The recommendations for waling plate depth and fixing methods have been determined based on the following criteria:

  • Maximum dutch hip girder station 3600mm.
  • Maximum roof pitch 35 degrees.
  • Maximum truss centres 1200mm.
  • Jack truss overhang plus cantilever not exceeding jack truss back span.
  • Girder and waling plate to be designed using Multinail Software with a web layout similar to that selected from the following table.
  • Minimum waling plate thickness to be 35mm.
Truss web layoutMaximum truss span (mm)
Queenpost 5000
A Type 8500
B Type 12000
C Type 16000

NOTES

  1. The fixing method of the waling plate to the dutch hip girder will generally determine the waling plate depth. Refer to Tables 1, 2, 3 or 4 to select the waling plate depth and fixing details.
  2. The truss chords MUST be a minimum of 90mm deep and webs a minimum of 70mm deep UNLESS noted otherwise in the following fixing recommendations.
  3. Joint groups as shown are for BOTH waling plate and truss members.
  4. Engineering fixings may be individually designed for other specific cases.
  5. Truss webbing types and span limits above relate to the fixing of waling plates only and does not refer to the maximum load carrying capacity of the truss itself.

Figure C2-03-01-13

Legend

  • MNGT Multinail Green Tip Screw
  • MNBT Multinail Black Tip Screw
  • M10 10Ø Bolt
  • M12 12Ø Bolt
  • M16 16Ø Bolt

TABLE 1: Wind speed N1, N2 ,N3

DHG station (mm)Steel sheet roofConcrete tile roof
Waling plate depthFixing to chords and websWaling plate depthFixing to chords and webs
1800 90 3 Nails
1/MNGT
1/MNBT
1/M10
90 3 Nails
1/MNGT
1/MNBT
1/M10
2400 120
90
90
4 Nails
1/MNGT
1/MNBT
1/M10
120
120
120
90
4 Nails
2/MNGT
2/MNBT
1/M12
3000 120
120
90
90
4 Nails
2/MNGT
1/MNBT
1/M10
140
120
140
140
3/MNGT
2/MNBT
2/M12
1/M16
3600 120
120
90
2/MNGT
2/MNBT
1/M12
140 3/MNBT
2/MN12

TABLE 2: Wind speed N4, C1

DHG station (mm)Steel sheet roofConcrete tile roof
Waling plate depthFixing to chords and websWaling plate depthFixing to chords and webs
1800 90 1/MNGT
1/MNBT
1/M10
90 3 Nails
1/MNGT
1/MNBT
1/M10
2400 120
120
90
2/MNGT
2/MNBT
1/M12
120
120
90
2/MNGT
2/MNBT
1/M12
3000 120
120
90
2/MNGT
2/MNBT
1/M12
140
120
140
140
3/MNGT
2/MNBT
2/M12
1/M16
3600 140 3/MNGT
3/MNBT
2/M12
140 3/MNBT
2/MN12

TABLE 3: Wind speed C2

DHG station (mm)Steel sheet roofConcrete tile roof
Waling plate depthFixing to chords and websWaling plate depthFixing to chords and webs
1800 120
90
90
2/MNGT
1/MNBT
1/M10
90 1/MNGT
1/MNBT
1/M10
2400 120
120
140
2/MNGT
2/MNBT
2/M12
120
120
90
2/MNGT
2/MNBT
1/M12
3000 140 3/MNGT
3/MNBT
2/M12
140
120
140
140
3/MNGT
2/MNBT
2/M12
1/M16
3600 140 2/M12 140 3/MNBT
2/M12

TABLE 4: Wind speed C3

DHG station (mm)Steel sheet roofConcrete tile roof
Waling plate depthFixing to chords and websWaling plate depthFixing to chords and webs
1800 120
120
90
2/MNGT
2/MNBT
1/M12
90 1/MNGT
1/MNBT
1/M10
2400 140 3/MNGT
3/MNBT
2/M12
140 3/MNGT
3/MNBT
2/M12
3000 190 3/M12 140 2/M12
3600 190 2/M12 140 3/MNBT
2/M12

Waling plate fixed with 3/75mm x 3.05 Ø nails per member.

Figure C2-03-01-12

Waling plate fixed with 3/75mm x 3.05 Ø nails per member.

Figure C2-03-01-02

Waling plate fixed with 4/75mm x 3.05 Ø nails per member.

Figure C2-03-01-04

Waling plate fixed with 6/75mm x 3.05 Ø nails per member.

Figure C2-03-01-03

 Multinail Green Tip Screws D=5.6mmMultinail Black Tip Screws D=6.3 mm
End distance 10D 56mm 63mm
Edge distance 5D 28mm 32mm
Spacing along grain 10D 56mm 63mm
Spacing across grain 3D 17mm 19mm

2/MNGT or 2/MNBT with 90mm web and 90mm Waling plate

Figure C2-03-01-07

2/MNGT or 2/MNBT with 70mm web and 120mm Waling plate

Figure C2-03-01-08

3/MNGT or 3/MNBT with 70mm web and 140mm Waling plate

Figure C2-03-01-09

2/MNGT or 2/MNBT 120mm Waling plate

Figure C2-03-01-10

3/MNGT or 3/MNBT 140mm Waling plate

Figure C2-03-01-11

Waling plate fixed with one bolt per member.

Figure C2-03-01-05

Waling plate fixed with two bolt per member.

Figure C2-03-01-06

Washers required for bolts as per AS1720.1
Bolt dia. Thickness Circular washer Square washer
M10 2.5mm 45mm 40mm
M12 3.0mm 55mm 50mm
M16 4.0mm 65mm 57mm