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2. Knee wall - Wikipedia

   en.wikipedia.org/wiki/Knee_wall

   A knee wall is a short wall, typically under three feet (one metre) in height, used to support the rafters in timber roof construction. In his book A Visual Dictionary of Architecture, Francis D. K. Ching defines a knee wall as "a short wall supporting rafters at some intermediate position along their length."

3. Rafter - Wikipedia

   en.wikipedia.org/wiki/Rafter

   Compass rafter: A rafter curved or bowed on the top (the top surface of a rafter is called its "back") or both the top and bottom surfaces. Curb rafter: The upper rafters in a curb (kerb, gambrel, Mansard roof) roof. Hip rafter (angle rafter): The rafter in the corners of a hip roof. The foot of a hip rafter lands on a dragon beam.

4. Domestic roof construction - Wikipedia

   en.wikipedia.org/wiki/Domestic_roof_construction

   Section view through a house roof drawing showing names for parts of the structure. [clarification needed] (UK and Australia). Ctrs. means centers, a typical line to which carpenters layout framing. Domestic roof construction is the framing and roof covering which is found on most detached houses in cold and temperate climates. [1]

5. Timber roof truss - Wikipedia

   en.wikipedia.org/wiki/Timber_roof_truss

   Two king post trusses linked to support a roof. Key:1: ridge beam, 2: purlins, 3: common rafters. This is an example of a "double roof" with principal rafters and common rafters. A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof.

6. Lookout (architecture) - Wikipedia

   en.wikipedia.org/wiki/Lookout_(architecture)

   A lookout, [1] lookout rafter or roof outlooker [2] is a wooden joist that extends in cantilever out from the exterior wall (or wall plate) of a building, supporting the roof sheathing and providing a nailing surface for the fascia boards. When not exposed it serves to fasten the finish materials of the eaves.

7. Speed square - Wikipedia

   en.wikipedia.org/wiki/Speed_square

   Among its basic uses are marking common, hip, valley and hip, or valley jack rafters, laying out stair stringers, determining and marking angles, and making square cuts on boards. Common lines made using a speed square include perpendicular cut marks and Angles definition of an angle for roofs, stairways, and decks. The tool uses a 0° reference.

8. Birdsmouth joint - Wikipedia

   en.wikipedia.org/wiki/Birdsmouth_joint

   A birds-mouth joint in a rafter, set upon a double top plate. Shown are the two cuts of the joint: the seat cut and the heel cut. In light frame construction, a birdsmouth joint or bird's beak cut is a woodworking joint that is generally used to connect a roof rafter to the top plate of a supporting wall. [1]

9. Gable roof - Wikipedia

   en.wikipedia.org/wiki/Gable_roof

   The gable roof [2] is so common because of the simple design of the roof timbers and the rectangular shape of the roof sections. This avoids details which require a great deal of work or cost and which are prone to damage. If the pitch or the rafter lengths of the two roof sections are different, it is described as an 'asymmetrical gable roof'.