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Product sourcing and provenance ​

Every R-value in Thermly's catalogue can be traced to a source. This page explains where the product data comes from, how to see the source for any product, and what to check before you rely on a value.

The Product Catalogue: sourced products, each with a "Show source" link.

Where the R-values come from ​

Catalogue R-values are construction R-values (m²·K/W) per NZS 4214:2006, sourced, in order of preference, from:

  1. the manufacturer's published datasheet (a direct R-value);
  2. NZS 4214:2006 material tables (lambda values for common materials, from which R is derived by thickness ÷ lambda);
  3. ISO 6946 air-space resistances.

Some catalogue entries are specifier items with no thermal R-value (a building wrap, a fixing), and are marked as such.

Thermly does not take product data from competitor calculators or third-party estimating tools. The data is sourced from primary documents so its provenance is defensible.

Seeing a product's source ​

On the Product Catalogue page, each product row has a Show source link. Expand it to see:

  • the source document title (for example, a named datasheet);
  • the type of source (manufacturer datasheet, standard, or reference table);
  • the date it was retrieved;
  • any notes, and an Open source link to the document where one is available.

The same sourced catalogue backs the product picker in the Assembly Builder, so you always know what a layer's R-value rests on.

AI-assisted extraction, and why you still check ​

Many datasheet R-values are read into the catalogue with the help of AI extraction, which is fast and wide-reaching but not infallible. Thermly is explicit about this: in the Assembly Builder a banner reminds you that "Product R-values are AI-extracted from manufacturer datasheets and may contain errors - verify against the manufacturer's current datasheet before use."

This is the professional-tool relationship applied to data. Thermly sources and presents the value with its provenance; you confirm it against the current datasheet for the product you are actually specifying. Datasheets are revised, and a superseded R-value is a real risk on any tool.

Building Product Specifications ​

H1/AS1 6th edition introduces the MBIE Building Product Specifications framework, under which a product covered by a specification can be used to demonstrate compliance directly. As that framework beds in, it becomes the strongest form of provenance for a product's performance.

If a product is missing or wrong ​

  • Missing product or R-value: use Custom R-value on the layer and enter the figure from the datasheet with its basis.
  • A value that looks wrong: check Show source, compare against the current datasheet, and use a custom R if the catalogue is out of date. Product feedback can be sent from the app.

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