PURLINS STRUCTURAL
PRODUCT INFORMATION
HST TOPHATS
CODE
OCT 2014
PRODUCT INFORMATION HST TOPHATS
PURLINS STRUCTURAL PRODUCTS
A versatile and easy to use structural product. Steel & Tube HST Tophat sections are an economical, lightweight, versatile and easy to use product for roof purlins, wall girts, floor joists, and hundreds of other applications such as fencing, carports, racking etc. Generally, for spans from 3m to 7m, HST Tophat purlins will provide an economical alternative to timber and Cee section purlins. Tophat purlins are easy to use, being fastened directly to their supports, results in a saving on cleats. The symmetrical section means no braces or nogs are required to prevent twisting and the profile is easily lapped for optimal performance.
DOUBLE SPAN
DURABILITY HST Tophat purlins are manufactured from hot dipped galvanised steel with a coating weight of 275gram/sqm, in line with other common lightweight steel structural building products. This gives good protection in most exposed internal environments, and for external use in moderate environments. Where used in a lined exterior dwelling a thermal break should be provided between the Tophat and the cladding to avoid thermal bridging. Where sections are exposed to salt spray but not rain washing, maintenance is required to remove any build up of salt deposits on the surface.
SINGLE SPAN
Run off from, or contact with, materials which are incompatible with zinc should be avoided.
HANDLING AND STORAGE HST Tophat sections must be kept dry during storage as water present between close stacked sections will cause premature corrosion. If they become wet they should be separated and stacked openly to allow for ventilation to dry the surface.
DOUBLE SPAN
LENGTHS HST Tophat sections are available in long run lengths up to 12 metres, depending on the available transport and handling facilities.
CUTTING Cutting is preferably done by shear or hacksaw. When using abrasive disc blades care must be taken to ensure the swarf produced does not affect other materials and the burred edge should be cleaned off at the completion of cutting.
LAPPED SPAN
Minimum lap (between fasteners) = 15% of TopHat span 2
HST TOPHATS PRODUCT UPDATE
HST TOPHATS DESIGN CAPACITY TABLES HST TOPHAT SECTIONAL PROPERTIES
TOPHAT SECTION
THICKNESS t(BMT)
AREA
MASS PER UNIT LENGTH
mm
mm2
kg/m
SECOND MOMENT AREA (FULL) lX lY
CENTRE OF SECTION MODULUS GRAVITY (FULL) YC ZX ZY
106mm4
106mm4
mm
RADIUS OF GYRATION rX rY
MONOSHEAR TORSION WARPING SYMMETRY CENTRE CONSTANT CONSTANT CONSTANT YE J lW BX
103mm3
103mm3
mm
mm
mm
mm4
109mm6
mm
60 HST Tophat 0.75 BMT
0.75
150
1.18
0.078
0.119
31.7
2.45
2.20
22.8
28.1
44.2
28.2
16.05
110
60 HST Tophat 0.95 BMT
0.95
190
1.50
0.098
0.151
31.7
3.09
2.78
22.8
28.1
44.2
57.3
20.33
110
100 HST Tophat 0.75 BMT
0.75
248
1.93
0.338
0.439
55.2
6.3
5.39
37.1
42.2
67.4
46.5
238.61
158
100 HST Tophat 0.95 BMT
0.95
314
2.45
0.428
0.556
55.2
7.75
6.83
37.0
42.2
67.4
94.5
302.24
158
120 HST Tophat 0.75 BMT
0.75
278
2.17
0.527
0.519
65.6
8.03
6.13
43.7
43.3
82.3
52.1
363.31
184
120 HST Tophat 0.95 BMT
0.95
352
2.75
0.667
0.657
65.6
10.16
7.76
43.6
43.3
82.3
105.9
460.20
184
150 HST Tophat 0.95 BMT
0.95
410
3.21
1.16
0.878
81.1
14.30
9.60
53.3
46.3
103.9
123.5
758.37
225
150 HST Tophat 1.15 BMT
1.15
497
3.88
1.40
1.06
81.1
17.30
11.62
53.2
46.3
103.9
219.1
918.02
225
TYPICAL HST TOPHAT PURLIN SPANS (MM) REGION 1
PURLIN SPACINGS
60 HST Tophat 0.75 BMT
60 HST Tophat 0.95 BMT
100 HST Tophat 0.75 BMT
100 HST Tophat 0.95 BMT
120 HST Tophat 0.75 BMT
120 HST Tophat 0.95 BMT
150 HST Tophat 0.95 BMT
150 HST Tophat 1.15 BMT
URBAN
RURAL
REGION 2 SECONDARY USE
URBAN
RURAL
SECONDARY USE
(MM)
SIMPLE
LAPPED
SIMPLE
LAPPED
SIMPLE
LAPPED
SIMPLE
LAPPED
SIMPLE
LAPPED
SIMPLE
LAPPED
1200
2200
2800
2000
2600
2600
3200
2100
2700
1900
2500
2500
3200
1800
1800
2400
1700
2300
2100
2700
1800
2300
1700
2200
1900
2500
1200
2300
3000
2200
2900
2700
3600
2300
3100
2100
2700
2700
3600
1800
2000
2700
1900
2500
2400
3100
2000
2600
1800
2400
2300
2900
1200
3600
4600
3200
4200
3600
5400
3400
4400
3000
4000
3400
4800
1800
3200
4000
3000
3700
3800
4600
3000
3800
2800
3600
3600
4000
1200
4000
5000
3700
4700
4300
5400
3800
4800
3600
4500
4000
5800
1800
3500
4400
3200
4100
3600
5000
3400
4200
2900
4000
3400
4800
1200
4300
5400
4000
5000
5100
6000
4200
5200
3900
4800
4900
5800
1800
3400
4800
3000
4400
3400
5300
3200
4500
2800
4200
3200
4900
1200
4800
6000
4400
5600
5100
6300
4600
5600
4200
5400
4800
6200
1800
4200
5200
3800
4900
5000
5800
4000
5000
3700
4600
4400
5600
1200
5600
70000
5000
6600
5600
8000
5200
6800
4800
6400
5200
7800
1800
4600
6200
4100
5800
4600
6800
4200
6000
3900
5500
4200
6600
1200
5100
7700
5700
7200
7000
8000
5800
7400
5200
6900
6200
8000
1800
5000
6800
4800
6300
5000
7800
5000
6500
4600
5500
5000
6800
PERFORMANCE The Typical Spans are designed to give information for preliminary design and costings and are based on the factors noted. Full design Load Tables are available for specific design and Building Consent purposes.
Notes: REGION 1
Auckland, Central North Island, South Island (except Marlborough & Southland).
REGION 2
Northland, Wellington, Marlborough, Southland.
URBAN
Any Built up area with numerous houses/buildings 3 to 5 metres high (Terrain Category 3).
RURAL
Areas with scattered obstructions, hedges, trees, buildings etc. (Terrain Category 2 1/2).
SECONDARY USE
Buildings of low importance (secondary nature) where higher roof deflections are acceptable. In areas with scattered obstructions, hedges, trees, buildings etc. (Terrain Category 2 1/2).
SNOW
These tables do not apply for elevations in excess of 300 metres or for Canterbury/Otago/Southland above 50 metres. In these areas “Snow Loads” should be considered by a qualified engineer.
FASTENERS
Use 14 gauge tek screws typical.
Use 2 screws at simple ends and 4 screws at lapped supports typically, except: • for fittings to cold rolled purlins with thickness less than 2.5mm BMT, use at simple ends use 2 screws, except use 4 screws for 150 Tophats. • at lapped supports use 4 screws for 60 Tophats, 6 screws for 100 Tophats, 8 screws for 120 & 150 Tophats.
OR Use strap detail.
LAP
Minimum lap between fixing is 15% of Tophat span.
3
HST TOPHATS DESIGN CAPACITY TABLES UNIFORMLY DISTRIBUTED LOAD - SINGLE SPAN 60 x 0.75 Fixings
Inward
G300 G450
Outward
60 x 0.95 Defl
Inward
2/12 g 2/12 g / 1.2 mm
Outward
100 x 0.75 Defl
Inward
2/12 g 2/12 g / 1.2 mm
Outward
100 x 0.95 Defl
Inward
2/12 g 2/12 g / 1.5 mm
Outward
Defl
2/12 g 2/12 g / 1.5 mm
Span 2.0
2.30
1.56
0.88
3.08
2.11
1.16
4.54
3.10
2.2
1.90
1.29
0.66
2.55
1.75
0.87
3.76
2.66
2.93
2.4
1.60
1.08
0.51
2.14
1.47
0.67
3.16
2.24
2.26
4.72
2.58
3.08
2.6
1.36
0.92
0.40
1.83
1.25
0.53
2.69
1.91
1.78
4.02
2.38
2.42
2.8
1.18
0.80
0.32
1.57
1.08
0.42
2.32
1.64
1.42
3.47
2.21
1.94
3.0
1.37
0.94
0.34
2.02
1.43
1.16
3.02
2.00
1.58
3.2
1.20
0.83
0.28
1.78
1.26
0.95
2.66
1.76
1.30 1.08
3.90
3.4
1.07
0.73
0.24
1.57
1.11
0.79
2.35
1.56
3.6
0.95
0.65
0.20
1.40
0.99
0.67
2.10
1.39
0.91
1.26
0.89
0.57
1.88
1.25
0.78
3.8 4.0
1.14
0.81
0.49
1.70
1.13
0.67
4.2
1.03
0.73
0.42
1.54
1.02
0.58
4.4
0.94
0.67
0.37
1.40
0.93
0.50
4.6
0.86
0.61
0.32
1.28
0.85
0.44
4.8
0.79
0.56
0.28
1.18
0.78
0.39
5.0
0.73
0.52
0.25
1.09
0.72
0.34 0.30
5.2
1.01
0.67
5.4
0.93
0.62
0.27
5.6
0.87
0.57
0.24
5.8 6.0 6.2 6.4 6.6 6.8 7.0 7.2 7.4 7.6 7.8 8.0 8.2 8.4 8.6 8.8 9.0
2. Loads 3.Fasteners
4. Bracing
4
32
HST Tophats are rolled from galvanised high strength steel strip Grade 500 (with Zinc Weight 275 gm/m2). The loads are ‘Limit-State’ loads to ‘NZS4203-1992’. Defl are serviceability loads, based on defection equal to span/150. Outward loads must be adjusted if alternative screw fixings or support member thicknesses are used. G300 option - 2.12g indicates 2 off 12 gauge tek screws and assumes a support member minimum thickness of 3 millimetres for Grade 300 steel or a minimum embedment of 37mm into timber with T17 screws. G450 option - 2/14g1.5mm indicates the number and gauge of fixings to cold rolled (g450/500) steel and the thickness of the support member. Outward loads shall be adjusted to a lower value if less screws or thinner support members are used. Battens screwed transversely along the underside the purlins will enhance the performance of the tophat purlins and are recommended where supports/restraints are further apart than 30x the tophat depth.
HST TOPHATS PRODUCT UPDATE
60
Notes: 1. Material
Centroid
65 108
HST 60 TOPHAT
HST TOPHATS DESIGN CAPACITY TABLES UNIFORMLY DISTRIBUTED LOAD - SINGLE SPAN 120 x 0.75 Fixings
Inward
G300 G450
120 x 0.95
Outward
Defl
Inward
2/14 g 2/14 g / 1.5 mm
150 x 0.95
Outward
Defl
Inward
2/14 g 2/14 g / 1.5 mm
150 x 1.15
Outward
Defl
Inward
2/14 g 2/14 g / 1.5 mm
Outward
Defl
2/14 g 2/14 g / 1.5 mm
Span 2.0 2.2 2.4
3.82
2.67
3.34
2.6
3.26
2.27
2.62
4.85
3.43
3.73
2.8
2.81
1.96
2.10
4.18
2.96
2.99
3.0
2.45
1.71
1.71
3.64
2.58
2.43
3.2
2.15
1.50
1.41
3.20
2.26
2.00
3.4
1.90
1.33
1.17
2.84
2.01
1.67
3.6
1.70
1.19
0.99
2.53
1.79
1.41
3.18
2.20
3.8
1.52
1.06
0.84
2.27
1.61
1.19
2.85
1.97
1.93
3.94
2.42
4.0
1.38
0.96
0.72
2.05
1.45
1.02
2.57
1.78
1.65
3.56
2.30
2.19
4.2
1.25
0.87
0.62
1.86
1.31
0.88
2.33
1.62
1.43
3.23
2.19
1.90
4.4
1.14
0.79
0.54
1.69
1.20
0.77
2.13
1.47
1.24
2.94
2.09
1.65
4.6
1.04
0.73
0.47
1.55
1.10
0.67
1.95
1.35
1.09
2.69
1.91
1.44
4.8
0.96
0.67
0.42
1.42
1.01
0.59
1.79
1.24
0.96
2.47
1.75
1.27
5.0
0.88
0.61
0.37
1.31
0.93
0.52
1.65
1.14
0.85
2.28
1.62
1.12
5.2
0.81
0.57
0.33
1.21
0.86
0.47
1.52
1.05
0.75
2.11
1.50
1.00
2.26 2.56
5.4
0.75
0.53
0.29
1.12
0.79
0.42
1.41
0.98
0.67
1.95
1.39
0.89
5.6
0.70
0.49
0.26
1.05
0.74
0.37
1.31
0.91
0.60
1.82
1.29
0.80
5.8
0.65
0.46
0.24
0.97
0.69
0.34
1.22
0.85
0.54
1.69
1.20
0.72
0.91
0.64
0.30
1.14
0.79
0.49
1.58
1.12
0.65
6.2
0.85
0.60
0.28
1.07
0.74
0.44
1.48
1.05
0.59
6.4
0.80
0.57
0.25
1.00
0.70
0.40
1.39
0.99
0.54
6.0
6.6
0.94
0.65
0.37
1.31
0.93
0.49
6.8
0.89
0.62
0.34
1.23
0.87
0.45
7.0
0.84
0.58
0.31
1.16
0.83
0.41
7.2
0.79
0.55
0.28
1.10
0.78
0.38
7.4
0.75
0.52
0.26
1.04
0.74
0.35
7.6
0.71
0.49
0.24
0.99
0.70
0.32
7.8
0.94
0.66
0.30
8.0
0.89
0.63
0.27
8.2 8.4 8.6 8.8 9.0 43
45
Centroid
R3 (T YP )
10
45°
100
5
3
2
R3 (T YP )
91 163
HST 100 TOPHAT 5
HST TOPHATS DESIGN CAPACITY TABLES UNIFORMLY DISTRIBUTED LOAD - LAPPED SPANS 60 x 0.75 Fixings
Inward
G300 G450
Outward
60 x 0.95 Defl
Inward
2/12 g 4/12 g / 1.2 mm
Outward
100 x 0.75 Defl
Inward
2/12 g 4/12 g / 1.2 mm
Outward
100 x 0.95 Defl
Inward
4/12 g 4/12 g / 1.5mm
Outward
Defl
4/12 g 6/12 g / 1.5 mm
Span 2.0
3.37
2.40
1.89
4.58
2.48
2.46
7.38
3.36
8.27
2.2
2.69
2.10
1.42
3.65
2.25
1.85
6.10
3.05
8.22
2.4
2.16
1.76
1.09
2.94
2.07
1.43
5.13
2.80
4.79
7.67
4.20
6.43
2.6
1.76
1.50
0.86
2.39
1.91
1.12
4.37
2.58
3.77
6.54
3.88
5.06
2.8
1.44
1.29
0.69
1.96
1.75
0.90
3.77
2.40
3.02
5.64
3.60
4.05
3.0
1.19
1.13
0.56
1.61
1.53
0.73
3.28
2.24
2.45
4.91
3.36
3.29
3.2
1.05
0.99
0.46
1.42
1.34
0.60
2.88
2.10
2.02
4.31
3.15
2.71
3.4
0.93
0.88
0.38
1.26
1.19
0.50
2.56
1.98
1.68
3.82
2.96
2.26
3.6
0.83
0.78
0.32
1.12
1.06
0.42
2.28
1.87
1.42
3.41
2.80
1.9
3.8
1.01
0.95
0.36
2.05
1.77
1.21
3.06
2.65
1.62
4.0
0.91
0.86
0.31
1.85
1.68
1.03
2.76
2.52
1.39
1.67
1.60
0.89
2.50
2.40
1.20 1.04
4.2 4.4
1.53
1.53
0.78
2.28
2.27
4.6
1.40
1.46
0.68
2.09
2.07
0.91
4.8
1.28
1.36
0.60
1.92
1.90
0.80
5.0
1.18
1.25
0.53
1.77
1.76
0.71
5.2
1.09
1.16
0.47
1.63
1.62
0.63 0.56
5.4
1.01
1.07
0.42
1.52
1.50
5.6
0.94
1.00
0.38
1.41
1.40
0.51
5.8
0.88
0.93
0.34
1.31
1.30
0.46
6.0
0.82
0.87
0.31
1.23
1.22
0.41
6.2
1.15
1.14
0.37 0.34
6.4
1.08
1.07
6.6
1.01
1.01
0.31
6.8
0.96
0.95
0.28
7.0 7.2 7.4 7.6 7.8 8.0 8.2 8.4 8.6 8.8 9.0
Notes: 1. Material
6
HST TOPHATS PRODUCT UPDATE
2
43
R3 (T YP )
120
3
5
65
Centroid R3 (T YP )
10
HST Tophats are rolled from galvanised high strength steel strip Grade 500 (with Zinc Weight 275 gm/m2). 2. Loads The loads are ‘Limit-State’ loads to ‘NZS4203-1992’. Defl are serviceability loads, based on defection equal to span/150. Outward loads must be adjusted if alternative screw fixings or support member thicknesses are used. 3. Fasteners G300 option - 2.12g indicates 2 off 12 gauge tek screws and assumes a support member minimum thickness of 3 millimetres for Grade 300 steel or a minimum embedment of 37mm into timber with T17 screws. G450 option - 2/14g1.5mm indicates the number and gauge of fixings to cold rolled (g450/500) steel and the thickness of the support member. Outward loads shall be adjusted to a lower value if less screws or thinner support members are used. 4. Lapping Laps shall be a minimum of 15% of the span between supports, measured between the lap screws. Provide 2 screws at lap ends for 60/100 tophats and 4 screws for 120/150 tophats. 5. Bracing Battens screwed transversely along the underside the purlins will enhance the performance of the tophat purlins and are recommended where supports/restraints are further apart than 30x the tophat depth.
98 170
HST 120 TOPHAT
HST TOPHATS DESIGN CAPACITY TABLES UNIFORMLY DISTRIBUTED LOAD - LAPPED SPANS 120 x 0.75 Fixings
Inward
G300 G450
Outward
120 x 0.95 Defl
Inward
4/12 g 6/12 g / 1.5 mm
Outward
150 x 0.95 Defl
Inward
4/14 g 6/14 g / 1.5 mm
150 x 1.15
Outward
Defl
Inward
4/14 g 6/14 g / 1.5 mm
Outward
Defl
6/14 g 8/14 g / 1.5 mm
Span 2.0 2.2 2.4
5.14
4.60
2.6
4.74
4.25
7.26 5.71
3.43
3.73
2.8
4.41
3.94
4.57
2.96
2.99
3.0
3.97
3.68
3.72
5.92
3.68
5.08
3.2
3.49
3.45
3.06
5.20
3.45
4.19
3.4
3.09
3.24
2.55
4.61
3.25
3.49
3.6
2.76
2.89
2.15
4.11
3.07
2.94
5.16
3.07
3.8
2.48
2.59
1.83
3.69
2.91
2.50
4.63
2.91
4.90 4.17
6.41
3.87
5.35
4.0
2.24
2.34
1.57
3.33
2.76
2.15
4.18
2.76
3.58
5.78
3.68
4.58
4.2
2.03
2.12
1.36
3.02
2.63
1.85
3.79
2.63
3.09
5.25
3.50
3.96
4.4
1.85
1.93
1.18
2.75
2.51
1.61
3.46
2.51
2.69
4.78
3.35
3.44
4.6
1.69
1.77
1.03
2.52
2.40
1.41
3.16
2.40
2.35
4.37
3.20
3.01
4.8
1.55
1.63
0.91
2.31
2.300
1.24
2.90
2.30
2.07
4.02
3.07
2.65
5.0
1.43
1.50
0.80
2.13
2.21
1.10
2.68
2.21
1.83
3.70
2.94
2.35
5.2
1.32
1.39
0.71
1.97
2.08
0.98
2.47
2.12
1.63
3.42
2.83
2.09 1.86
5.4
1.23
1.28
0.64
1.83
1.93
0.87
2.29
2.04
1.45
3.17
2.73
5.6
1.14
1.19
0.57
1.70
1.80
0.78
2.13
1.97
1.30
2.95
2.63
1.67
5.8
1.06
1.11
0.51
1.58
1.67
0.70
1.99
1.90
1.17
2.75
2.54
1.50
6.0
0.99
1.04
0.46
1.48
1.56
0.64
1.86
1.84
1.06
2.57
2.45
1.36
6.2
0.93
0.97
0.42
1.39
1.47
0.58
1.74
1.78
0.96
2.41
2.37
1.23
6.4
0.87
0.91
0.38
1.30
1.38
0.52
1.63
1.70
0.87
2.26
2.30
1.12
6.6
0.82
0.86
0.35
1.22
1.29
0.48
1.54
1.59
0.80
2.12
2.23
1.02
6.8
0.77
0.81
0.32
1.15
1.22
0.44
1.45
1.50
0.73
2.00
2.12
0.93
7.0
0.73
0.76
0.29
1.09
1.15
0.40
1.37
1.42
0.67
1.89
2.00
0.86
7.2
0.69
0.72
0.27
0.79
1.03
1.09
0.37
1.29
1.34
0.61
1.79
1.89
7.4
0.97
1.03
0.34
1.22
1.27
0.56
1.69
1.79
0.72
7.6
0.92
0.98
0.31
1.16
1.20
0.52
1.60
1.69
0.67
7.8
0.88
0.93
0.29
1.10
1.14
0.48
1.52
1.61
0.62
8.0
0.83
0.88
0.27
1.05
1.09
0.45
1.45
1.53
0.57
8.2
0.99
1.03
0.42
1.38
1.46
0.53
8.4
0.95
0.98
0.39
1.31
1.39
0.49
8.6
0.90
0.94
0.36
0.46
1.25
1.32
8.8
1.20
1.25
0.43
9.0
1.14
1.21
0.40
R3 (T YP )
2
43
100
150
3
5
Centroid
10
R3 (T YP ) 110 183
HST 150 TOPHAT 7
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