|  Tel: 020 3475 8049

Member Login


Often being chosen for their architectural accuracy, elegance or physical strength, steel framed windows continue to be able to satisfy the full requirements of the Building Regulations, thanks to the detailed development work carried out by the industry’s trade body, the Steel Window Association.

As a result of the SWA’s latest phase of physical advancements to the W30 systems’ thermal insulation performance, and independent testing of specimen windows, it has now achieved the BFRC ‘B’ rating standard and is able to satisfy the requirements of the revised Part L covering new build properties.

Much of the development work has been carried out by long term SWA member, NSB Casements in consultation with the association’s technical committee. Testing has been conducted at the BFRC’s own facility.

NSB Casement’s David Northam explains: “The Steel Window Association has always been active in helping its members keep pace with technological change and to meet all requirements necessary in the new build as well as refurbishment markets, which is why this important programme of development work has been undertaken.

“We have uprated the weather seals from EPDM to PVC and the beads from aluminium to stainless steel because of their lower thermal conductivity. Then for the IG units we have used warm edge spacer bar along with a higher specification of glass and Krypton gas filling; enabling us to achieve the ‘B’ Rating required under the most recent revision to Part L of the Building Regulations. It is a very important landmark for the development of the W30 suite of sections, and steel windows as a fenestration solution preferred by wide sections of the construction industry.”

Since its original introduction some years ago, the W30 system has been specified for domestic, commercial and other industry sectors, offering customers outstanding strength, security and durability as well as the slender sight-lines for which steel windows are renowned. Simultaneously the thermal enhancements to all areas of the windows’ thermal characteristics has enabled members of the Steel Window Association to offer their clients various configurations of window which still achieve excellent resistance to wind and water penetration as well as energy loss. W20 and W40 sections continue to be available with the latter being able to accept triple glazing, and often being preferred for the fabrication of doors.