Roof FramingRoof FramingUnit 33

Roof FramingRoof FramingRoof Styles

Gable roof with dormerGableHipGable and ValleyGambrelHip and ValleyShed or Lean-toFlatMansardDutch Hip

Roof FramingRoof FramingRoofs 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 FramingRoof FramingArchitectural Design

Has a great relationship with roof styles

Roof Framing ComponentsRoof Framing ComponentsRidge Board

Horizontal member that connects the upper ends of the rafters

Common RafterExtends from the top plate to the

ridge boardValley Rafter

Extends diagonally from the top plate to the ridge board along lines where two roofs intersect

Roof Framing ComponentsRoof Framing ComponentsHip Rafter

Extends diagonally from the corners of the top plate to the ridge board

Hip jack and Valley jack raftersNever extends the full distance from

the top plate to the ridge board

Roof Framing TerminologyRoof Framing TerminologyOverhang

Also called the tail of the rafterSlope

Incline of the roofPitch

Steepness of the roofSpan

Distance between outside edge of the top plates

Roof Framing TerminologyRoof Framing TerminologyUnit 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 RiseNumber of inches the roof rises per foot of

run

Roof Framing TerminologyRoof Framing TerminologyTotal Run

Half the distance of the spanTotal Rise

Vertical distance from the top of the top plate to the upper end of the measuring line

Plumb lineLine that runs vertical to a rafter

Level lineLine that runs level with a rafter

Roof Framing General Roof Framing General KnowledgeKnowledge

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