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Roof Design

Basic Roof Design Principles

fasciacovers the rafter end enclosing the overhang
lookoutbeam used to supoort eave loads
soffitusually the underside of an overhanging cornice
knee wallwall of less than full height
ceiling joisthorizontal member of the roof which resists outward spread of rafters
collar beamhorizontal ties between rafters near ridge to resist spreading
ridge boardtop horizontal member the aligns rafters to resist downward force
flashingmetal used to prevent water leaking at surface intersections
eavepart of roof that extends out from the wall
hipexterior edge formed by two sloping roof surfaces
ridgetop of roof where two sloping edges meet
roof trussprefabricated member formed of triangular shapes to construct roof
pitchthe angle of the foot that uses rise and run
roof plandrawing in plan view of the roof showing features
dutch hipcombination between hip roof and gable roof
mansardgambrel roof with angled lower roof on all four sides
gambrellower steep pitch connected to upper less pitch on two sides
gableconstructed roof with two sloping sides that meet to form a ridge
shedroof slopes in only one direction
flatroof common in areas with little rain or snow

CTE Instructor
Person High School
Roxboro, NC

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