ISO 9869-1-2014 PDF

Full title and description

ISO 9869-1:2014 — Thermal insulation — Building elements — In‑situ measurement of thermal resistance and thermal transmittance — Part 1: Heat flow meter method. This international standard specifies the heat‑flow‑meter (HFM) technique for on‑site measurement of thermal resistance (R) and thermal transmittance (U) of plane building components (primarily opaque elements with through‑thickness heat flow), and gives requirements for apparatus, calibration, installation, measurement, data analysis, correction of systematic errors and reporting.

Abstract

Describes the heat flow meter method for in‑situ measurement of thermal transmission properties of plane building elements. The standard covers measurement of thermal resistance (R) and conductance, and — where environmental temperatures are well defined — total thermal resistance RT and transmittance U. It addresses equipment, calibration, test installation and procedure, data analysis (including corrections and uncertainty) and reporting format.

General information

• Status: Published — active edition (confirmed on review).
• Publication date: 2014 (Edition 1 — ISO record shows 2014‑08; some catalogues record publication 29 July 2014).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 91.120.10 — Thermal insulation of buildings / Thermal performance and energy use in the built environment.
• Edition / version: Edition 1 (2014).
• Number of pages: 36 pages (ISO published pagination).

Scope

Specifies the heat flow meter (HFM) method for in‑situ measurement of thermal resistance and transmittance of plane building components that are essentially perpendicular to the heat flow and have no significant lateral heat flow. The method is applicable to quasi‑homogeneous layered components when local inhomogeneities near the meter are small compared with the meter dimensions and are not thermal bridges detectable by infrared thermography. The part defines apparatus and calibration, installation of sensors, measurement procedures for on‑site tests, data correction for dynamic heat storage effects and recommended reporting.

Key topics and requirements

• Definition of measurable properties: surface‑to‑surface thermal resistance R, thermal conductance Λ, total thermal resistance RT and U‑value (environment to environment) where conditions permit.
• Apparatus and calibration: requirements for HFM sensors, calibration procedures and verification of instrument performance before and after tests.
• Installation and mounting: correct placement and thermal contact of heat‑flow sensors and temperature sensors on both faces of the element; avoidance of thermal bridges and lateral heat flow.
• Measurement procedure: recommended test durations, data sampling and analysis rules. The standard gives guidance on minimum analysis periods and condition checks to limit dynamic storage effects (examples in the text include multi‑day test durations and specific acceptability checks).
• Data analysis and corrections: methods to correct for heat storage and systematic errors, and procedures to estimate measurement uncertainty.
• Reporting: required test metadata, instrument calibration records, environmental conditions, analysis period and final R/U results with uncertainty and notes on compliance.
• Annexes: normative and informative annexes provide additional examples, calculation notes and uncertainty examples (annex structure indicated in the standard).

Typical use and users

Used by building physicists, energy assessors, test laboratories, façade and roof manufacturers, retrofit specialists, HVAC and building services engineers, researchers and regulators for on‑site verification of thermal performance and for validation of calculated U‑values. Typical applications include in‑situ verification of wall, roof and floor assemblies, pre‑ and post‑retrofit performance checks, and research field campaigns.

Related standards

ISO 9869‑1:2014 is part of the ISO 9869 series for in‑situ thermal measurements. Related documents include ISO 9869‑2 (Infrared method for frame‑structure dwellings, 2018) and ISO 9869‑3 (Probe insertion method, 2023). The standard refers to background standards used for definitions and laboratory methods (for example ISO 7345 for U‑value definition and ISO 8990 for guarded/ calibrated hot box laboratory methods). Earlier edition ISO 9869:1994 was withdrawn and replaced by this part‑series.

Keywords

Thermal insulation, in‑situ measurement, heat flow meter, heat‑flow meter (HFM), thermal resistance, R‑value, U‑value, thermal transmittance, building elements, measurement uncertainty, on‑site testing, calibration, data correction.

FAQ

Q: What is this standard?

A: ISO 9869‑1:2014 is an international standard that specifies the heat‑flow‑meter (HFM) method for in‑situ measurement of thermal resistance and transmittance of plane building elements, including apparatus, calibration, installation, measurement, data analysis and reporting.

Q: What does it cover?

A: It covers the HFM measurement technique for opaque, planar building elements (walls, roofs, floors) with through‑thickness heat flow, including requirements for sensors and calibration, installation of meters and temperature sensors, recommended measurement durations and acceptance checks, corrections for heat storage effects, uncertainty estimation and reporting formats.

Q: Who typically uses it?

A: Building physicists, energy auditors, test laboratories, product manufacturers, retrofit assessors, researchers and regulatory bodies use the standard for on‑site verification of thermal performance and for research and quality assurance.

Q: Is it current or superseded?

A: ISO 9869‑1:2014 is the current part‑1 edition published in 2014; the ISO record shows the publication as the 2014 edition and notes the document was reviewed and confirmed (checked) in 2025, so this edition remains current. The original ISO 9869:1994 was withdrawn and superseded by the 2014 part‑series.

Q: Is it part of a series?

A: Yes — ISO 9869 is now a multi‑part series. Part 1 covers the heat‑flow‑meter method (this document), Part 2 covers infrared methods for frame‑structure dwellings (2018) and Part 3 covers the probe insertion method (2023). Each part addresses a different in‑situ measurement technique.

Q: What are the key keywords?

A: Key keywords include: heat flow meter, in‑situ measurement, thermal resistance (R), thermal transmittance (U), thermal insulation, building elements, calibration, measurement uncertainty, on‑site testing.