Roofing

HYER STANDARD

PROCEDURE

Purpose and Scope

The purpose of this procedure is to ensure that roofing material and elements have been fabricated and installed as per the relevant project documentation, Australian Standards and in compliance with other Hansen Yuncken HYer Standards and procedures.

There are various types of roofing materials to consider, including but not limited to the following:

Metal/stone/timber cladding
Metal roof cladding
Metal Flashing and capping
Insulation
Roof access hatch

Responsibilities

PROJECT MANAGER

Ensuring design changes are assessed for constructability risks.
Ensure any design constructability risks are assessed, controlled, and documented in the Project’s Risk Register.
Ensuring any constructability risks identified are communicated to workers performing the work and the HY project team.

HY PROJECT TEAM

Obtaining and reviewing project documentation, drawings, and specifications.
Managing workflows to document RFIs and design changes.
Managing the project’s document registry and communicating documentation to relevant parties.
Communicating requirements for submittals, warranties, and inspection and test plans to Subcontractors and other parties as applicable.
Ensure nominated subcontract users are registered in the QA platform and invited to the Project Profile.
Ensuring relevant quality control pre-work checks are complete prior to starting works.
Ensuring any applicable hold and witness points are in place and adhered to.
Receiving and controlling submittals, warranties, and inspection and test plans.

SUBCONTRACTOR SUPERVISOR

Ensure personnel responsible for using the QA platform are registered and have means to access the platform via mobile or desktop devices.
Ensuring relevant quality control pre-work checks are complete prior to starting works.
Ensuring any applicable hold and witness points are adhered to.
Providing any required submittals, warranties, and inspection and test plans.

Quality Verification

Hansen Yuncken predominantly utilises Autodesk platforms (BIM360 and ACC) to carry out quality control checks and verifications. Subcontractor supervisors or nominated representatives must have a registered Autodesk account and be invited onto the Project Profile by the HY project team.

The Roofing Checklist in the QA platform are to be completed prior to and throughout the relevant stages of works. HY representatives are responsible for completing the header and site preparation sections. The subcontractor representatives are responsible for completing their respective sections respectively. All hold points must be adhered to and verified by the HY representative to proceed.

Guidance on the use of software for Subcontractor users can be accessed via the Onboarding Induction and Training Procedure.

Note: Defence Projects and select Government Projects may have unique requirements regarding Quality Control and the use of software packages to carry out verifications. The agreed methods and software packages will be determined at Project Commencement considering the specific project needs and client requirements.

Preparation

Project drawings and specifications will detail the locations and requirements for roofing installation. The latest revisions of drawings and specifications are to be referenced for the works, which are to be provided to the subcontractors carrying out the works.

Approvals

Submittals, samples, and materials are to be identified, reviewed, and approved by the respective responsible parties in accordance with project specifications prior to works beginning. Any changes are to be captured via appropriate channels for the project (e.g., Aconex Workflow) and communicated to workers.

The roofing, associated fixings, sealants and sarking materials are to be verified in accordance with the project drawings and specifications. The following items are to be confirmed:

Provide a sample of each type of roofing material, in the specified thickness, colour and finish.
Verify protective coating is the correct type/grade
Confirm that the structure has been approved to proceed with installing roofing
Subcontractor ITPs have been reviewed and approved by Hansen Yuncken.

Supporting Structure and Materials

Prior to the installation of any roofing materials the following items are to be confirmed:

Confirm that the roof structure and structural steel erection has been completed and approved to proceed with roofing installation and loading.
Confirm that the roofing subcontractor has accepted the roof structure and can proceed to install the specified roofing system as specified and approved.
Roofing material is correct type/profile and material thickness is in accordance with specified requirements.
Roofing material colour is in accordance with approved sample and free of damage.
Verify all bolts are checked and torque verified 24 hours after erection.
Sarking/ insulation material is in accordance with specified requirements and is correct R-rating.
Mesh & ancillary materials are in accordance with specified requirements.
Roof Anchors are in accordance with specified requirements.
Sealant is correct grade, type and colour.
Fixing type(s) are of correct grade/type – in accordance with specified and manufacturer’s requirements.
Guttering & downpipe materials/profile is in accordance with specified requirements.
Hold point: First roofing sheet or area has been approved by the Architect/Client.

Installation

Once the supporting structure has been accepted, materials have been verified, and roofing works may begin, the following items are to be verified:

Roofing surface is to correct grade and alignment.
Cast ins (brackets, anchors) have been provided and installed as detailed.
Penetrations (grilles, louvres etc.) are in correct location and size.
Perimeter safety handrails have been installed as per manufacturer requirements.
Roof mesh has been installed in accordance with HY Metal Roofing specification.
First roof sheet installed has been signed off by HY/Architect/ Client.
Insulation and sarking have been installed in accordance with specified requirements.
Roofing has been installed in accordance with AS 1562 and manufacturers specification.
Roofing fixings have been installed correctly at required spacings/location (for Wind load).
Roof anchors have been fixed to the roof structure in accordance with specified requirements and as detailed.
Sealant has been installed in accordance with specified requirements.
Flashings have been installed in accordance with specified requirements and correct cover achieved
Guttering has been installed with correct grades/falls.
Downpipes have been installed correctly at specified locations.
Guttering & downpipes have been correctly sealed.
Penetrations (grilles, louvres etc.) are in correct location and size.
Skylights are installed as documented, type, size, location, flashings.
Completed roof is free of all waste materials with swarf & grindings removed.

Specifications and Compliance

Current Project Specifications are to be used to confirm all approvals, samples, and submittals required for the project. Project Specification requirements are to be entered into the Project’s Compliance Schedule.

The following approvals may be required:

Roof structure and Structural Steel Erection is complete and approved for loading of roofing materials.
First roof sheet installed has been signed off by HY/Architect/ Client
Subcontractors ITP

The following supporting documentation or submissions may be required from the subcontractor:

Roofing material certificate of compliance.
Sarking/insulation certificate of compliance.
Roof anchor certificate of compliance
Roofing Subcontractor completed QC checklist/record or ITP.
Material and Installation warranties.

Hold/Witness Points to be adhered to throughout works:

Roof structure and Structural Steel Erection is complete and approved for loading of roofing materials.
Roofing Structure has been accepted by roofing subcontractor.
Roof and wall insulation prior to covering.
First roof sheet installed has been signed off by HY/Architect/ Client

Definitions

ITP – Inspection and Test Plan

NCC – National Construction Code

RFI – Request for Information

References

AS 1562.1 – Design and installation of metal roof and wall cladding Metal.
AS 4040.0 – Methods of testing sheet roof and wall cladding.
AS 4040.1 – Methods of testing sheet roof and wall cladding, Method 1: Resistance to concentrated loads.
AS 4040.2 – Methods of testing sheet roof and wall cladding Resistance to wind pressures for non-cyclone regions.
AS/NZS 1170.1 – Structural Design Actions – Permanent, imposed, and other actions
AS/NZS 1170.2 – Structural design actions Wind actions.
AS/NZS 1170.3 – Structural design actions Snow and ice actions.
AS/NZS 4389 – Roof safety mesh.
NCC – Volume 2, Part 3.5.1 Roof Cladding

Associated Checklists and Documents

Roofing Checklist (Autodesk)
Working at Height Procedure and HYer Standard