Erecting Roof Trusses - Gable

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Erecting Roof Trusses - Gable
Try and think of the procedure as you go through
these slides, each click of the mouse will reveal
the next point and / or picture

• Mark out truss positions on the wall frame top
  plates.
• Lift trusses onto wall frames and position them
  where they can be retrieved for erection.

M. S. Martin Oct. 2007
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• Start with a gable or raking truss at each end,
  align the heal of the truss with the outside of
  the wall plate.
• Erect and attach temporary braces to each end
  truss, ensure they are plumb secure.
• Attach a taught string line to the apex of the
  gable trusses

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• One by one place each truss into position, use a
  gauge rod for correct spacings
• These days mitek make a proprietary spacer.
• Fix a temporary batten across the top for
  stability
• Check trusses are plumb and straight, fix
  temporary braces and ties as necessary

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• The heal position of each truss is now fixed to
  the top plate with a metal connector, similar to
  a tripple grip.
• Alternatively you can use a truss saddle, see
  bottom picture.
• Ensure all nailing meets specifications

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• Note The gable end or raking truss have their
  top chords set one chord lower that a standard
  truss, to allow for outriggers verge trimmers.
  See picture opposite.

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• Ensure that the bottom chords of trusses, fly
  over internal walls (non-load bearing). Minimum
  gap here is 12mm

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• Add trimmers for any skylights
• Fix bracing as per specification, fixing
  bracing guidelines are also readily available

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• Lastly permanent bottom chord bracing is put in
  place, in the way of longditudinal braces

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Erecting Roof Trusses - Hip

• Mark out wall plates to suit hipped roof.
• Ensure correct number of trusses and types have
  been delivered.
• Check
• Individual trusses are identified
• The number of each are counted
• Types number checked against layout plan

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• Use the layout plan to determine the station
  position of the truncated girder truss at each
  end.
• Erect and brace in position the heals at the
  pitching points
• Place braces in the centre and ends to keep it
  plumb and in wind.

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• Erect the first standard truss, which would be
  placed at ½ span position.
• Tack on space batten to hold top chord and truss
  plumb.
• Nail off the heal to the top plate.

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• Fit permanent bracing members to hip ends, using
  jack or creeper trusses or stick timber
• Erect the remaining standard trusses between the
  hip ends to a string line.
• Using spacer battens tacked on to the top chords
  to hold them plumb in position.
• Nail off heals of trusses.

Remember proprietry spacer
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• Use truss layout plan to erect any remaining
  members
• Install permanent bracing and attach all patent
  metal connectors.