2. Roof Designs & Construction Calculating a Roof Pitch Architecture I

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

4. 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.

5. Common Roof Pitches

6. 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

8. Roof Plan

9. Sketch the Front Elevation

10. 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” 

11. Roof Framing Systems Architecture I Fairport High School

12. Roof Members

13. Conventional Framed Roof

14. Wood Trussed Roof

15. Carpenter Truss Components

16. Trussed Rafter Components

17. Trussed Gambrel Components

18. Flat Roof Truss Components

19. Truss Types

20. Cornice Framing Details

21. Drawing a Cornice Section

22. Roof Plan

23. Detailed Roof Framing Plan

24. Roof Framing Plan Detail

25. Rafter Spans

26. Wood Ceiling Joist Spans