
Material Specifications
Material Properties |
Finish |
0.55 BMT |
Minimum 'AZ' Coating Mass (g/m²) |
Zinc/al & Colour |
150 |
Mass (kg/linear metre) |
Zinc/al |
2.71 |
Colour |
2.75 |
Mass (kg/square metre) |
Zinc/al |
5.97 |
Colour |
6.05 |
Yield (square metre/tonne) |
Zinc/al |
168 |
Colour |
165 |
Tensile Strength (MPa) |
Zinc/al & Colour |
340 |
Width Coverage (mm) |
Zinc/al & Colour |
455 |
Sheet Tolerances (mm) |
Length & Width |
±5 ±2 |
Minimum Roof Pitch |
Zinc/al & Colour |
3° |
Maximum Recommended Spans
Maximum Recommended Spans |
Span Type |
Roofing 0.55mm BMT (mm) |
Walling 0.55mm BMT (mm) |
End/ Double |
600 |
1800 |
Internal |
900 |
1800 |
Roofing : Spans are limited based on foot traffic incidental to maintenance.
Walling: Spans are based Region A, Terrain Category 2.0 wind loading, refer to the 'Spans' table below.
Spans
Roofing Spans (mm) |
Terrain Category |
Local Pressure KI |
Region A |
Region W |
End/Double |
Internal |
End/Double |
Internal |
1 |
1 |
600 |
900 |
600 |
900 |
1.5 |
600 |
900 |
600 |
900 |
2 |
600 |
900 |
600 |
900 |
3 |
600 |
900 |
560 |
620 |
2 |
1 |
600 |
900 |
600 |
900 |
1.5 |
600 |
900 |
600 |
900 |
2 |
600 |
900 |
600 |
900 |
3 |
600 |
900 |
600 |
900 |
3 |
1 |
600 |
900 |
600 |
900 |
1.5 |
600 |
900 |
600 |
900 |
2 |
600 |
900 |
600 |
900 |
3 |
600 |
900 |
600 |
900 |
Walling Spans (mm) |
Terrain Category |
Local Pressure KI |
Region A |
Region W |
End/Double |
Internal |
End/Double |
Internal |
1 |
1 |
1800 |
1800 |
1800 |
1800 |
1.5 |
1800 |
1800 |
1800 |
1800 |
2 |
1800 |
1800 |
1470 |
1600 |
3 |
1320 |
1450 |
950 |
1080 |
2 |
1 |
1800 |
1800 |
1800 |
1800 |
1.5 |
1800 |
1800 |
1800 |
1800 |
2 |
1800 |
1800 |
1790 |
1800 |
3 |
1640 |
1760 |
1280 |
1410 |
3 |
1 |
1800 |
1800 |
1800 |
1800 |
1.5 |
1800 |
1800 |
1800 |
1800 |
2 |
1800 |
1800 |
1800 |
1800 |
3 |
1800 |
1800 |
1800 |
1800 |
Wind Capacities (kPa)
Wind Capacities (kPa) |
BMT |
Span Type |
Linit State |
Span (mm) |
450 |
600 |
900 |
1200 |
1500 |
1800 |
0.55mm |
End/Double |
Serviceability |
5.23 |
3.78 |
3.14 |
2.57 |
2.08 |
1.68 |
Strength |
6.54 |
4.73 |
3.92 |
3.21 |
2.60 |
2.10 |
Internal |
Serviceability |
5.23 |
3.78 |
3.14 |
2.57 |
2.08 |
1.68 |
Strength |
7.15 |
5.17 |
4.29 |
3.51 |
2.85 |
2.30 |
Capacities determined based on a minimum of two screws per clip into timber supports.
Engineering
Testing Systems
Stratco have developed purpose built testing equipment for the testing of cladding systems sufficient to ensure the structural adequacy of the product it produces.
Compliance
Wind Capacity Tables are based on testing for compliance with the New Zealand Metal Roof and Wall Cladding Code of Practice. Span tables have been developed by determining relevent wind pressures in accordance with AS/NZS 1170.2. Capacity tables are in limit state format.
Spans
Span tables are based on a maximum overall building height of ten metres and a 500 year design return period for strength limit state wind load assessment. Roofing spans specified are suitable for snow loading up to 2kPa in accordance with the New Zealand Metal Roof and Wall Cladding Code of Practice.
Roofing calculations are based on Cpe=-0.9 and Cpi=0.2, walling is based on Cpe=-0.65 and Cpi=0.2. Local pressures are as specified and have been considered for both strength and serviceability limit states. Roof spans take into consideration loads incidental to maintenance noting ends spans allow for foot traffic over supports only.
All pressures have been determined assuming wind loading in any direction without shielding but which is not affected by topography (i.e. Mt=1.0). Allocated spans do not allow for Lee Zones, for areas within these zones, utilise the wind capacity tables to calculate spans based on the relevant allowance for Lee Multipliers.
Additional engineering advice can be obtained from Stratco if any design parameters vary from those indicated above.
Design Considerations
Hiland Roofing and Walling has a 455mm cover with a 0.55mm BMT material thickness. The minimum allowable roof pitch is 3°.