Transcript Chapter 33
Roof Framing
Unit 33
Roof Framing
Roof Styles
Gable roof with dormer
Gable
Hip
Gable and Valley
Gambrel
Hip and Valley
Shed or Lean-to
Flat
Mansard
Dutch Hip
Roof Framing
Roofs
should……..
Protect the home in all types of weather
Requires a minimum amount of maintenance
Be strong enough to bear the load of snow and
wind
Be anchored to exterior walls
Roof Framing
Architectural
Design
Has a great relationship with roof styles
Roof Framing Components
Ridge
Board
Horizontal member that connects the upper
ends of the rafters
Common
Rafter
Extends from the top plate to the ridge board
Valley
Rafter
Extends diagonally from the top plate to the
ridge board along lines where two roofs
intersect
Roof Framing Components
Hip
Rafter
Extends diagonally from the corners of the top
plate to the ridge board
Hip
jack and Valley jack rafters
Never extends the full distance from the top
plate to the ridge board
Roof Framing Terminology
Overhang
Also called the tail of the rafter
Slope
Incline of the roof
Pitch
Steepness of the roof
Span
Distance between outside edge of the top plates
Roof Framing Terminology
Unit
of Run
Equal to One Foot or 12”
Cut
of a roof (Slope)
The rise in inches and the unit of run (12”)
Measuring
line
Imaginary line that runs lengthwise from the
outside wall to the ridge
Unit
Rise
Number of inches the roof rises per foot of run
Roof Framing Terminology
Total
Run
Half the distance of the span
Total
Rise
Vertical distance from the top of the top plate to
the upper end of the measuring line
Plumb
line
Line that runs vertical to a rafter
Level
line
Line that runs level with a rafter
Roof Framing General Knowledge
Joists
support the floor like rafters support
the roof
Carpenter
should have a roof frame plan to
know what kind of rafters are needed to
frame the roof
Exact
number of rafters can be determined
from the scale drawing