Dimondek® 400

Standard Colours

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

Black
Minimum pitch
Rib type
Concealed Clip
Ribs per sheet
3
Width
406mm cover
412mm sheet
Suitable for
Residential
Light commercial
Manufactured in
Auckland
Hamilton
Wellington
Christchurch
Terms & Conditions

Dimondek® 400 Performance




Dimondek® 400 adds architectural interest to your roof, with its broad angular ribs and wide pans it brings modern styling to your roof. The concealed fix system provides a strong clean finish with no visible fixings. Ideally suited for modern contemporary homes, DD400 is the ultimate bold statement in roofs. DD400 can be rolled onsite, meaning longer lengths with no steps in the roof, giving greater design capability.

Cover (mm)
Sheet width (mm)
Minimum Pitch
406
Sheet width (mm)
412
Minimum Pitch
3º (approx. 1:20)

All dimensions given are nominal

Sheet Tolerances
Sheet width: ±5mm
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 Thickness (BMT)
Steel 0.55mm
Steel 0.75mm
Aluminium 0.90mm
Copper 0.55mm
Nominal weight/lineal metre (kg/m)
Steel 0.55mm
2.77
Steel 0.75mm
3.73
Aluminium 0.90mm
1.48
Copper 0.55mm
2.99
Drape curved roof - min. radius (m)
Steel 0.55mm
70
Steel 0.75mm
70
Aluminium 0.90mm
70
Copper 0.55mm
70
Purlin spacings for drape curved roof (m)(1)
Steel 0.55mm
1200
Steel 0.75mm
1500
Aluminium 0.90mm
900
Copper 0.55mm
1000
Machine crimp curved - roof min. radius (mm)
Steel 0.55mm
n/a
Steel 0.75mm
n/a
Aluminium 0.90mm
n/a
Copper 0.55mm
n/a
Unsupported overhang (2)(mm)
Steel 0.55mm
250
Steel 0.75mm
300
Aluminium 0.90mm
200
Copper 0.55mm
200

*Dimondek 400 is available in Copper ex Auckland only, subject to coil availability.

**To achieve a high level of appearance on the completed roof, it is important that the purlin layout alignment is laid within the tolerances as stated in Section 2.4.2.3.1.

(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 facilities for Dimondek® 400 at: Auckland, Hamilton, Wellington, Christchurch, and a mobile machine based in Hamilton which can be moved to site as required.


Sheet lengths:
DD400 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. in Technical Manual
  • Possibility of manufacturing sheets on site – sheet lengths up to 100m long are possible when rolled on site.

DD400 Limit State Load / Span Capacity

(span in mm, distributed ultimate loads in kPa)

G300 Steel 0.55mm
Unrestricted Access / Roof
Restricted Access / Roof
Non-Access / Roof or Wall
Unrestricted Access / Roof
End Span
Internal Span
Ultimate
End Span
800
Internal Span
1200
Ultimate
2.0
Restricted Access / Roof
End Span
900
1100
Internal Span
1300
1600
Ultimate
2.0
1.7
Non-Access / Roof or Wall
End Span
1100
1400
Internal Span
1700
2100
Ultimate
1.6
1.1
G300 Steel 0.75mm
Unrestricted Access / Roof
Restricted Access / Roof
Non-Access / Roof or Wall
Unrestricted Access / Roof
End Span
Internal Span
Ultimate
End Span
800
1000
Internal Span
1200
1500
Ultimate
2.0
2.0
Restricted Access / Roof
End Span
1100
1300
1500
Internal Span
1600
1900
2200
Ultimate
2.0
2.0
1.7
Non-Access / Roof or Wall
End Span
1500
1700
Internal Span
2300
2600
Ultimate
1.6
1.2
5052 H36 Aluminium 0.70mm
Unrestricted Access / Roof
Restricted Access / Roof
Non-Access / Roof or Wall
Unrestricted Access / Roof
End Span
Internal Span
Ultimate
End Span
Internal Span
Ultimate
N/R
N/R
Restricted Access / Roof
End Span
600
Internal Span
900
Ultimate
1.8
Non-Access / Roof or Wall
End Span
700
900
Internal Span
1000
1300
Ultimate
1.7
1.2
5052 H36 Aluminium 0.90mm
Unrestricted Access / Roof
Restricted Access / Roof
Non-Access / Roof or Wall
Unrestricted Access / Roof
End Span
Internal Span
Ultimate
End Span
600
Internal Span
900
Ultimate
2.0
Restricted Access / Roof
End Span
700
900
Internal Span
1000
1300
Ultimate
2.0
1.8
Non-Access / Roof or Wall
End Span
900
1100
Internal Span
1400
1700
Ultimate
1.6
1.1
1/2 hard Copper 0.55mm
Unrestricted Access / Roof
Restricted Access / Roof
Non-Access / Roof or Wall
Unrestricted Access / Roof
End Span
Internal Span
Ultimate
End Span
700
Internal Span
1000
Ultimate
2.0
Restricted Access / Roof
End Span
700
900
Internal Span
1100
1400
Ultimate
2.0
1.7
Non-Access / Roof or Wall
End Span
1000
1300
Internal Span
1500
1900
Ultimate
1.6
1.0

*Subject to availability
^ See point 5 in notes

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 clip fastening every rib at every purlin.
  3. Loads given are limited to a maximum of 2.2 kPa U.L.S. If design requirements exceed this limit, the push on Dimond wind clamps can be installed to double the wind uplift load.
  4. N/R = not recommended.
  5. For the purposes of serviceability design, the serviceability limit, limited by permanent rib deformation, occurs essentially at the same load as ultimate failure which is the point of disengagement of the roof with the clip.
  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 Dimondek® 400 is determined from the Dimondek® 400 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. It is recommended that to obtain a dependable design strength capacity for the ultimate limit state, a reduction factor of Ø = 0.8 is applied.
    The capacities given do not apply for cyclonic wind conditions
  9. 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.

  10. Wind Pressure Guide
    As a guide for non-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.

DD400 Fastener Design



Dimondek® 400 is clip-fastened to either timber or steel purlins. The use of the appropriate type and length of fastener for clip
fixing will ensure failure by fastener pull out will not occur under loads within the scope of the Limit State Load / Span Capacity
Chart.

Purlin Type
Clip Fastener
Timber
Clip Fastener
10g x 45mm timbertite wafer head screw or T17 M4x75mm pan head for fixing through Cavibats and 17.5mm thick ply
Steel
Clip Fastener
10g x 16mm wafer head screw

*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 refer Section 2.2.3.1 of Technical Manual.

Underslung Fixing

  • When using Dimondek® 400 as an underslung roof, the ribs are required to be fixed under the steel structure, using a Dimond® stainless steel tee bolt and stainless steel clip with neo’s on every rib.
  • There should be 1 row of clips on each structural member, each alternating side of the flange to avoid the Dimondek® 400 falling off the structural steel.
  • It is important to pre drill a 5mm diameter hole, through the centre of each rib of Dimondek® 400, within 10mm of the edge of the structural steel member.
  • For roofing lengths over 18m, an allowance for thermal expansion must be made.
  • From the underside the tee bolt is then passed through the hole in the Dimondek® 400, a neo seal fitted, then the clip is secured against and on top of the flange of the structural steel, before a neo seal washer and lock nut are tightened down, to compress the seals and hold the clip in place.

The Limit State Load / Span Capacity Chart is based on every rib being clip fastened to every purlin.



Design Example

Restricted access roof, 0.55mm G300 steel Dimondek 400 has a maximum end span of 1100mm and a maximum internal span of 1600mm. The following distributed load capacities apply.

End Span
Internal Span
Ultimate Span
1100mm
Internal Span
1600mm
Ultimate Span
1.4 kPa
Terms & Conditions
Technical Manual
All Dimond Roofing CAD details can be found on EBOSS

Product Technical Statement



To help you get through the building consent process as quickly as possible, we have developed the Product Technical Statement (PTS) downloads to make it quick and easy for both Architects and Home Owners to access the documentation required.

The PTS downloads hold all of the information that the council requires for a building consent where Dimond product is specified.

Download Product Technical Statement

Product Brochure

Need a brochure for this profile? Here you can download one with the basic information and details you need during the decision process.

Download Product Brochure

Below you can download our homeowner’s brochure which includes some of our profiles and basic product information for homeowners when re-roofing or building new.

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