EN 13116:2024/prA1

EN 13116:2024/prA1 is a CEN draft amendment to EN 13116:2024 on curtain walling resistance to wind load. It updates the performance requirement for curtain walling under positive and negative static air pressure, for curtain walling products as defined in EN 13830. In practice, it is relevant to people who need a clear acceptance criterion for wind-load behaviour in façade design, testing, and specification.

What does EN 13116:2024/prA1 specify?

EN 13116:2024/prA1 specifies one change to the structural performance requirement for curtain walling under wind load. It focuses on serviceability performance at the design wind load stage, and it applies to both fixed and openable parts of the system.

The document is organized as a European foreword and one amendment clause. Clause 1 gives the replacement text for Clause 4.2 in EN 13116:2024, so the amendment is narrowly targeted at one performance requirement rather than rewriting the whole standard.

What are the key requirements of EN 13116:2024/prA1?

EN 13116:2024/prA1 changes the serviceability limit state criterion in Clause 4.2. The key practical point is that movement of framing members at support points must be kept very small after wind loading, so the façade remains acceptable in use.

The revised displacement criterion

Clause 1 replaces the third paragraph of 4.2 with a requirement that the displacement of framing members at points of support be minimized and kept below 2 mm. The displacement is assessed as the difference between the position after removal of the peak positive load and the position after removal of the peak negative load.

For users of the standard, this means the check is not just about how much the curtain walling deflects under load, but also about how much residual movement remains after the load is removed. That matters for appearance, operability, sealing, and the long-term fit of the curtain walling.

The timing of the measurement

The amendment also sets a time limit for the measurement: the displacement is measured no later than one hour after the load is removed. This matters because the result is tied to a defined recovery period, so test results and reported values are comparable between laboratories and projects.

Positive and negative wind loading

The requirement is based on both peak positive load and peak negative load. In practice, the curtain walling must be assessed for pressure and suction effects, since both directions of wind action can control the serviceability result.

Fixed and openable parts

The scope covers both fixed and openable parts of curtain walling. That means the criterion is relevant not only to static façade panels, but also to components that can move or open and that still need to perform within the same wind-load framework.

What terms does EN 13116:2024/prA1 define?

• Curtain walling - the façade product family covered by EN 13830, used as the basis for this wind-load performance requirement.
• Serviceability limit state - the condition where the curtain walling must remain fit for use, with deformation kept within acceptable limits.
• Design wind load - the wind load level used to assess serviceability performance.
• Peak positive load - the highest pressure load acting on the curtain walling in the positive direction.
• Peak negative load - the highest suction load acting on the curtain walling in the negative direction.
• Framing members - the structural members of the curtain walling frame whose movement at support points is checked.
• Displacement - the change in position of the framing members after the wind load has been removed.

Who uses EN 13116:2024/prA1?

Curtain walling manufacturers use this amendment when setting product performance criteria and preparing evidence for wind-load behaviour. Façade engineers and specifiers use it when defining acceptance limits for projects.

Test laboratories use it when measuring post-load movement and reporting results. Quality managers and buyers use it to compare supplier documentation, check conformance claims, and make sure the wind-load criterion matches the product they are purchasing or approving.

What changed in EN 13116:2024/prA1 from the previous edition?

EN 13116:2024/prA1 modifies EN 13116:2024 by replacing the third paragraph of Clause 4.2, “Performance under design wind load (serviceability limit state)”. The new text introduces a clearer displacement limit at support points and ties the measurement to the positions after removal of the peak positive and peak negative loads.

Which standards are used with EN 13116:2024/prA1?

EN 13830 is named in the scope and defines the curtain walling product family to which this document applies. EN 13116:2024 is the base standard that this amendment modifies, so the two are used together.

What does the EN 13116:2024/prA1 document contain?

The document contains a European foreword and one amendment clause. The foreword identifies it as a draft amendment prepared by CEN/TC 33 and submitted for enquiry.

Clause 1 gives the replacement text for Clause 4.2 of EN 13116:2024. The content is focused on one serviceability requirement, so it is a short amendment intended for direct use in design checks, testing, and conformity assessment of curtain walling under wind load.