AluK has launched an updated version of its BSC94 inline sliding door, targeting sales opportunities for fabricators in replacement and newbuild markets while retaining the appearance of its established system.
The BSC94 HI combines a larger thermal break with changes to fabrication and stockholding requirements. AluK describes the new door as Part L compliant, with a tested and validated U-value of 1.4 W/m²K and a Door Set Energy Rating of C when fitted with double glazing.
Available in standard and slim versions, the system offers interlock sightlines of 85mm or 45mm. Both incorporate a 42mm thermal break.
For existing AluK customers, the commercial proposition extends beyond thermal performance. A redesigned, symmetrical outerframe reduces the amount of stock fabricators need to hold, while existing press tools can remain in use following a small adaptation.
The outerframe requires mechanical jointing only. Fabricators retain a choice of crimping or mechanical jointing for the sash.
Paul Booth, AluK’s technical director, said the launch reflected renewed interest in sliding doors as buyers seek a greater proportion of glass to frame.
“With sliders undergoing a resurgence in popularity as more and more buyers opt for the expansive glass to frame ratio, our fabricators need a high performing, easy to fabricate solution which ticks all the boxes in terms of compliance and aesthetics,” he said.
Booth described the BSC94 as one of AluK’s most popular mainstream products. He said the upgraded door’s U-value made it suitable for refurbishment projects and placed it within the 1.6 W/m²K limiting value cited for new buildings.
The system also incorporates an anti-bimetal low lambda strip, which AluK says accommodates differing expansion rates to maintain smooth operation and locking during hot weather. It accepts double-glazed units between 20mm and 31mm thick.
Double and triple track configurations are available, with panels measuring up to 3,000mm high and 2,000mm wide and weighing a maximum of 400kg.
Customers can choose single or dual colours from AluK’s range, alongside matt, metallic and anodised finishes. The launch brings thermal performance, fabrication changes and the original system’s aesthetic appeal together in an updated offering for both target markets.
Why This Matters: AluK’s upgrade addresses two commercial priorities for UK fabricators: thermal performance and production costs. Reduced stockholding and continued use of existing tooling could make the transition more manageable, while slimmer sightlines give installers a stronger sales proposition. For retailers, the combination of larger glazed areas and improved insulation offers a persuasive homeowner message. Its significance lies in updating an established product while limiting the operational changes required from existing customers.
