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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. Registration is self-serve: create a free account and you can start using Thermly immediately. 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. The free climate zone finder confirms a zone against the H1/AS1 territorial-authority table.

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.

Project Information collects only the details that vary per report, and they can be left blank (they render as "Not specified"):

  • site address, consent reference, and the building designer / architectural practice;
  • a free-text Notes box for anything worth recording on the report (for example which spaces are excluded from the thermal envelope as unheated).

The report author's name, organisation and role come from your Profile settings - set them once and every report is attributed to you, with a per-report override for the occasional job you prepare on someone else's behalf.

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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