Roof Designs & Construction Calculating a Roof Pitch Architecture I

What is the Roof Pitch? The roof's Pitch is what is called "slope" in geometry Pitch = Rise/Run Run = ½ Span

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 = degrees.

Common Roof Pitches

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

Roof Plan

Sketch the Front Elevation

Roof Pitch & Roof Plan Problem Calculate the roof pitch and sketch the roof plan for the following house: 2 STORY HOUSE2 CAR GARAGE  48’-0”   32’-0”   24’-0”   22’-0” 

Roof Framing Systems Architecture I Fairport High School

Roof Members

Conventional Framed Roof

Wood Trussed Roof

Carpenter Truss Components

Trussed Rafter Components

Trussed Gambrel Components

Flat Roof Truss Components

Truss Types

Cornice Framing Details

Drawing a Cornice Section

Roof Plan

Detailed Roof Framing Plan

Roof Framing Plan Detail

Rafter Spans

Wood Ceiling Joist Spans