V-Rib

Standard Colours

For Designer, Metallic and Gloss colours, download the ColorCote® special colours brochure.

Black
Minimum pitch
Rib type
High
Ribs per sheet
10
Width
915mm cover
966mm sheet
Suitable for
Residential
Light commercial
Commercial
Manufactured in
Christchurch
Terms & Conditions

V-Rib Performance



The clean-cut, striking appearance of V-Rib makes it a very popular roofing and cladding profile used on a wide range of applications. The symmetrical sections have inherent strength characteristics which provide a good tolerance to foot traffic as well as the title of the strongest drape curved roofing profile available. Where design criteria demands continuous length, economy and simple, speedy construction choose V-Rib.



Cover (mm)
Sheet width (mm)
Minimum Pitch
915
Sheet width (mm)
966
Minimum Pitch
4º (approx. 1:15)

All dimensions given are nominal

Sheet Tolerances
Sheet width: ±5mm
Sheet width for aluminium +0, -15. If sheet cover widths are critical, advise Dimond at time of order.
Sheet length: +10mm, –0mm. For horizontal wall cladding where notified at time of order of intended use, tighter tolerances can be achieved +3mm, –0mm.

Material Options
Steel 0.40mm
Steel 0.55mm
Aluminium 0.70mm
Aluminium 0.90mm
Duraclad 1.7mm total
Nominal weight/lineal metre (kg/m)
Steel 0.40mm
4.12
Steel 0.55mm
5.55
Aluminium 0.70mm
2.31
Aluminium 0.90mm
2.96
Duraclad 1.7mm total
2.70
Drape curved roof - min. radius (m)
Steel 0.40mm
20
Steel 0.55mm
16
Aluminium 0.70mm
20
Aluminium 0.90mm
16
Duraclad 1.7mm total
20
Purlin spacings for drape curved roof (m)(1)
Steel 0.40mm
1.3
Steel 0.55mm
1.6
Aluminium 0.70mm
1.3
Aluminium 0.90mm
1.6
Duraclad 1.7mm total
1.2
Machine crimp curved - roof min. radius (mm)
Steel 0.40mm
400
Steel 0.55mm
400
Aluminium 0.70mm
n/a
Aluminium 0.90mm
n/a
Duraclad 1.7mm total
n/a
Unsupported overhang (2)(mm)
Steel 0.40mm
200
Steel 0.55mm
300
Aluminium 0.70mm
150
Aluminium 0.90mm
250
Duraclad 1.7mm total
150

(1) Recommended maximum purlin spacing at minimum radius

(2) Based on 1.1kN point load support, but not intended for roof access.

n/a – not available

Roll-forming & crimp curving facility at: Christchurch


Manufacturing location for Duraclad:
Auckland


Sheet lengths:
V-Rib is custom run to order.


Where long sheets are used consideration must be given to:

  • Special transportation licences for sheet lengths over 25m
  • Site access for special lifting equipment
  • Fixing techniques to accommodate thermal expansion.

Refer Section 2.1.3.4 of Technical Manual.

V-Rib Limite State Load / Span Capacity

(span in mm, distributed serviceability loads in kPa)

G550 Steel 0.40mm
Unrestricted Access / Roof
Restricted Access / Roof
Non-Access / Roof or Wall
Unrestricted Access / Roof
End Span
Internal Span
Serviceability
End Span
800
Internal Span
1100
Serviceability
3.5
Restricted Access / Roof
End Span
800
900
1100
1400
Internal Span
1200
1400
1700
1800
Serviceability
3.4
3.2
2.6
2.4
Non-Access / Roof or Wall
End Span
1700
1700
1900
Internal Span
2100
2500
2900
Serviceability
1.9
1.4
1.0
G550 Steel 0.55mm
Unrestricted Access / Roof
Restricted Access / Roof
Non-Access / Roof or Wall
Unrestricted Access / Roof
End Span
Internal Span
Serviceability
End Span
1100
Internal Span
1600
Serviceability
3.2
Restricted Access / Roof
End Span
1100
1300
1600
1700
Internal Span
1700
2000
2400
2500
Serviceability
3.1
2.7
2.2
2.0
Non-Access / Roof or Wall
End Span
2000
2300
2700
Internal Span
3000
3500
4000
Serviceability
1.4
1.0
0.8
5052, H36 Aluminium 0.70mm
Unrestricted Access / Roof
Restricted Access / Roof
Non-Access / Roof or Wall
Unrestricted Access / Roof
End Span
Internal Span
Serviceability
End Span
Internal Span
Serviceability
Restricted Access / Roof
End Span
800
900
Internal Span
1200
1300
Serviceability
2.5
2.4
Non-Access / Roof or Wall
End Span
1100
1400
1600
Internal Span
1700
2100
2400
Serviceability
1.4
1.3
1.0
5052, H36 Aluminium 0.90mm
Unrestricted Access / Roof
Restricted Access / Roof
Non-Access / Roof or Wall
Unrestricted Access / Roof
End Span
Internal Span
Serviceability
End Span
900
Internal Span
1400
Serviceability
2.8
Restricted Access / Roof
End Span
1000
1100
1300
1400
Internal Span
1500
1700
2000
2100
Serviceability
2.7
2.5
2.1
1.9
Non-Access / Roof or Wall
End Span
1700
1900
2300
Internal Span
2500
2900
3400
Serviceability
1.4
1.0
0.7
Duraclad 1.7mm (Note 4)
Unrestricted Access / Roof
Restricted Access / Roof
Non-Access / Roof or Wall
Unrestricted Access / Roof
End Span
Internal Span
Serviceability
Ultimate
End Span
Internal Span
Serviceability
Ultimate
Restricted Access / Roof
End Span
700
800
Internal Span
1100
1200
Serviceability
-
-
Ultimate
4.5
3.5
Non-Access / Roof or Wall
End Span
1100
1200
Internal Span
1500
1800
Serviceability
-
-
Ultimate
1.7
1.3
Notes
  1. In any category, spans above the maximum shown should not be used. Category 1 and 2 maximum spans are based on static point load testing as a guide, and further limited by practical experience of roof performance under dynamic foot traffic loads. Category 3 maximum spans are limited as a guide to achieving satisfactory appearance for wall cladding.
  2. Loads given are based on 5 screw fasteners/sheet/purlin.
  3. Loads given are limited to a maximum of 4.5 kPa. If design requirements exceed this limit, contact Dimond for specific advice.
  4. Duraclad
    – Serviceability Limit State loads are not applicable to the Duraclad material, as it does not experience permanent deformation.
    – System must include Safety Mesh if intended for use as a Restricted-Access roof. Refer Section 2.2.1.8.
  5. N/R = not recommended.
  6. End span capacities given in this table are based on the end span being 2/3 of the internal span.
  7. Design Criteria for Limit State Capacities
    1. Serviceability Limit State
      No deflection or permanent distortion that would cause unacceptable appearance, side lap leakage or water ponding, due to foot traffic point loads, inward or outward wind loads or snow loads.
    2. Ultimate Limit State
      No pull through of fixings or fastener withdrawal resulting in sheet detachment due to wind up-llift (outward) loads.
  8. System Design
    The span capacity of V-Rib is determined from the V-Rib Limit State Load/Span Capacity Chart using the section of the chart appropriate to the grade and type of material, and to the category of serviceability selected from the three categories below. Serviceability loads have been derived by test to the NZMRM testing procedures. To obtain an ultimate limit state load we recommend factoring the serviceability load up by 1.4 in-line with NZMRM guidelines.
    The capacities given do not apply for cyclonic wind conditions.

    Serviceability Requirements

    While these categories are given for design guidance to meet the serviceability limit state criteria, foot traffic point load damage may still occur if there is careless placement of these point loads.

    Unrestricted-access roof

    Expect regular foot traffic to access the roof for maintenance work and able to walk anywhere on the roof. No congregation of foot traffic expected.
    Restricted-access roof

    Expect occasional foot traffic educated to walk only on the purlin lines, in the profile pans, or carefully across two profile ribs. Walkways installed where regular traffic is expected, and “Restricted Access” signs placed at access points.
    Non-access roof or wall
    Walls or roofs where no foot traffic access is possible or permitted. If necessary, “No Roof Access” signs used.

  9. Wind Pressure Guide
    As a guide for no-specific design the following S.L.S. design loads in accordance with the MRM Roofing Code of Practice can be used for buildings less than 10m high, otherwise AS/NZS 1170.2 should be used
    Low wind zone = 0.68kPa, Medium wind zone = 0.93kPa, High wind zone = 1.32kPa, Very high wind zone = 1.72kPa and Extra high wind zone = 2.09kPa.

V-Rib Fastener Design



V-Rib should be screw fixed to either timber or steel purlins. The use of the appropriate length of 12g or 14g screw will ensure failure by screw pull out will not occur under loads within the scope of the Limit State Load / Span Capacity Chart.

Purlin Type
Roofing Rib Screw Length* (mm)
Roofing Rib Designation
Wall Cladding Pan Screw Length* (mm)
Wall Cladding Pan Designation
Timber
Roofing Rib Screw Length* (mm)
65
Roofing Rib Designation
T17 - 14 - 10 x 65 / T17 - 12 - 11 x 65 / RoofzipM6 x 50 HG-Z4
Wall Cladding Pan Screw Length* (mm)
50
Wall Cladding Pan Designation
RoofzipM6 x 50 HG-Z4
Steel
Roofing Rib Screw Length* (mm)
55
Roofing Rib Designation
Tek - 12 - 14 x 55
Wall Cladding Pan Screw Length* (mm)
20
Wall Cladding Pan Designation
Tek - 12 - 14 x 20

*If sarking or insulation is used over the purlins or for wall cladding fixing onto a cavity batten, into the stud, the screw length will need to be increased.

For screw size range and fastener / washer assembly refer Section 2.2.3.1 of Technical Manual.

The Limit State Load / Span Capacity Chart is based on 5 screw fasteners/sheet/purlin without the use of load spreading washers (except for Duraclad material, which must be fitted with profiled metal washers and 36mm EPDM seals).

Profiled metal washers are recommended for use:

  1. On end spans, or large internal spans where the Ultimate Limit State distributed load is limiting. Contact Dimond for specific advice in these design cases.
  2. When required to enable the fixing system to accommodate the thermal movement of long sheets – see Section 2.1.3.4 Thermal Movement of Technical Manual.
  3. Wherever the designer wishes to ensure the risk of fastener over-tightening will not cause dishing of the crest of the
  4. profile rib.

Use in serviceability categories (1) or (2) can allow the reduction of fasteners to 3 screw fasteners/sheet/purlin.
If this is done, the distributed load capacities given in the chart should be reduced using a multiplying factor of 0.6.

Long spans may require the specification and use of side lap stitching screws – see Section 2.3.2C Installation Information: Layout and Fastening of Technical Manual.

Design Example


Restricted access roof, 0.55mm G550 steel V-Rib has a maximum end span of 1600mm and a maximum internal span of 2400mm. The following distributed load capacities apply.

5 fasteners/sheet
3 fastener/sheet
End Span
5 fasteners/sheet
1600mm
3 fastener/sheet
1700mm
Internal Span
5 fasteners/sheet
2400mm
3 fastener/sheet
2400mm
Serviceability
5 fasteners/sheet
2.2kPa
3 fastener/sheet
1.3kPa

Fastener Layout Option

Terms & Conditions
Technical Manual
All Dimond Roofing CAD details can be found on EBOSS

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