Technical News

Our technical news section describes the conclusions of technical issues that have been discussed within the CWCT Technical Committee. Note: The conclusions reached were made based on the best available knowledge at the time. We welcome your comments and feedback on these issues. If you would like to get in touch, please email us.

When British Standards are Updated: Which Edition Applies?

Sep 04, 2026

Guidance on when updated standards apply.

BS EN 1991-1-4:2026 has been published

Sep 04, 2026

Details of the updated standard.

Thermal performance of louvres glazed into fenestration and curtain walls

Aug 06, 2026

Your feedback is requested.

Qualicoat 3.0 Specification

Jun 24, 2025

Guidance on the new Qualicoat 3.0 specification.

The use of magnesium oxide (MgO) boards

Jul 15, 2019

In high humidity conditions MgO boards can suffer from sweating/leaching releasing chloride which can cause corrosion of metal components, particularly fixings, in contact with the board. There have also been reports of timber in contact with the board being adversely affected.

Clarification of TU21 requirement for dynamic watertightness testing

Jul 10, 2019

TU21 states that a dynamic watertightness test is required when the wind load exceeds 1800Pa. A query has been raised whether this is the positive wind load or the greater of the negative and positive pressures.

Pretreatments for powder coating on architectural aluminium

Dec 18, 2018

This note summarises the current changes affecting the specification of powder coatings on architectural aluminium and provides interim information for specifiers.

Fire

Jul 25, 2017

Following the tragic events at Grenfell Tower last month, focus is now turning to how the industry responds to the challenges ahead. This includes short term concerns such as ensuring that current buildings are safe, and longer term issues such as revisions to the Building Regulations.

Revised method of heat soaking toughened glass

Sep 26, 2016

A revision of BS EN 14179 Glass in building - Heat soaked thermally toughened soda lime silicate safety glass Part 1 Definition and description was issued in August 2016. The most significant change is to the temperature regime for the heat soaking process.

Revised European curtain wall product standard BS EN 13830:2015

Apr 25, 2016

Although this Standard has been published by BSI, it has not been approved by all the relevant European committees and therefore is not currently valid for CE marking.

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