Heritage Tray^®

Heritage Tray^® Performance

Heritage Tray® markets itself as an elegant, economical and flexible roofing profile. Heritage Tray® requires no additional plywood substrate thus reducing costs. Additionally, it can be roll formed on site, an attractive logistical option for larger construction projects.

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

Roll-forming facilities at: Auckland, Christchurch and Invercargill


Curving facilities: n/a


Sheet lengths: Heritage Tray is custom run to order.

Where long sheets are used, consideration must be given to:

• Special transportation licences
• Should be run on-site
• Site access for special lifting equipment
• Fixing techniques to accommodate thermal expansion

**NOTE
Photovoltaic laminates (PVL’s) can be installed on to this profile at an additional cost when the cladding is completed and other trade have finished or it can be installed at a later date.
Laminates are 348mm wide and available in 5.910mm and 2.585mm lengths. Lead time of 16 weeks
Laminates cannot be installed on raking sections of roofs

The Dimond Roofing Heritage Tray profile is only available in a fixed cover width, and cannot be manually folded. When the profile is used as wall cladding, careful attention is required to sheet set-out and sheet width tolerances to ensure the sheet modules align to wall openings.

Oil Canning

Oil Canning is the visible waviness in the flat areas of metal roofing and walling. Oil canning produces an aesthetic effect inherent in standing seam tray profiles and profiles/flashings with wide flat elements. It does not cause detriment to product performance.

Oil canning can occur during the forming and installation processes and during thermal expansion of the roof sheeting during its life cycle. The effect can be more or less pronounced depending on differing light and sun angle conditions and the coating gloss levels.

For Heritage Tray, oil canning can be reduced by the vented roof underlay (e.g. Tyvek Metal), in addition, backer rods under the tray can also be used.

There are several options to reduce the oil canning effect in tray-type profiles and flashings, for example

a) increasing the thickness of the material

b) using stiffening swages in wide flat elements

c) limiting flat elements to less than 150mm width.

For further information, please refer to the New Zealand Metal Roof and Wall Cladding Code of Practice, Section 12.3.

Heritage Tray® Limit State Load / Span Capacity

(span in mm, distributed ultimate load in kPa)

Notes

1. Category 1 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. Loads given are based on 4 screw fasteners/sheet/purlin.
2. Loads given are based on 1 clip per purlin, and alternative (second) purlin clipping, i.e. hit 1, miss 1. Clips are required to be fitted to all end and valley purlins, under any situation.
3. Loads given are limited to a maximum of 4.7kPa. If design requirements exceed this limit, Contact Dimond Roofing for specific advice.N/R = not recommended.
4. End span capacities given in this table are based on the end span being the same as the internal span.
5. Design Criteria for Limit State Capacities
   1. Ultimate Limit State
      No pull through of fixings or fasteners withdrawal resulting in sheet detachment due to wind up-lift (outward) loads.
6. System Design
   The span capacity of Heritage Tray is determined from the Heritage Tray Limit State Load/Capacity Chart using the section of the chart appropriate to grade and type of material, and to the category of serviceability selected from the two 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 cyclone 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
   Expected regular foot traffic to access the roof for maintenance work and able to walk anywhere on the roof. No congregation of foot traffic expected.
   
   
7. 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.

Heritage Tray®Fastener Design

Fasteners that are used to secure Heritage Tray clip down as a roof cladding must penetrate into the purlin a minimum of 30mm for timber and 6mm for steel purlins. For wall cladding, the clip fasteners must be long enough to pass through the cavity batten and into the main frame by 30mm for timber and 6mm for steel.

Design

Clip fasteners must be fixed to all periphery edges of all roofs in areas of High to Extra High Wind Zones.


Minimum pitch for Heritage Tray is 3 degrees.

Heritage Tray is not suitable for use in SED (Specific Engineering Design) Wind Zones.

Fastener Layout Options

Alternate clipping - 500mm purlin centres - Low - High Zones

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.

Product Data Sheet

For specific design by profile please refer to the Technical Manual Section 2.1.4 or download the data sheet below

Product Brochure

Need a brochure for one of our roofing profiles? Here you can download one for each of our profiles with the basic information and details you need during the decision process.

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.