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PSTS
Multiple Connections
PSTS Procedure For Designing Connections of Multiple Girder Roof Trusses
Maximum Return Spans of Incoming Trusses For A Range of PSTS 8.0mm Spacings
Table 1 – Maximum Return Spans of Trusses Spanning Onto 2–Ply Girder Trusses
Maximum Return Spans (m) of Incoming Trusses for Paslode STS 8.0mm Spacings (S) of: 100mm 150mm 200mm 300mm 400mm 600mm
Length of Paslode STS 8.0mm
Size of Bottom Chord Members of Girder Truss (mm)
35 x 72, 35 x 84
65mm
N/A
7.1
5.1
3.2
2.2
N/A
35 x 97
65mm
N/A
9.1
6.6
4.2
2.9
1.7
35 x 122, 35 x 147, 35 x 172
65mm
11.0
9.1
6.6
4.2
2.9
1.7
47 x 72, 47 x 84
85mm
N/A
11.6
8.5
5.4
3.9
2.3
47 x 97
85mm
N/A
14.7
10.8
7.0
5.0
3.1
47 x 122, 47 x 147, 47 x 172, 47 x 197, 47 x 220
85mm
15.0
14.7
10.8
7.0
5.0
3.1
Table 2 – Maximum Return Spans of Trusses Spanning Onto 3–Ply Girder Trusses
Maximum Return Spans (m) of Incoming Trusses for Paslode STS 8.0mm Spacings (S) of: 100mm 150mm 200mm 300mm 400mm 600mm
Length of Paslode STS 8.0mm
Size of Bottom Chord Members of Girder Truss (mm)
35 x 72, 35 x 84
100mm
N/A
5.1
3.7
2.2
1.5
N/A
35 x 97
100mm
N/A
6.1
4.8
2.9
2.0
N/A
35 x 122, 35 x 147, 35 x 172
100mm
10.3
6.6
4.8
2.9
2.0
N/A
47 x 72, 47 x 84
135mm
N/A
18.5
6.2
3.9
2.7
1.6
47 x 97
135mm
N/A
10.8
7.9
5.0
3.6
2.1
47 x 122, 47 x 147, 47 x 172, 47 x 197, 47 x 220
135mm
15.0
10.8
7.9
5.0
3.6
2.1
Notes — The return spans of tables 1 & 2 presume that the bottom chords of the girder trusses are strength class TR26 timber — The return spans of tables 1 & 2 presume that the Paslode STS 8.0mm are inserted into the girder trusses in accordance with the fastener layouts of Figures 1–4 — For 44mm thick timbers the tabulated return spans given for 47mm thick timbers may be used — Where plain concrete tiles (maximum top chord deal load of 0.88kN/m² on slope) are used instead of interlocking concrete tiles, then tabulated return spans should be multiplied by 0.9
Design Assumptions
The connection details given are applicable to trusses with pitches between 15º and 45º and supporting the following loadings:
Top Chord Dead Load (kN/m 2 on slope)
0.685
For Pitches ≤30º
0.75
Top Chord Imposed (snow) Load (kN/m 2 plan)
For Pitches >30º
0.75 [(960 – pitch) / 30]
Bottom Chord Dead Load (kN/m 2 )
0.25
Bottom Chord Imposed (storage) Load (kN/m2) – Water Tank Loads as BS5268–3
0.25
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