ISO 13785-2:2002
Reaction-to-fire tests for façades — Part 2: Large-scale test
Reaction-to-fire tests for façades — Part 2: Large-scale test
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 16
- Дата публикации:
- 6 декабря 2002 г.
- Издание:
- ISO IS 13785 edition 1 version 1
- ICS:
- 13.220.50
ISO 13785-2:2002 specifies a method of test for determining the reaction to fire of materials and construction of façade claddings when exposed to heat and flames from a simulated interior compartment fire with flames emerging through a window opening and impinging directly on the façade. The information generated from this test may also be applicable to the scenario of an external fire impinging on a façade; however, the results may not be applicable for all fire exposure conditions. This method is applicable only to façades and claddings that are non-loadbearing. No attempt is made to determine the structural strength of the façade or cladding. This test is not intended to determine the fire behaviour of a given building façade. Details such as balconies, windows, window shutters, curtains, etc., are not considered in this test. This test does not include the risk of fire spread e.g. through the window details of the façade system as it only is constructed as a façade wall. There is clear evidence that an internal corner (also called a re-entrant corner) configuration produces a more intense fire exposure than a flat façade. The most commonly encountered internal re-entrant corner is with an angle of 90°. The test façade specimen therefore contains an internal corner with a re-entrant angle of 90°. The test method described is intended to evaluate the inclusion of combustible components within façades and claddings of buildings which are otherwise of non-combustible construction.
Abstract
Overview
ISO 13785-2:2002 - Reaction-to-fire tests for façades - Part 2: Large-scale test defines a full-scale laboratory method to assess the reaction to fire of non‑loadbearing façade claddings when exposed to flames and hot gases venting through a window opening. The test simulates a post‑flashover compartment fire impinging directly on the external face of a façade and includes a 90° internal (re‑entrant) corner to represent a worst‑case exposure. ISO 13785-2 is intended to evaluate the contribution of façade components - including combustible elements - to upward fire spread, but it does not assess structural strength or detailed window/balcony/window‑system interactions.
Key topics and requirements
- Scope: Applies only to non‑loadbearing façades and claddings; not a full building fire assessment.
- Fire scenario: Simulated interior compartment fire with flames emerging through a window opening; may also represent some external fire impingement cases but not all exposure conditions.
- Specimen geometry: Includes main façade and a wing façade forming a 90° re‑entrant corner; designed to reflect the more severe exposure at internal corners.
- Test facility basics: Combustion chamber volume specified (20–100 m³); window opening nominally (2.0 ± 0.1) m wide × (1.2 ± 0.1) m high; façade height extends at least 4 m above the window opening; minimum façade widths given for main and wing walls.
- Measurements and criteria: Heat flux and surface temperatures (e.g., total heat flux 0.5 m above window), visual flame spread observation, instrumentation of thermocouples; calibration of facility required (after major changes or at least annually).
- Limitations & safety: Does not include balconies, shutters or detailed window assemblies; warns of toxic smoke/gas and potential specimen collapse; extinguishing means must be provided.
- Complementary documents: Normative references include ISO 13943 (fire vocabulary) and IEC 60584‑2 (thermocouple tolerances). Part 1 (ISO 13785‑1) provides an intermediate‑scale screening test.
Applications and users
ISO 13785-2 is used for:
- Fire testing laboratories performing large‑scale façade evaluations
- Façade system and cladding manufacturers assessing combustible components
- Fire safety and façade engineers specifying materials and detailing for high‑rise and insulated façades
- Regulators, building code authors and third‑party certifiers validating façade reaction‑to‑fire performance
- Insurers and risk assessors evaluating façade fire propagation potential
Practical outcomes include performance data on flame spread, heat flux response and contribution of façade assemblies to vertical fire growth (including potential leap‑frogging to upper levels).
Related standards
- ISO 13785-1: intermediate‑scale test for façade components
- ISO 13943:2000 - Fire safety - Vocabulary
- IEC 60584‑2 - Thermocouples - Part 2: Tolerances
- ISO 9705 - (referenced for interior surface product evaluation)
Технические детали
- Технический комитет
- ISO/TC 92/SC 1 - Fire initiation and growth
- SKU
- ISO 13785-2:2002
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