Are mineral-wool wall panels non-combustible? Understanding A1, A2 and EI

A panel contains a core, facings and the connections between them, as well as coatings and other components. The classification of the wool alone cannot simply be assigned to the complete product. Look for the name of the finished panel in its documentation, not just the insulating material.

A2-s1,d0 is an example of a finished mineral-wool panel’s reaction-to-fire classification. It does not describe every panel with this core. The result belongs to the assessed product. For older, used or unidentified stock, establish its construction and properties first. The appearance of a cut edge does not prove its classification.

The s1 part concerns limited smoke production within the test criteria. The d0 designation concerns the absence of flaming droplets or particles under the classification conditions. Neither promises that no smoke will occur in every real fire, nor that toxic gases cannot be produced.

Do not reduce these symbols to “completely safe in a fire”. They allow comparison of specific product behaviour. Building safety also depends on the structure, escape arrangements, services and use. A favourable material property cannot describe all these factors.

E stands for integrity and I for insulation in a fire-resistance assessment. The number denotes a period under the relevant classification. It is not a promise that an arbitrarily assembled wall will withstand every real fire for exactly that many minutes. Test conditions and the field of application matter.

The classification covers a particular panel type and assembly. Orientation, span and connections are among the relevant factors. Read the footnotes instead of taking only the highest number from a table. Conditions may differ between arrangements using the same panel, so a general product-family label is insufficient for wall design.

A wall includes its connections to the floor, structure and roof. It may also contain doors and service penetrations. Each junction needs a detail consistent with the design. The panel does not transfer its classification to any arbitrary mounting foam or sealant used beside it.

Retain the specified arrangement and accessories during installation. Do not alter supports or installation direction without checking the consequences. Later openings for services also need assessment. A previously completed wall does not automatically retain all its properties after every alteration; the documentation should reflect its actual condition.

A public product sheet and an installation manual may be updated at different times. A discrepancy does not justify selecting whichever statement looks more favourable. Obtain the manufacturer’s confirmation of the current classification and scope for your assembly, and retain it with the project records.

Different tables may refer to a different panel variant, support arrangement or classification scope. Do not fill gaps by assumption. Confirm which document applies to the proposed solution and keep it with the design and order. Weight or thermal-performance figures do not settle fire-performance requirements.

Specify the product and required reaction-to-fire classification. If the wall needs a particular fire resistance, include the design assumptions: orientation, span and supports. Request documentation that relates to that complete arrangement.

At delivery, verify panel identification and keep the batch documents and instructions. Do not accept substitution solely because another product “also has wool”. Similar core material and thickness do not establish equivalence. Clear records show what was installed and the basis on which the wall was assessed.

Keep panel documentation distinct from that of doors or sealing compounds. Each component may have its own classification, yet combining them arbitrarily does not create a classified wall. The complete assembly must be compatible. At acceptance, check both that documents are present and that they describe the components actually installed.

No. These are different classifications: A2-s1,d0 concerns reaction to fire, while EI concerns the fire resistance of a specified building element.

No. It refers to test criteria, not a promise of no smoke or toxic products in any possible fire.