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