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Roof Framing
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Terms in this set (18)
Flat
Has a minimum slop of 1/4" per foot of run
Shed/Lean-to
Simplest to construct
Gable Roof
Has a ridge at the center and sloped in two directions.
Commonly used due to the simplicity of design and ease of construction
Hip
Four sloping sides from a central point or ridge
Strongest type of roof but more difficult to construct
Intersecting
Consists of gable and a valley or hip and valley or any combination of things
The 2 different sections of roof meet
The valley is formed where
Other type of roofs
Butterfly, gambrel, mansard, and continuous-slope gable
Gable
The basic roof frame
Span
distance between the outside top plates; same as the base of two right triangles
Unit of span
Fixed unit of measure equal to twice the unit of run or 24"
Totally run
half the span
Unit of Run
Fixed unit of measure which is always equal to 12" on a common rafter
Total Rise
Vertical distance from the top plate to the top of the ridge
Unit of rise
The distance the rafters rise per foot
Line length
Distance along the rafter from the outside edge of the top plate to the centerline of the ridge
Bridge Measure
The length of the hypotenuse of a right triangle with the outer sides equal to the unit of run and unit of rise
Pitch
Ratio of the unit of rise to the unit of span, expressed as a fraction
Cut/Slope
Angle that the roof surface makes with a horizontal plane
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