ISO 10077-2-2017 amd1-2024 PDF

Full title and description

ISO 10077-2:2017/Amd 1:2024 — Thermal performance of windows, doors and shutters — Calculation of thermal transmittance — Part 2: Numerical method for frames — Amendment 1. This published amendment updates and clarifies aspects of the numerical (finite-element) calculation methods used to determine frame thermal transmittance (U-value) as specified in ISO 10077-2:2017; the document is available in PDF form as the official ISO amendment.

Abstract

This amendment (Amendment 1:2024) to ISO 10077-2:2017 provides technical changes and clarifications to the numerical method for frames used to calculate the thermal transmittance of fenestration frames. It is intended to be used alongside ISO 10077-2:2017 and does not by itself replace the base part; instead it modifies or supplements specific clauses, figures, tables or calculation details in the 2017 edition.

General information

• Status: Published (Amendment to ISO 10077-2:2017)
• Publication date: December 2024 (published 16 December 2024 / edition 3 listing).
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 91.060.50 (Doors and windows); 91.120.10 (Thermal insulation of buildings)
• Edition / version: Edition 3 (ISO listing shows this amendment as edition 3 of the consolidated record)
• Number of pages: 17 pages (amendment document)

Basic bibliographic and lifecycle information as listed by ISO and major standards resellers.

Scope

This amendment applies to ISO 10077-2:2017 (Part 2: Numerical method for frames) and provides changes, clarifications or additions to the numerical procedures used to compute frame U-values. It is intended to improve consistency of modelling practice, address identified ambiguities in the 2017 text, and ensure that frame calculations used for compliance, product data and comparative assessments are based on a consistent set of instructions. Users should apply the amendment together with the base 2017 document (i.e., read the amended clauses in context).

Key topics and requirements

• Formal amendment to the numerical method (finite-element / numerical modelling) provisions of ISO 10077-2:2017.
• Clarifications to calculation steps, boundary conditions and model geometry where the original text was ambiguous or needed refinement.
• Updates or corrections to formulae, tables or examples contained in the 2017 edition (as typical for an ISO amendment).
• Guidance to ensure consistent treatment of material thermal properties, contact resistances and discretisation/mesh requirements for frame models.
• Small editorial and technical corrections intended to improve reproducibility of frame U-value calculations.

Note: the amendment document itself is relatively short (17 pages) and therefore focuses on targeted changes rather than a full revision; amendments typically add, correct or clarify specific clauses rather than reissuing the whole standard.

Typical use and users

This amendment is used by fenestration manufacturers, thermal performance engineers, energy assessors, test laboratories, compliance specialists, software developers of thermal-calculation tools and standards bodies who perform or rely on numerical calculations of frame thermal transmittance. It is intended for professionals who already use ISO 10077-2:2017 and need to apply the latest technical clarifications or corrections to their frame models and reported U-values.

Related standards

Directly related documents include ISO 10077-2:2017 (the base Part 2 numerical-method standard) and ISO 10077-1 (Part 1: general / simplified methods). More generally, ISO 10211 (thermal bridges in building construction — detailed calculations) and regional/adopted versions (for example EN ISO 10077-2) are often used alongside ISO 10077 series when assessing thermal performance of building components.

Keywords

thermal performance, windows, doors, shutters, thermal transmittance, U-value, frames, numerical method, finite element, thermal bridge, ISO 10077-2, amendment 2024

FAQ

Q: What is this standard?

A: It is Amendment 1 (2024) to ISO 10077-2:2017, the international standard that specifies the numerical method for calculating the thermal transmittance (U-value) of fenestration frames. The amendment updates or clarifies parts of the 2017 text.

Q: What does it cover?

A: It covers targeted changes to the numerical calculation procedures in Part 2 — for example, clarifications to modelling instructions, corrections to specific clauses or figures, and improvements intended to make frame U-value calculations more consistent and reproducible when using ISO 10077-2:2017.

Q: Who typically uses it?

A: Fenestration product designers and manufacturers, energy assessors, independent testing laboratories, compliance authorities, and software developers who implement the ISO 10077 numerical methods for frames use this amendment together with the base standard.

Q: Is it current or superseded?

A: The amendment was published in December 2024 and is the current published amendment to ISO 10077-2:2017; it does not supersede the whole 2017 standard but modifies it — apply the amendment together with ISO 10077-2:2017. For the authoritative status and publication date see the ISO entry for the amendment.

Q: Is it part of a series?

A: Yes. ISO 10077 is a multi-part series on thermal performance of windows, doors and shutters — notably Part 1 (general/simplified methods) and Part 2 (numerical method for frames). The amendment applies specifically to Part 2.

Q: What are the key keywords?

A: Thermal transmittance, U-value, frames, fenestration, numerical method, finite element, thermal bridge, ISO 10077-2, amendment 2024.