Smartspan® Technical Information

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Material Specifications

Material Specifications
Material Properties	Finish	0.42 BMT	0.48 BMT
Total Coated Thickness (TCT) mm	Zinc/alum	0.47	0.53
Total Coated Thickness (TCT) mm	Colour	0.50	0.56
Mass (kg / linear metre)	Zinc/alum	3.26	3.70
Mass (kg / linear metre)	Colour	3.32	3.76
Mass (kg / square metre)	Zinc/alum	4.66	5.28
Mass (kg / square metre)	Colour	4.74	5.37
Yield (square metre / tonne)	Zinc/alum	214.6	189.4
Yield (square metre / tonne)	Colour	211.0	186.2
Tensile Strength (MPa)	Zinc/alum & Colour	550	550
Width Coverage (mm)	Zinc/alum & Colour	700	700
Sheet Tolerances (mm)	Length & Width	±5 ±2	±5 ±2
Minimum Roof Pitch	Zinc/alum & Colour	2˚	2˚

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.

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 Load Conversion
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

Maximum Recommended Spans

Maximum Recommended Spans (mm)
Span Type	Roofing (BMT)		Walling (BMT)
Span Type	0.42 mm	0.48 mm	0.42 mm	0.48 mm
Single Span	1350	2000	2550	2600
End Span	1800	2300	3200	3300
Internal Span	2400	3000	3500	3600
Un-stiffened Overhang	200	250	200	250
Stiffened Overhang	500	600	500	600
Roofing spans are limited, based on typical maintenance foot traffic. Walling spans are based on N1 (W28) wind loading. All spans are based on four fasteners per sheet, per support. The values are for use with steel supports with a minimum thickness of 0.75mm, G550.

Domestic Carport / Verandah Spans

Domestic Carport / Verandah Spans (mm)
Wind Classification	Base Metal Thickness
Wind Classification	0.42 mm	0.48 mm
N1 (W28)	2500	2700
N2 (W33)	2500	2700
N3 (W41)	2100	2300
N4 (W50)	1800	2000
The values are for use with steel supports with a minimum thickness of 0.75mm, G550.

Spans

Spans (mm)
BMT	Application	Span Type	Three Fasteners				Four Fasteners
BMT	Application	Span Type	N1 (W28)	N2 (W33)	N3 (W41)	N4 (W50)	N1 (W28)	N2 (W33)	N3 (W41)	N4 (W50)
0.42 mm	Roofing	Single	1350	1350	1350	-	1350	1350	1350	1350
		End	1800	1800	1700	-	1800	1800	1800	1500
		Internal	2400	2000	1800	-	2400	2400	2250	1600
	Walling	Single	2300	1950	1750	1500	2550	2050	1900	1750
		End	3000	2300	1950	1550	3200	2650	2150	1800
		Internal	3300	2500	2000	1750	3500	3100	2750	1950
0.48 mm	Roofing	Single	2000	1850	1500	-	2000	2000	1800	1700
		End	2300	2100	1800	-	2300	2300	2100	1750
		Internal	3000	2350	2000	-	3000	2850	2350	2000
	Walling	Single	2350	2100	1850	1750	2600	2250	2050	1950
		End	3000	2350	2100	1850	3300	2700	2300	2150
		Internal	3400	2950	2350	1950	3600	3300	2850	2400
The values are for use with steel supports with a minimum thickness of 0.75mm, G550.

Wind Capacities

Wind Capacities (kPa)
BMT	Span Type	Limit State	Span (mm) Three Fasteners										Span (mm) Four Fasteners
BMT	Span Type	Limit State	1200	1500	1800	2100	2400	2700	3000	3300	3600	3900	1200	1500	1800	2100	2400	2700	3000	3300	3600	3900
0.42 mm	Single	Serviceability	2.09	1.64	1.18	0.73	0.58	0.43	-	-	-	-	2.73	2.12	1.52	0.91	0.71	0.51	-	-	-	-
	Single	Strength	4.74	4.30	3.87	3.43	3.07	2.71	-	-	-	-	6.06	5.34	4.62	3.90	3.50	3.11	-	-	-	-
	End	Serviceability	2.41	1.97	1.52	1.08	0.93	0.79	0.64	0.49	0.35	-	3.36	2.67	1.97	1.27	1.09	0.91	0.73	0.55	0.36	-
	End	Strength	3.95	3.44	2.92	2.40	2.16	1.92	1.67	1.43	1.19	-	5.27	4.51	3.76	3.00	2.74	2.48	2.22	1.96	1.70	-
	Internal	Serviceability	2.82	2.24	1.67	1.09	0.98	0.87	0.75	0.64	0.53	-	4.27	3.44	2.61	1.77	1.52	1.27	1.03	0.78	0.53	-
	Internal	Strength	4.96	4.09	3.22	2.35	2.13	1.91	1.69	1.47	1.25	-	5.55	4.78	4.00	3.23	2.95	2.67	2.40	2.12	1.84	-
0.48 mm	Single	Serviceability	-	1.70	1.32	0.94	0.55	0.47	0.38	0.30	-	-	-	2.20	1.70	1.20	0.70	0.57	0.43	0.30	-	-
	Single	Strength	-	4.75	4.21	3.67	3.13	2.74	2.34	1.95	-	-	-	6.10	5.53	4.95	4.38	3.86	3.33	2.81	-	-
	End	Serviceability	-	2.05	1.67	1.29	0.91	0.77	0.63	0.48	0.34	0.20	-	2.91	2.31	1.72	1.12	0.95	0.78	0.61	0.44	0.27
	End	Strength	-	4.01	3.48	2.96	2.44	2.13	1.83	1.52	1.22	0.91	-	5.10	4.44	3.78	3.12	2.78	2.45	2.12	1.79	1.46
	Internal	Serviceability	-	2.30	1.94	1.57	1.21	1.06	0.91	0.77	0.62	0.47	-	3.57	2.90	2.22	1.55	1.34	1.14	0.93	0.73	0.53
	Internal	Strength	-	4.33	3.72	3.11	2.49	2.18	1.87	1.56	1.24	0.93	-	5.67	4.96	4.26	3.55	3.15	2.74	2.33	1.92	1.51
The values are for use with steel supports with a minimum thickness of 0.75mm, G550.

Water Carrying Capacity

Maximum Roof Run For Drainage (m)
Roof Slope	Peak Rainfall Intensity (mm / hr)
Roof Slope	150	180	200	250	300	350	400	450
2°	86	72	64	51	43	37	32	28
5°	137	114	102	82	68	58	51	45
7.5°	168	140	126	100	84	72	63	56
10°	194	162	145	116	97	83	73	64
15°	239	199	179	143	119	102	89	79
22°	294	245	220	176	147	126	110	98
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.