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A hipped roof is any that has sloping roof surfaces instead
of upright gable sections
have been "common"
rafters that run from the
wall plate to the ridge
board. With hipped roof
designs there are also
"Hip" and "Valley" rafters
that form the external
and internal "corners" of
the roof, plus a number
of "Jack" rafters. Jack
rafters are ones that
have one end (or both)
that does not meet a wall
plate or ridge beam.
There are a few new terms introduced, especially with the rafters.
Until now all rafters shown have been "common" rafters shown
The term Gable refers to the vertical wall that is bounded by
two planes of a sloping roof.
The term Gable as an adjective can also refer to a type of roof,
commonly called a Gable Roof, but also known as a Pitched Roof.
A roof is considered a Gable Roof if both ends have a Gable wall,
if each roof plane is pitched at approximately the same pitch,
and if the roof planes are flat, without a change in direction.
A Gable Roof with significantly different roof plane pitches might
be considered a salt box roof.
A Gable Roof where one part
of the roof planes at a steeper
pitch than the other might be
considered a gambrel roof.
A truss roof design has W shaped wood trusses. Trusses tie
both loft floor and roof. Attic trusses occupy the central loft
space and have to be replaced with steel beams during all
trussed loft conversions. Modifying the trussed rafters
themselves is not possible as trusses have structural integrity.
The exact design of the roof trusses may depend on the age
of your house as shapes,
designs and construction
techniques have evolved over
time. However, UK houses
generally have used
prefabricated (prefab.) roof
trusses which are identifiable
by a W shape and nail plates.