There are design limitations with this manual, and they are listed below. Any plan or design, which is outside these design limitations, should have appropriate design and component criteria evaluated by Palmer Steel Frame & Truss. It is advised that regional wind ratings be checked with your local council if there is any doubt.
Truss Span less than or equal to 15m
Stud Type stiffened flange “dovetail” wall studs
Tiled or Sheet Roof
2400mm; 2700mm; 3000mm
W28; W33; W41N
4.8 x 11 Steel shank Steel stem Rivets
DESIGN & TESTING DETAILS
Stud capacities have been
determined from engineering testing
Studs are designed to carry full wind load and gravity
loads on external walls
The maximum unsupported roof overhang is assumed to be
1000mm and raked, unless otherwise stated
2400mm and 2700mm load-bearing wall heights are to have one
row of nogging at mid height
3000mm load-bearing heights are to have two rows of nogging
at 1200mm minimum spacing
The number of clinches or screws required for each joint
will be noted appropriately
Note: Where clinch joints are used, Palmer Steel Frame & Truss Steel Frames & Trusses will ensure that the appearance and width of the clinches are in accordance with all relevant Codes and Standards
Roof Truss System:
Scope of design:
pitch range for Sheet Roof trusses is 150 – 300.
The pitch range for Tile Roof trusses is 160 – 300.
Truss Spacing for tiled roofs shall be max 600mm. Truss spacing for sheet
roofs shall be max of 1200mm.
every case the top and bottom chords are constructed from boxed
90mmx38mmx.75mm cold-formed section riveted together at maximum 600 centres on
both of the 38mm sides. Rivets shall be 4.8 dia x 11mm Steel rivet.
all web, knee joint and apex bolts, 12mm flange bolts will be used.
For each type of truss the cutting length of the bottom chord is equal to the specified span, including the thickness of the supporting walls. Cutting length for the top chord is the tabulated rafter length plus an allowance for eave overhang. Tabulated lengths of web members are calculated on the bases of a knee height of 105mm. Minor adjustments may be required to the cutting lengths of web members if this knee height is varied.
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