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