Brownbuilt 900

Standard Colours

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

Black
Minimum pitch
Rib type
High
Ribs per sheet
7
Width
900mm cover
960mm sheet
Suitable for
Residential
Light commercial
Commercial
Manufactured in
Auckland
Terms & Conditions

Brownbuilt 900 Performance


Brownbuilt 900 has been designed with strong ribs that resist buckling under concentrated loads reducing the chance of damage on roofs where foot traffic is common.


Equally useful as a wall cladding, Brownbuilt 900’s aesthetic appeal can be even further enhanced by inverting the profile to create Brownbuilt 900 Reverse Run.


BB900 Reverse Run Profile (for wall cladding only). Lapped Sheets Shown Dotted.

Cover (mm)
Sheet Width (mm)
Minimum Pitch
900
Sheet Width (mm)
960
Minimum Pitch
3º (approx. 1:20)

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 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
Steel 0.75mm
Aluminium 0.7mm
Aluminium 0.9mm
Stainless Steel
Duraclad 1.7mm (total thickness)
Nominal weight / lineal metre (kg/m) options
Steel 0.40mm
4.12
Steel 0.55mm
55.55
Steel 0.75mm
7.47
Aluminium 0.7mm
2.31
Aluminium 0.9mm
2.96
Stainless Steel
5.36
Duraclad 1.7mm (total thickness)
2.90
Drape curved roof - min. radius (m)
Steel 0.40mm
n/r
Steel 0.55mm
90
Steel 0.75mm
90
Aluminium 0.7mm
n/r
Aluminium 0.9mm
90
Stainless Steel
n/r
Duraclad 1.7mm (total thickness)
24
Purlin spacings for drape curved roof (mm) (1)
Steel 0.40mm
n/r
Steel 0.55mm
2.4
Steel 0.75mm
2.4
Aluminium 0.7mm
n/r
Aluminium 0.9mm
2.4
Stainless Steel
n/r
Duraclad 1.7mm (total thickness)
1.2
Machine crimp curved - roof min. radius (mm)
Steel 0.40mm
n/a
Steel 0.55mm
n/a
Steel 0.75mm
n/a
Aluminium 0.7mm
n/a
Aluminium 0.9mm
n/a
Stainless Steel
n/a
Duraclad 1.7mm (total thickness)
n/a
Unsupported overhang (2)
Steel 0.40mm
250
Steel 0.55mm
350
Steel 0.75mm
450
Aluminium 0.7mm
200
Aluminium 0.9mm
300
Stainless Steel
350
Duraclad 1.7mm (total thickness)
200

(1) Recommended maximum purlin spacing at minimum radius

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

n/r – not recommended

n/a – not available

Roll-forming facility at: Auckland



Manufacturing location for Duraclad:
Auckland



Sheet lengths:
BB900 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 the Technical Manual.

BB900 Limit State Load/Span Capacity

(span in mm, distributed serviceability loads in kPa)

G550 Steel 0.4mm
Unrestricted Access / Roof
Restricted Access / Roof
Non-Access / Roof or Wall
Unrestricted Access / Roof
End Span
Internal Span
Serviceability
End Span
800
Internal Span
1200
Serviceability
4.0
Restricted Access / Roof
End Span
1100
1300
1500
Internal Span
1600
1900
2200
Serviceability
3.3
2.6
2.0
Non-Access / Roof or Wall
End Span
1500
1700
1900
Internal Span
2300
2600
2900
Serviceability
1.8
1.6
1.2
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
1600
Internal Span
2400
Serviceability
3.7
Restricted Access / Roof
End Span
1700
2000
2300
Internal Span
2500
3000
3400
Serviceability
3.5
2.7
2.0
Non-Access / Roof or Wall
End Span
2400
2500
2700
Internal Span
3500
3800
4100
Serviceability
1.9
1.7
1.5
G550 Steel 0.75mm
Unrestricted Access / Roof
Restricted Access / Roof
Non-Access / Roof or Wall
Unrestricted Access / Roof
End Span
Internal Span
Serviceability
End Span
2000
Internal Span
3000
Serviceability
4.0
Restricted Access / Roof
End Span
2100
2400
2700
Internal Span
3200
3600
4000
Serviceability
3.8
3.1
2.3
Non-Access / Roof or Wall
End Span
2800
3000
Internal Span
4200
4600
Serviceability
2.0
1.3
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
900
Internal Span
1300
Serviceability
3.1
Restricted Access / Roof
End Span
900
1100
Internal Span
1400
1700
Serviceability
2.8
2.2
Non-Access / Roof or Wall
End Span
1200
1400
1600
Internal Span
1800
2100
2400
Serviceability
2.0
1.5
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
Serviceability
End Span
1300
Internal Span
2000
Serviceability
3.8
Restricted Access / Roof
End Span
1400
1600
1900
Internal Span
2100
2400
2800
Serviceability
3.6
2.8
2.1
Non-Access / Roof or Wall
End Span
1900
2200
2800
Internal Span
2900
3300
3700
Serviceability
2.0
1.5
1.2
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
N/R
N/R
Restricted Access / Roof
End Span
600
800
Internal Span
900
1200
Serviceability
-
-
Ultimate
4.5
4.5
Non-Access / Roof or Wall
End Span
900
110
1400
Internal Span
1300
1700
2100
Serviceability
-
-
-
Ultimate
4.5
3.2
2.0
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 6 screw fasteners/sheet/purlin.
  3. Loads given are limited to a maximum of 4.0 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 of Technical Manual
  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 Brownbuilt 900 is determined from the Brownbuilt 900 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.

    1. 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.
    2. 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.
    3. 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 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.

BB900 Fastener Design


Brownbuilt 900 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)
75
Roofing Rib Designation
T17 - 14 - 10 x 75
Wall Cladding Pan Screw Length* (mm)
50
Wall Cladding Pan Designation
RoofzipM6 x 50 HG-Z4
Steel
Roofing Rib Screw Length* (mm)
65
Roofing Rib Designation
Tek - 14 - 10 x 65
Tek - 12 - 14 x 68
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 6 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 in Technical Manual.
  3. Wherever the designer wishes to ensure the risk of fastener over-tightening will not cause dishing of the crest of the 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 0.5.



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


Design Example



Restricted access roof, 0.55mm G550 steel Brownbuilt 900 has a maximum end span of 2400mm and a maximum internal span of 3400mm. The following distributed load capacities apply.

3 fasteners/sheet
6 fastener/sheet
End Span
3 fasteners/sheet
2300mm
6 fastener/sheet
2300mm
Internal Span
3 fasteners/sheet
3400mm
6 fastener/sheet
3400mm
Serviceability
3 fasteners/sheet
2.0 kPa
6 fastener/sheet
1.0kPa

Fastener Layout Options



Terms & Conditions
Technical Manual

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If you have any questions regarding the details below please contact one of our technical team on 0800 ROOFSPEC.

Product Technical Statement




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