SIST EN 13116:2024/oprA1:2026

SIST EN 13116:2024/oprA1:2026 is the Slovenian draft amendment to EN 13116:2024 on curtain walling resistance to wind load. It specifies structural performance requirements for curtain walling under positive and negative static air pressure, including fixed and openable parts, and is aimed at people who design, test, specify, or verify curtain walling products defined in EN 13830.

What does SIST EN 13116:2024/oprA1:2026 specify?

SIST EN 13116:2024/oprA1:2026 is a draft amendment to the wind-load performance standard for curtain walling. It keeps the focus on structural performance under wind load and updates the serviceability requirement in clause 4.2.

The document is organized as a European foreword and one modification clause. The foreword identifies the responsible CEN committee and states that the draft amendment will modify EN 13116:2024 if approved.

What are the key requirements of SIST EN 13116:2024/oprA1:2026?

SIST EN 13116:2024/oprA1:2026 applies to any curtain walling product as defined in EN 13830. In practice, that means the scope follows the curtain walling product definition used across the European façade field.

The standard covers structural performance under wind load for both fixed and openable parts. For a project team, that means the whole curtain walling system has to be considered, not only the non-opening areas.

It addresses both positive and negative static air pressure. This matters because the façade must be checked for wind pushing inward and pulling outward, not just one loading direction.

Clause 4.2, “Performance under design wind load (serviceability limit state),” is the point changed by this amendment. The revised paragraph requires the displacement of framing members at points of support to be kept very small and to stay below the stated limit, measured as the difference between the position after removal of the peak positive load and the position after removal of the peak negative load.

The same clause also fixes how the measurement is taken. The positions are to be recorded no later than one hour after load removal, which matters for test planning and for comparing results between laboratories or product configurations.

Because the requirement sits in the serviceability limit state part of the standard, the concern is usable performance under load rather than ultimate failure. For manufacturers and specifiers, this means the acceptance check is about residual movement and service behavior after wind loading.

What terms does SIST EN 13116:2024/oprA1:2026 define?

Curtain walling is the façade product covered by this standard and is the product type defined in EN 13830.

Wind load is the action from wind that produces pressure on the curtain walling system.

Positive static air pressure is the pressure direction that pushes the façade inward.

Negative static air pressure is the pressure direction that pulls the façade outward.

Serviceability limit state is the performance condition used here to judge whether the curtain walling remains suitably usable under load.

Framing members are the structural members of the curtain walling frame whose movement is checked in clause 4.2.

Who uses SIST EN 13116:2024/oprA1:2026?

SIST EN 13116:2024/oprA1:2026 is used by curtain wall manufacturers, façade designers, testing laboratories, project engineers, quality managers, and purchasers who need a clear wind-load performance requirement. It is also relevant to specifiers and conformity assessment teams that must document how a curtain walling product behaves under design wind load.

What changed in SIST EN 13116:2024/oprA1:2026 from the previous edition?

Compared with EN 13116:2024, this draft amendment changes the third paragraph of clause 4.2. The update refines the serviceability requirement by defining how displacement at support points is judged after peak positive and negative loading and by keeping the post-load measurement window tied to one hour after load removal.

Which standards are used with SIST EN 13116:2024/oprA1:2026?

EN 13830 provides the product definition that sets the scope of this standard. EN 13116:2024 is the base standard that this amendment modifies, so readers need it alongside this document to apply the updated clause 4.2.

What does the SIST EN 13116:2024/oprA1:2026 document contain?

The document contains a European foreword and one modification instruction. The foreword identifies CEN/TC 33 and states that the draft is under CEN enquiry.

The body gives the replacement wording for the third paragraph of clause 4.2. In practice, it is a focused update to one wind-load serviceability requirement rather than a full rewrite of the standard.

It is used together with EN 13116:2024 when reviewing façade design, test reports, or product performance claims.