About CorroMax 35™
With corrugations 60% deeper and ribs that are 50% wider than our traditional S-Rib profile, CorroMax™ 35 delivers significant performance benefits over the life of the building. This includes an increased rainwater carrying capacity, longer spanning capabilities as well as the ability to be installed on roof pitches as low as 2 degrees.
Material Specifications
| Property | Notes | ||
| Base Metal Thickness (mm) | 0.48 | BMT | |
| Mass / Unit Length | COLORBOND® | 4.00* | kg/m |
| Mass / Unit Area | COLORBOND® | 5.50* | kg/m |
| Minimum Yield Strength | G550 | Base Steel Designation | |
| Coating Class | Z600 (Heritage Galvanised) AM100 (COLORBOND ) AM125 (Zincalume) AM150 (COLORBOND Ultra) Z450 (Galvanised) | Minimum Coating g/m2 of Zinc - Aluminium |
|
| Coverage (mm) | 724 | ||
| Tolerance | Length: + 10mm, – 10mm Width: + 4mm, – 4mm | ||
Notes:
- CorroMax 35™ is manufactured in accordance to AS 1445 and from materials in accordance to AS 1397 and AS 2728. It is to be installed in accordance with AS 1562 and HB 39.
- The sectional properties are theoretical values per sheet width. These properties are gross values only.
- *is based on Standard COLORBOND® single-sided material. For other painted steel options please contact a Fielders® representative.
Rainfall Capacity
For further information, please refer to sections "Rainfall Intensity" and "Water Carrying Capacity and Rainwater Run-Off".
Maximum Roof Length (m)
| Roof Slope (degrees) | Rainfall Capacity (mm/hr) | ||||||
| 100 | 150 | 200 | 250 | 300 | 400 | 500 | |
| 2 | 90 | 60 | 45 | 36 | 30 | 23 | 18 |
| 3 | 103 | 69 | 51 | 41 | 34 | 26 | 21 |
| 5 | 124 | 82 | 62 | 49 | 41 | 31 | 25 |
Notes:
- Minimum recommended slope is 2°. Sheet lengths greater than 24m are not recommended due to thermal expansion and contraction.
Load Span Tables
Wind Load Capacity: Limit State Design: 0.48mm BMT
| Span (mm) | Single Span | End Span | Internal Span | |||
| Serv. (kPa) | Strength (kPa) | Serv. (kPa) | Strength (kPa) | Serv. (kPa) | Strength (kPa) | |
| 600 | 8.97 | 11.88 | 6.30 | 11.61 | 3.65 | 10.17 |
| 900 | 7.97 | 11.88 | 5.61 | 11.61 | 3.42 | 10.17 |
| 1200 | 6.59 | 11.88 | 3.50 | 9.00 | 2.67 | 8.60 |
| 1500 | 4.50 | 8.00 | 2.38 | 0.08 | 2.08 | 7.02 |
| 1800 | 2.80 | 5.80 | 1.81 | 5.42 | 1.61 | 5.66 |
| 2100 | 1.44 | 4.19 | 1.49 | 4.08 | 1.20 | 4.30 |
| 2400 | - | - | 1.26 | 3.00 | 1.00 | 3.55 |
| 2700 | - | - | 1.19 | 2.19 | 0.90 | 3.31 |
Note:
- Values in the table above have been generated based on testing into steel supports with at thickness of 1.0mm.
- Values are based on no insulation under the sheeting.
- Serv. denotes serviceability
Figure CM35 NC 002 End Spans, Internal Spans and Overhangs illustrates the terminology end spans, internal spans, and overhangs and their reference to the supporting substructure. This terminology has been used in the following Maximum Recommended Span and Wind Load Capacity tables.
Figure CM35 NC 002 End Spans, Internal Spans and Overhangs
Maximum Recommended Roof Cladding Span
| Wind Region | Base Metal Thickness (mm) | Terrain Category 3 | ||
| Single (mm) | End (mm) | Internal (mm) | ||
| B | 0.48 | 1300 | 1600 | 2400 |
Importance Level 2
Maximum Roof Height H = 10m
External Pressure Coefficient:
Cpe = -0.65 for walling
Cpe = -0.9 for roofing
Internal Pressure Coefficient:
Cpi = 0.2
Local Pressure Factor:
KL = 2.0 (end & single span)
KL = 1.0 (internal span)
Table CM35 RS NC 001 - CorroMax 35™ Non-Cyclonic
Note:
- For roofs: the data are based on foot-traffic loading.
- Table data are based on supports of minimum 1mm BMT.
Maximum Recommended Wall Cladding Span
| Wind Region | Base Metal Thickness (mm) | Terrain Category 3 | ||
| Single (mm) | End (mm) | Internal (mm) | ||
| B | 0.48 | 2100 | 2700 | 2700 |
Importance Level 2
Maximum Roof Height H = 10m
External Pressure Coefficient:
Cpe = -0.65 for walling
Cpe = -0.9 for roofing
Internal Pressure Coefficient:
Cpi = 0.2
Local Pressure Factor:
KL = 2.0 (end & single span)
KL = 1.0 (internal span)
Table CM35 WS NC 001 - CorroMax 35™ Non-Cyclonic
Note:
- For roofs: the data are based on foot-traffic loading.
- For walls: the data are based on pressures (see wind pressure table).
- Table data are based on supports of minimum 1mm BMT.
Pierce Fixing
Fasteners must be selected to match the life expectancy of the cladding material. Recommendations from fastener manufacturers should be sought.
Only fasteners complying with AS 3566:2002 and those that are compatible with the roofing material should be used for its fastening.
Pierce Fixing Table
| Fixing Supports | Crest Fixing | Valley Fixing (Wall only) | Side Lap Fixing |
| Steel 1.0 to 3.0mm | 12-14x68, Metal Teks HG, HH | 10-16x16, Metal Teks, HH or 10-16x25 Designer Head | (If required) 10-16x16, Metal Teks, HH or Roof Zips M6-11x25 or 10-16x25 Designer Head or Sealed blind rivet ø4.8mm aluminium |
| Timber Hardwood | 12-11x65, Type 17 HG, HH | 10-12x25, Type 17, HH 10-16x25 Designer Head or 12-11x25, Type 17, HH |
|
| Timber Softwood | 12-11x65, Type 17 HG, HH or Roof Zips M6-11x65 HG, HH | 10-12x30, Type 17, HH 12-11x25, Type 17, HH 10-16x25 Designer Head or Roof Zips M6-11x25 |
|
| Metal Battens (0.55 to 1.0mm) | Roof Zips M6-11x65 | 10-16x16, Metal Teks, HH or 10-16x25 Designer Head or Roof Zips M6-11x25 |
Fastener Spacings - Non-Cyclonic ****Accent 35 Figure to be supplied****
Crest Fastener Location
Up to 6 Fasteners per sheet – end supports and end laps.
3 Fasteners per sheet – Internal supports.
Roofing should be lapped away from the prevailing weather.
Valley Fastener Location (Wall Only)
Up to 6 Fasteners per sheet – end supports and end laps.
3 Fasteners per sheet – Internal supports.
Table SR FS NC 001
Notes:
1. All fasteners used externally should be fitted with an EPDM seal (washer).
2. Do not use punches to form fastener holes.
Side Lap Fastening
It may be necessary to use side lap fasteners at mid spans when using S-Rib at maximum spans. These will help to hold the sheet laps firmly in place and maintain a weather-proof joint.
Insulation
Care needs to be taken when installing insulation with roof sheeting. When insulation thickness up to 50mm are installed the screws detailed in Table SR PF NC 001 may need to be increased depending on the thickness and density of the insulation. When the screw is properly tightened into metal there should be a minimum of three (3) threads protruding past the support being fixed in to. For timber the screw must penetrate the timber as much as the screws detailed in Table SR PF NC 001 do without insulation.
For insulation thicknesses greater than 50mm Fielders® recommend the use of a thermal spacer to help maintain Rw values as well as minimising any bulging in the profile caused by the insulation.
Curving CorroMax 35™
For details regarding spring, crank and smooth curving of CorroMax 35™ sheets, please see section “Curving of Steel Decks”.
Curving quality corrugated is manufactured from G300 sub-strate (0.60 BMT). It is consequently more ductile, enabling specialist tradesmen using precision curving machines to form sheets to traditional heritage shapes and challenging architectural details down to radii as tight as 450mm. Fielders® have a dedicated roll forming machine for G300 thus avoiding any inconsistency arising out of changing over from G550 Hi-tensile coil.
CorroMax 35™ Installation Procedure
For installation procedures see section “Typical Pierce Fix Installation Guide”. For general handling instructions refer to section “Maintenance and Care”.
Figure CM35 NC Corrugation Laps 003
Maximum Sheet Length
See section “Thermal Expansion and Contraction of Steel Sheeting”.
Turning of Roof Sheeting Ends
Refer to section “Flashings, Cappings & Ends of sheets”.
Curving Orders
When ordering curved sheets, please state the following:
|
ZINCALUME® |
Sheets |
|
COLORBOND® |
Sheets |
|
Color |
Sheets |
|
Direction of laying (facing roof) |
|
|
Left to right |
Sheets |
|
Right to Left |
Sheets |
|
Overall Length of Sheet (Allow 50mm into Gutters) |
mm |
Bullnosed
|
A |
Radius (minimum 500mm) |
mm |
|
B |
Pitch or fall |
mm |
|
D |
Wall to outside fascia |
mm |
|
E |
Straight length |
mm |
|
H |
Height |
mm |
Figure CM35 NC Bullnosed Dimensions 004
Concave
|
D |
Wall to outside fascia |
mm |
|
H |
Height |
mm |
|
X |
Dip from Straight Line |
mm |
Figure CM35 NC Concave Dimensions 005
Bull Nosing
Curving to Underslung or Overslung
Radius Curve (Deep Curve)
‘S’ Curve
Ridge Curve and Bullnoosing with extended straight section
Figure CM35 NC Typical Curves 006
Curved Flashings
COLORBOND® and ZINCALUME® steel roofing gives the designer or architect greater flexibility than other roofing materials. Fielders® curved flashings offer an attractive, watertight method of finishing off barges. Fielders® sheet-metal workshop uses either Pittsburgh or Snap-Lock seams to achieve a curved profile flashing. Acrylead and flexible Dektite flashings may also be used.
Figure CM35 NC Pittsburgh Lock-Seam and Snap-Lock 007
Curved Flashing Available Materials
| Finish | Conforming to Standard | BMT | Colour |
| ZINCALUME® | AS 1397 G300-AZ150 | 0.50 | N/A |
| COLORBOND® XRW | AS 1397 G300-AZ150 and AS 2728 | 0.50 | As selected |
| COLORBOND® Ultra | AS 1397 G300-AZ200 and AS 2728 | 0.55 | As selected |
| COLORBOND® Stainless | Grade 430 base 300 | 0.45 | As selected |
| Z600 Heritage Galvanised | AS 1397 G300-Z600 | 0.50 | N/A |
Hip Bracing
Figure CM35 NC Type A Hip Bracing 008
Figure CM35 NC Type B Hip Bracing 009
Cappings
Refer to section “Cappings”.
Perforated Metal
S-Rib corrugated is also available ex stock in 0.48 BMT ZINCALUME® steel , conforming to AS 1397:2001 G550- AZ150, or in COLORBOND® steel (Surfmist only) to AS 1397:2001 G550-AZ150 with 2.38mm diameter holes at 6.74 pitch providing 11% open area. Other materials and gauges with different hole sizes and pitches are available upon request.