 4
32" 6’-6” 5’-6” 4’-0” 2’-6”
12” 17’-6” 15’-0” 12’-6” 9’-0”
16” 15’-6” 13’-0” 11’-0” 8’-0”
24” 12’-6” 11’-0” 9’-0” 6’-6”
2 x 6
32" 11’-0” 9’6” 8’-0” 5’-6”
12” 23’-0” 20’-0” 17’-0” 13’-0”
16” 20’-0” 18’-0” 15’-0” 11’-6”
24” 17’-0” 15’-0” 12’-6” 9’-6”
2 x 8
32" 14’-6” 13’-0” 11’-0” 8’-6”
12” 28’-6” 26’-6” 22’-0” 17’-6”
16” 25’-6” 23’-6” 19’6” 15’-6”
24” 21’-0” 19’-6” 16’-0” 12’-6”
2 x 10
32" 18’-6” 17’-0” 14’-0” 11’-0”
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Wood Ceiling Joist Spans
Maximum Span Size Ceiling J oists
Spacing Ceiling J oists
Wood Group 1
Wood Group 2
Wood Group 3
Wood Group 4
12” 11’-6” 11’-0” 9’-6” 5’-6” 2 x 4 16” 10’-6” 10’-0” 8’-6” 5’-0”
12” 18’-0” 16’-6” 15’-6” 12’-6” 2 x 6 16” 16’-0” 15’-0” 14’-6” 11’-0”
12” 24’-0” 22’-6” 21’-0” 19’-0” 2 x 8 16” 21’-6” 20’-6” 19’-0” 16’-6”