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What you need before you start ​

A short checklist for a smooth first H1 report.

An account ​

Thermly is used with your Thermly account. During open testing, access is invite-based: after you register you may be placed on a waitlist until an administrator approves your account. You sign in with email, and - where enabled - with Google or Apple.

The building's climate zone ​

H1 compares your building against a reference building for its climate zone. Have the site's NZ postcode to hand (Thermly looks up the zone) or know which of the six H1/AS1 6th edition zones (Appendix C) applies.

Your element areas - or a plan to measure them from ​

For each wall, roof and floor you need an area. Either:

  • a plan PDF to take off (recommended) - ideally with a floor plan, a roof plan, and a known dimension or scale bar so you can calibrate; or
  • the areas already measured, ready to enter.

See Working from a plan or entering areas.

The assemblies - or a sample to start from ​

Each element needs an assembly (its layer build-up). You can:

  • start from a sample assembly and refine it, or
  • build your own in the Assembly Builder from insulation, framing, linings, cladding and cavities.

It helps to know your intended insulation (batt R-values or product names), framing (timber or steel, size and spacing), linings and cladding. For a proprietary raft or supplied floor, have the manufacturer's project-specific R-value and its source document ready - see Supplied floors and rafts.

These appear on the report cover and headers, and can be left blank (they render as "Not specified"):

  • site address, client / owner, designer / architectural practice, consent reference;
  • Prepared by - the name and organisation of the person preparing the report, and the reviewer who will certify it.

You do not need ​

  • Any calculation setup - the method (isothermal planes, the reference building, surface resistances) is built in.
  • A product spreadsheet - the catalogue is sourced and searchable.
  • The standards themselves - Thermly implements H1/AS1 6th edition and NZS 4214:2006 for you. You remain the professional who reviews and certifies the result.

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