PROVE the R™

When it is specified, prove it was installed.

An Association initiative to improve the quality, consistency and transparency of insulation installation evidence on New Zealand building projects. Identify a product’s R-value from what is actually on site.

Why it matters

Homeowners

Comfort and running costs depend on what is actually installed, not on what was quoted.

Builders and BCAs

Sign-off needs a quick way to confirm the specified R-values were the ones used.

Reputable installers

Evidence backed installs separate compliant work from poor practice, on a level playing field.

What a compliant install looks like

  • The installed R-value matches the specification.
  • Coverage and continuity meet the installation requirements for that product or system.
  • Workmanship aligns with the relevant standards, including NZS 4246:2016 for residential bulk insulation.
  • Records are sufficient for project QA, client assurance and any inspection queries.

The R-Value Evidence Pack

The Association recommends this as the minimum evidence set that builders and clients should expect on an insulation job.

  1. 1Product identification. Product name, R-value, thickness, and where it was installed.
  2. 2Batch and pack traceability. A photograph of the packaging showing the batch or pack identifiers.
  3. 3Delivery documentation. The delivery docket, invoice or equivalent.
  4. 4Install day photographs. The product installed, plus packaging and labels on site on the same day.
  5. 5Installer declaration. A statement that the work was installed as specified, or that any substitution was approved in writing.

How builders can use it

  • Include a no substitution without written approval clause in subcontract agreements.
  • Make the Evidence Pack a condition of final invoice approval or sign-off.
  • Keep Evidence Packs with the job QA records so inspection questions can be answered quickly.

A note on substitutions

Substitutions happen, through availability or a design change. Where one is proposed it should be identified early, approved in writing by the principal or contract administrator, and supported by evidence that the substituted solution still meets the project requirements.

The words and marks PROVE the R™ are the subject of an IAONZ New Zealand trademark application and must not be used to imply certification, compliance approval or endorsement by IAONZ unless that use has been expressly approved in writing by IAONZ.

The data behind it

The calculator reads a product table maintained by the Association from BRANZ appraisals.

Indicative only, never a certified figure.

Member commitment

Members commit to install in accordance with the Building Code and the relevant standards, and to operate a quality assurance process.

What membership means

Need an installer who does this

Every listed member commits to installing to NZS 4246:2016.

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