Prodek® Technical Information

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Material Specifications

Material Specifications
Material Properties 0.35mm BMT 0.42mm BMT 0.48mm BMT
Zinc/alum Colour Zinc/alum Colour Zinc/alum Colour
Total Coated Thickness (mm) 0.40 0.43 0.47 0.50 0.53 0.56
Mass (kg/linear metre) 2.74 2.79 3.26 3.32 3.70 3.76
Mass (kg/square metre) 4.22 4.29 5.02 5.11 5.69 5.78
Yield (square metre tonne) 237.0 233.1 199.2 195.7 175.7 173.0
Tensile Strength (MPa) G550 G550 G550 G550 G550 G550
Width Coverage (mm) 650 650 650 650 650 650
Sheet Tolerances (mm) Length & Width ±5 ±2 ±5 ±2 ±5 ±2 ±5 ±2 ±5 ±2 ±5 ±2
Minimum Roof Pitch N/A N/A 1° 1° 1° 1°

Design considerations

The minimum recommended roof pitch for Prodek is one degree (1 in 60). With a one degree fall, ensure that building settlement or the warping of timber structural sections does not cause ‘ponding' on the surface of the roof. The 650mm coverage of Prodek provides easy handling and installation. Prodek roofing is subject to thermal expansion, particularly on darker colours. The maximum length before an expansion joint is required is 24 metres for lighter colours, and 16 metres for darker colours.

Compliance

The Wind Capacity Tables are based on testing in accordance with AS1562.1-1992 and AS4040.0, 1 & 2- 1992. Span tables have been developed by determining wind pressures in accordance with AS4055-2006 for domestic applications and AS/NZS 1170.2:2002 for all other applications. Capacity tables are in limit state format.

Spans

Spans are determined by wind speeds for non-cyclonic areas. For domestic applications, the pressures and spans are based on a maximum: eaves height of six metres, roof pitch of 35 degrees and total roof height of 8.5 metres. For commercial and industrial applications, tables are based on a maximum overall height of ten metres and a 500 year design return period.

Roofing calculations are based on Cpe=-0.9 and Cpi=0.2, walling is based on Cpe=-0.65 and Cpi=0.2. A local pressure factor, Kl=2.0 has been used for all roofing and walling spans for both strength and serviceability limit states. Roof spans allow for loads incidental to maintenance.

All pressures have been determined assuming the wind loading in any direction is not affected by topography. The following shielding factors have been used for each of the terrain categories: Category 3 = 0.85, Category 2.5 = 0.95, and Category 2 = 1.

The carport and verandah spans only apply to structures not enclosed by peripheral walls. Spans are based on Cpn=-0.9 and Kl=1.5 applied over the entire span, and are suitable for all span types. Loads on supporting purlins may limit these spans.

Stratco can provide additional engineering advice if any design parameters vary from those above.

Maximum Recommended Spans (mm)

Maximum Recommended spans
Span Type Roofing BMT Walling BMT
0.42mm 0.48mm 0.35mm 0.42mm 0.48mm
Single Span 2600 3100 2400 3000 3600
End Span 2800 3400 2700 3500 4000
Internal Span 3200 3800 3000 3800 4200
Unstiffened Overhang 200 250 150 200 250
Stiffened Overhang 600 650 400 600 650
Roofing : Spans are limited based on typical maintenance foot traffic.
Walling : Spans based on N1 (W28) wind loading.

 

Domestic Carport / Verandah Spans (mm)
Wind Classification Base Metal Thickness
0.42mm 0.48mm
N1 (W28) 3700 4250
N2 (W33) 2950 3750
N3 (W41) 2200 3300
N4 (W50) 2050 3100

Prodek Spans (mm)

Determined by wind speeds for non-cyclonic areas
Base Metal
Thickness		 Application Type of Span Wind Classification
N1 (W28) N2 (W33) N3 (W41) N4 (W50)
0.35mm Walling Single 2400 2350 1950 1600
End 2700 2700 2050 1800
Internal 3000 3000 2200 1800
0.42mm Roofing Single 2600 2050 1850 1550
End 2800 2500 1900 1550
Internal 3200 2750 2050 1650
Walling Single 3000 2700 2050 1800
End 3500 3100 2200 1800
Internal 3800 3400 2800 1950
0.48mm Roofing Single 3100 3100 2350 1850
End 3400 3400 2350 1850
Internal 3800 3800 2900 2000
Walling Single 3600 3600 3100 2200
End 4000 3900 3300 2200
Internal 4200 4200 3700 2500
Values applicable for use with steel supports of minimum 0.95mm thickness, G550.


Note: For Prodek span table wind capacities, design parameters and span definitions, please refer to the Cladding Wind Capacities tables and Engineering notes at the beginning of the Roofing and Walling section.

Wind Load Conversion

For domestic applications use the appropriate wind classification for the area. To read the span tables for commercial and industrial applications, select the region and category for the area, then convert it to the correct classification using table below.

Wind Classification (domestic) Region & Category (Commercial / Industrial)
N1 (W28) Reg A, Cat 3
N2 (W33) Reg A, Cat 2.5 - Reg B, Cat 3
N3 (W41) Reg A, Cat 2 - Reg B, Cat 2.5
N4 (W50) Reg B, Cat 2

 

Wind Capacities

Wind Capacities (kPa)
BMT Span Type Limit State Span (mm)
1200 1500 1800 2100 2400 2700 3000 3300 3600 3900 4200 4500
0.35mm Single Serviceability 2.05 1.72 1.40 1.08 0.92 0.82 0.71 0.61 0.51 0.40 0.30 0.19
Strength 4.60 3.75 2.89 2.04 1.46 1.35 1.25 1.14 1.03 0.92 0.82 0.71
End Serviceability 2.46 2.12 1.77 1.42 1.08 0.97 0.86 0.75 0.64 0.53 0.42 0.31
Strength 5.38 4.46 3.54 2.23 1.69 1.58 1.47 1.36 1.25 1.14 1.03 0.92
Internal Serviceability 2.67 2.31 1.95 1.59 1.23 1.10 0.98 0.85 0.73 0.60 0.47 0.35
Strength 5.58 4.54 3.50 2.46 1.85 1.74 1.63 1.52 1.41 1.30 1.19 1.08
0.42mm Single Serviceability 3.23 2.54 1.85 1.15 1.04 0.93 0.82 0.70 0.59 0.48 0.42 0.37
Strength 6.08 4.87 3.67 2.46 2.31 2.16 2.01 1.87 1.72 1.57 1.42 1.27
End Serviceability 3.46 2.79 2.13 1.46 1.31 1.15 1.00 0.85 0.69 0.54 0.46 0.38
Strength 6.04 4.79 3.55 2.31 2.18 2.05 1.92 1.79 1.66 1.53 1.41 1.28
Internal Serviceability 4.08 3.42 2.75 2.09 1.43 1.28 1.13 0.98 0.83 0.68 0.65 0.63
Strength 6.35 5.18 4.01 2.85 2.64 2.43 2.22 2.01 1.79 1.58 1.50 1.42
0.48mm Single Serviceability 4.23 3.59 2.96 2.32 1.68 1.50 1.32 1.13 0.95 0.77 0.58 0.40
Strength 6.63 5.75 4.88 4.00 3.12 2.85 2.58 2.31 2.04 1.78 1.51 1.24
End Serviceability 4.62 3.96 3.31 2.65 2.00 1.79 1.58 1.37 1.16 0.95 0.74 0.53
Strength 6.54 5.63 4.71 3.79 2.87 2.67 2.46 2.26 2.06 1.85 1.65 1.44
Internal Serviceability 4.77 4.13 3.50 2.87 2.23 2.02 1.81 1.60 1.39 1.18 0.97 0.76
Strength 6.70 5.89 5.08 4.27 3.46 3.19 2.92 2.65 2.37 2.10 1.83 1.56
the values are for use with steel supports with a minimum thickness of 0.95mm, G550.

Water Carrying Capacity

Maximum Roof Run for Drainage (m)
Roof Slope Peak Rainfall Intensity (mm / hr)
150 180 200 250 300 350 400 450
1° 319 266 239 191 159 137 119 106
2° 452 377 339 271 226 193 169 150
3° 554 461 415 332 271 237 207 184
5° 716 596 537 429 358 307 268 238
7.5° 878 732 658 527 439 376 329 292
10° 1016 847 762 610 508 436 381 338
The peak rainfall intensities shown represent a 100 year average recurrence interval (ARI) for a five minute rainfall duration. If roof penetrations exist, the total roof run will generally be greater than the distance from ridge to eaves at the location the penetration interferes with the runoff. Contact Stratco if further advice is required.