Style, security and sustainability

Sheerline has launched a new range of bifold doors, which “combines style, security, innovation and sustainability”, the company said.

Future proofed against the proposed tightening of Part L of the Building Regulations, the bifold achieves U-values of 1.4W/m²K double glazed, and 1.0W/m²K tripled glazed. It features Sheerline’s multi-chambered Thermlock technology, which ensures greater thermal performance compared to other aluminium bifolds that use polyamide thermal breaks, the company said.

With four different threshold options, including one with an integrated sill, 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.

Bespoke hardware is supplied by VBH, with a custom-made Winkhaus Thunderbolt lock. Brisant Secure’s Ultion 1-Star Plus 2-Star lock and handle combination is also available, offering 3-Star protection, as well as a folding Ultion key that protects 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 bifold 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, the company said.

Clip-in beads are used on the Prestige bifold allowing for quicker, easier installation. The integral sill and ramped low threshold options also feature 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.

Roger Hartshorn, Garnalex CEO, said: “Aluminium is the ideal material for bifold 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 bifold 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 bifold 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.”