Bi-Folds Open Up Sheerline Range

Sheerline’s new Prestige aluminium bi-fold.

Sheerline has launched a new range of bi-fold doors, which extends its range of Sheerline Prestige aluminium windows and doors.

The company is claiming that its Sheerline Prestige bi-fold combines style, security, innovation and sustainability and pushes performance boundaries with Sheerlines Thermlock technology giving U values of 1.4 W/m²K double glazed and 1.0 W/m²K tripled glazed. Thermlock employs closed cell multi-chambered cores to give greater thermal performance compared to polyamide thermal breaks.

With four different threshold options, including one with an integrated sill and all featuring fully weather-sealed rebates, it offers up to seven pane configurations. With both inward and outward opening options, the bifold has a maximum height of 2.6m and a maximum width of 6.5m.

Hardware based on tried and tested designs is supplied by VBH, with a custom-made Winkhaus Thunderbolt lock. It includes one-piece keeps and an integral finger-pull passive door for configurations that feature French door style sashes. The new bi-fold also comes with the option of an Ultion 1* Plus 2* lock and handle combination and a folding Ultion key, that protects the frames from damage. There are 10-year mechanical operation guarantees on all hardware.

According to Garnales the one-piece stainless-steel track with integral drainage allows for controlled, reliable rolling, as well as being easier to fit and cut. Tri-material Garnalex gaskets feature low friction coatings ensuring smooth operation.

The ancillaries used on the bi-fold doors are the same as those used on standard Sheerline Prestige window and door systems. The company says that its standard patented corner cleat construction enables fabricators to adjust the mitre as required.


 “Aluminium is the ideal material for bi-fold doors as it’s inherently strong and looks fantastic. The bi-fold door suites with the Sheerline Prestige range so the same clean balanced sightlines run right through from windows and doors to the bi-fold. Homeowners love that.”

– Roger Hartshorn 

CEO, Garnalex

Energy & environment

“We listened to our fabricator partners and then we designed a bi-fold to exceed their expectations and wow installers and homeowners," continues Garnalex' Hartshorn. "And because we make every major part here in Britain, our carbon footprint is reduced compared with aluminium systems that are imported from the other side of the world. Again, because we supply our standard range of colours from stock and bespoke colours are made on site, the Prestige bi-fold is available in our standard range of 12 stocked colours within five working days, with bespoke colours in just 10 working days. That’s also pretty remarkable for aluminium.”

Picture: Sheerline’s new Prestige aluminium bi-fold.

Article written by Cathryn Ellis
29th September 2021


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