Case study three

In this case study, a product demonstrates compliance by following a Verification Method

A manufacturer is launching a new range of structural steel brackets for purlin, rafter, top and bottom plate and stud connections.

Step 1: Establish if this product needs to comply with the Building Code

The answer is yes, because the brackets provide structural stability. Therefore, they must comply with Building Code clause B1: Structure and clause B2: Durability.

Step 2: Establish the relevant Acceptable Solution or Verification Method

In this case, the manufacturer identifies that the relevant Verification Methods it needs to use in order to show compliance are:

• B1/VM1
• B2/VM1.

The Verification Method for B1 cites NZS 1170, the loadings standard in terms of B1: Structure.

The Verification Method for B2 involves providing evidence of in-service history or laboratory testing.

Step 3: Provide evidence

The manufacturer clearly identifies:

• the Building Code clauses against which compliance is claimed
• detailed scope and limitations for use of the product.

The manufacturer assembles the following technical information:

• product description
• calculations, test reports and records of in-service performance
• precise descriptions for the product’s use, installation and maintenance
• a description of the company and contact details.

Next, the manufacturer engages an independent structural engineer to review its compliance claims and the methods used to support those claims.

The engineer refers to the Verification Method for Building Code clause B1 which identified NZS 1170 in terms of structural loadings. The engineer:

• reviews the standard and identifies the relevant loadings that would be applied
• confirms the key facts about the steel; in particular, the grade and thickness
• checks the appropriate calculations
• establishes the brackets would meet the Building Code requirements, subject to some conditions of use.

Therefore, the engineer endorses the manufacturer’s claims. They provide details of their competence to undertake the review and to confirm these claims.

The manufacturer (or the engineer) assembles a product technical statement to summarise the need-to-know product information and evidence of compliance.

The manufacturer’s final task is to make sure that all the information that relates to the steel brackets is readily available to everyone involved in the building process.

It makes copies of all technical information, the product technical statement and the independent endorsement, and places this on the company’s website. The manufacturer has a procedure in place to ensure all references are current.