Putting theory to the test in the real world

COMPOUND JOINTS

    The trigonometry and linear algebra used to solve the angles for the compound joints shown below is explained in the section COMPOUND JOINERY .

Interlocking Trusses

Overview of interlocking trusses

Four-branch Convergent Joint
Ridge detail ... two 8/12 rafters meet two beams


Detail at backed ridge lines

Four-branch Convergent Joint .. matching faces

Detail at matching faces

Bird's-eye view of Atrium

Bird's-eye view of Atrium

Atrium detail: Three-branch Convergent Joint
5 21/32/12 Hip rafter meets two beams


Atrium detail: Hip rafter intersects Beams

TIMBER FRAMED ROOF

    ANGLE CALCULATORS contains a link to the Excel worksheet Log Angle Generator, and online calculators LAG and Lag , which will generate the angles for the joinery depicted below.

Equal 10/12 pitches, cruciform footprint

Bird's-eye view of Timber Framed Roof

Interior View: Four 7 1/16/12 Valley rafters
meet the ridges at the center post


Timber framed roof joinery details

LOG ROOF SYSTEMS

9/12 Main pitch intersects 7 1/4/12 Adjacent pitch
90 angle between ridge lines


Overview of Log Roof
Overview of Log Roof

Gazebo: 8/12 pitches, regular octagonal (135) footprint
73/8/12 Hip rafters meet kingpost


Gazebo ... 8/12 slopes, regular octagonal footprint

    There is no valley rafter in the roof below, the valley line is created by intercepting ridges and purlins. The strength of these roof components was assessed using the mathematics described in LOG BEAM SECTIONS , implemented in the Excel worksheet Log Beam Calculator .

Log gable ends

Photos courtesy of
JOHN DEVRIES LOG HOMES

Go to PHOTO GALLERY 2
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