Sheerline’s ‘trailblazing’ Prestige aluminium bi-fold

Sheerline, the GGP Installer Award-winning range of aluminium window and door system, now includes a new range of bi-fold doors. The new Sheerline Prestige bi-fold combines style, security, innovation and sustainability in a ground-breaking range, its manufacturer claims.

Futureproofed against the proposed tightening of Part L of the UK building regulations, the bi-fold achieves extremely low U-Values – 1.4 W/m²K double glazed and 1.0 W/m²K tripled glazed. It features Sheerline’s multi-chambered Thermlock technology, which ensures greater thermal performance compared to other aluminium bi-folds that use polyamide thermal breaks.

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

Bespoke hardware, based on ‘tried and tested’ designs, is supplied by VBH, with a custom-made Winkhaus ‘Thunderbolt’ lock. Brisant-Secure’s Ultion 1* Plus 2* lock and handle combination is also available, offering three-star protection, as well as a unique folding Ultion key, that protects the frames from damage.

A one-piece stainless-steel track with integral drainage allows for controlled, reliable rolling, and tri-material Garnalex gaskets with low friction coatings ensure smooth operation. The ancillaries used on the bi-fold doors are the same as for the standard Sheerline Prestige window and door system, allowing for simplified stock holding. Fabricators also save time and money using the same milling cutter as the rest of the Sheerline Prestige range.

Clip in beads are used on the Prestige bi-fold, allowing for quicker, easier installation. The integral cill and ramped low threshold options also feature unique, one-piece end caps, which act as frame jointers, saving time, and incorporating concealed drainage. Outer frames can also be supplied to installers as a flat pack, to make onsite assembly easy.

Roger Hartshorn, Garnalex’s CEO, said: “Aluminium is the ideal material for bi-fold doors as it’s inherently strong and looks fantastic. Our technical experts injected innovation at every level, and, because we started from a clean slate, we avoided legacy design restrictions.

“We listened to our fabricator partners and then we designed a bi-fold to exceed their expectations and wow installers and homeowners. And, because we make every major part here in Britain, our carbon footprint is reduced and 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.”

Call Sheerline on 01332 883 960, email or visit On social media, follow @SheerlineSystem and @GarnalexSystems for the latest news and updates.

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