Description

The certificate holder: Fletcher Steel Ltd - t/as Dimond Roofing.

Dimond Advanced Roofing Systems are warm roof system(s) consisting of multiple components as below:

1.The Advanced Standard System:

• Dimond Base Sheet
• Dimond Lap Seal Tape
• Dimond Post and Rail System
• Dimond BIB Insulation
• Dimond Underlay
• Dimond Top Sheet

2.The Dimond Advanced Vented and Advanced Non-Vented Systems:

• Dimond Base Sheet
• Dimond Vapour Barrier
• Dimond PIR Insulation Board
• Dimond Underlay
• Dimond Vented Roof Rail (for Vented System)
• Dimond Top Sheet

The Dimond Advanced Standard System is a composite post and rail warm roof system.

The Dimond Advanced Vented & Advanced Non-Vented Systems are composite warm roof systems.

Scope

1. The Dimond Advanced Roofing Systems are certified for buildings where the roofing system:

• a) Is specifically designed by a Chartered Professional Engineer:
  • i. for the design actions specified in Verification Method B1/VM1 and;
  • ii. In accordance with the relevant Installation Guide(s):
    • Dimond Advanced Roofing Systems Installation Guide Advanced Standard System, Version 1.0, June 2024 and with reference to:
    • Ash & Lacy Spacer Systems System Handbook Issue No. 001, June 2016.
    • Holmes Report 149561.00 LE 0325 Ashgrid System NZ Table, 22 May 2025.
    • Holmes Report 149561.00 LE 0625 Ashgrid system seismic design values v1.1., 23 July 2025.
    • Dimond Advanced Roofing Systems Installation Guide Advanced Non-Vented System, Version 1.0, June 2024.
    • Dimond Advanced Roofing Systems Installation Guide Advanced Vented System, Version 1.0, June 2024, and;
  • iii. with reference to the applicable PTS (refer to Section12), specifically with reference to the maximum allowable spans and fixings (type and spacings), and;
• b) slope is not less than 3 degrees (except for Dimond Corrugate which shall be not less than 8 degrees) and;
• c) Is located in any exposure zone as specified in NZS3604 (except microclimates).

2. Exposure of underlays and vapour barriers incorporated in a Dimond Advanced Roofing System to UV and weather during construction shall be not greater than the times specified in section 12.

3. Compliance with H1 shall be demonstrated using the R-values or thermal conductivity values specified in Section 12, using:

• a) the calculation method in Acceptable Solutions H1/AS1 or H1/AS2 (as applicable) or
• b) the modelling method in Verification Methods H1/VM1 or H1/VM2 (as applicable).

4. The designer shall certify that the design is in accordance with the conditions and limitations of this certificate.

5. The roof substructure is outside the scope of this specification.