Lacuna Inward-Opening Passivhaus Standard Bifolding Doors

An inward-opening folding door is ideal if you have e.g. a small balcony. With an inward-opening folding door you get a large opening on to your balcony without the door taking up space on the balcony as it opens into the room. In this way you get the most out of your outdoor area. We always manufacture the folding door to meet your needs and wishes. We can change e.g. the width, height, handle and glass types, as well as the top frame.

CHOICE OF MATERIALS

It is possible to choose from a number of wood species for your inward-opening folding door: oak, beech and mahogany. At Lacuna, we use environmentally friendly processes in our treatment of the wood, which make it as maintenance free as wood / alu. Please read about our TMT Composite® treatment below.

TMT Composite®

TMT Composite® (Thermally Modified Timber) is the concept of Lacuna’s advanced heat-treatment, which we use on beech for the folding doors. No chemicals whatsoever, only heat, is used in the treatment. Through the TMT® process the timber obtains durability class 1, as teak, and a humidity of about 5.5%, making the modified timber very suitable for folding doors, as dimensional stability is extremely important for an airtight product that should not need adjustment during changing weather conditions (moisture / draught).

The TMT Composite® also provides much better insulation, as the wood cannot absorb moisture like untreated wood. The result is a folding door that lasts for many, many years.

SURFACE TREATMENT OPTIONS

It is possible to chose among a number of surface treatments – either painted or oiled. More than 90% of what we manufacture is painted TMT beech. We can paint in all colors, and also in transparent paint with UV filter on e.g. TMT Composite®.
We at Lacuna paint our inward-opening folding doors like in the automotive industry, priming our products twice with sanding in-between and applying two or three layers of top coat, depending on colour. The result is a super smooth surface (many believe it is painted aluminium) that is much more durable than through the traditional technique used in the window industry.

SUPERIOR AIRTIGHTNESS AND INSULATION 

The Lacuna folding doors are certified, tight and well insulating. Our passive house standard, patented system is designed with emphasis on great insulation properties and tightness through double seals in the outer frame and triple seals between the door leaves. Lacuna folding doors are built to work from -60 degrees and up to +50 degrees celcius. Therefore, customers far above the polar circle as well as on the Equator are happy with our products. Good insulation and tightness work both ways!