Lacuna
folding windows


Folding windows give a unique and exciting opportunity to open your home to light and life. The folding window is ideal when you want a big opening where it is not possible to enter or exit.

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CHOICE
OF MATERIALS

It is possible to choose from a number of wood species for your folding windows: 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® (Thermal Modified Timber) is the concept of Lacuna’s advanced heat-treatment, which we use on beech for the folding windows. No chemicals whatsoever, only heat, is used in the treatment. Through the TMT® process the timber obtain durability class 1, as teak, and a humidity of about 5.5%, making the modified timber very suitable for folding windows, as dimensional stability is extremely important for an airtight product that should not need adjustment during changing weather conditions (moisture / drought).

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

MAHOGANY
AND OAK

We can also supply European oak and FSC certified sapele mahogany, without TMT Composite® treatment, oiled in a number of color tints.

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 folding windows like in the automotive industry, priming our products twice with sanding inbetween 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.

PAINTED
SURFACES

In line with our principles, we only use environmentally friendly, water-based and proven durable paints. You can choose from a large number of RAL and NCS colors.

For items that are not particularly exposed, no paint treatment is required the first 25-35 years.

OILED
SURFACES

For our oil-treated mahogany or oak products, we use cold-pressed linseed oil that seals the wood surface much better than water or turpentine-based oils.
Please note that oil-treated products should be re-treated at least three times in the first year after installation. This will saturate the wood and prevent drying cracks. Subsequently, depending on how much the parts are exposed to the weather, they should be re-treated twice a year. We can now also offer a transparent UV surface treatment for our Sapelli mahogany and oak products. The UV surface treatment is similar to painting and the elements do not need to be treated for the first many years.


COLOUR
COMBINATIONS

Modern buildings often have dark frames externally. Here often a lighter, possibly white colour is chosen internally. We can paint our folding windows in two or three colour combinations – also if desired, for example, oiled mahogany combined with a white colour.

We can also paint several types of texture as well as a colourless paint – like varnish.

Some options are:
1. Combination of RAL 9005/9010
2. Combination of RAL 7016/9010
3. Mahogany, combined with 9010 and linseed oil
4. Mahogany, oiled with cold-pressed linseed oil
5. Mahogany, with cold-pressed black pigmented linseed oil
6. Oak, oiled with cold-pressed black pigmented linseed oil
7. Oak, oiled with cold-pressed linseed oil 

MILLIMETRE-PRECISION

All the work is done on CNC robots with a precision of a tenth of a millimetre.

Our quality control and CNC robots eliminate the risk of human error and too large tolerances.

OUTWARDS OR INWARD-OPENING
FOLDING WINDOWS

It is possible to choose if your window should open into or out of your home.

NUMBER OF LEAVES AND
LOCATION OF THE MASTER LEAF

There are numerous options and combinations when it comes to the number of leaves and the location of the master leaf. In order to be able to fold the door, an odd number of door leaves are required. This means that on a door with an odd number of leaves, all leaves fold to the same side. If the door has an even number of leaves, these will be divided so that an odd number of leaves open to each side.

A few opening options are shown below, with varying number of leaves.

GLASS

The glass is a major part of a folding window. It is therefore important that the choice of glass is correct. Besides two or three-layer glass, folding windows can be supplied with glass that meets different requirements and functions. We only use quality glass from the leading glass manufacturers for the construction industry. We offer a wide selection and will readily advise you.

Please note that the more energy-efficient glass you choose the greater care you take of the environment. It is worthwhile investing in energy-efficient glass as the door and glass are built to last for many years.

CHOICE
OF GLASS

Most of our windows are supplied to facades where low-energy glass in either two or three layers is selected. However, our doors can be supplied with many other types of glass:

• Low energy
• Noise reduction
• Safety (Toughened and/or laminated glass)
• Solar control
• Self-cleaning
• Translucent glass types
• Glass with integrated blinds etc.

INTERNAL
GLASS BEADS

Unlike most other Scandinavian manufacturers of doors and windows, the glass in a Lacuna folding window is fitted from the inside. The glass beads are thus well protected inside, giving a number advantages: less maintenance, as there are no external joints, and greater security against burglary, as the glass beads cannot be removed by intruders.

DESIGN DETAILS

Lacuna offers flexibility in its design. This means that you can freely choose whether you want your folding windows without glazing bars, with helima integral bars, standard glazing bars, panels or perhaps with breaking transoms.

GLAZING BARS

You have the option of choosing many different widths of the bars: 19 mm, 25 mm, 36 mm and 42 mm, with different types of profiles. In addition, you can get transoms (horizontal post) in 55 mm, 75 mm and 110 mm.

LARGE NON-BROKEN
SURFACES

The majority of our customers choose a folding window without glazing bars or fillings.
The wide window leaves, in a very thin frame, give a stylish and simple impression.

Lacuna helårshus foldedør billeder

FOLDING WINDOW
GLAZING BARS

Lacuna manufactures several different types of glazing bars and transoms. Most of the customers who want glazing bars in their outward-opening folding door choose 25 mm moulded bars with what we also call farmhouse profile on the inside. This design is also available in widths of 19mm, 36mm and 42mm. For all widths, an internal softline profile is also available, which gives a simple and modern impression that matches the style of new buildings. All of our glazing bars are externally tenoned in the frame (not glued to the glass) and cannot fall off.

Lacuna helårshus foldedør billeder

HELIMA
GLAZING BARS

As an alternative to the traditional glazing bars, we also offer Helima bars. There are bars built in between the glass panes. Thus, there are no bars on the outside or inside of the door. Helima is price-attractive and has a great advantage when it comes to cleaning. The bars are available in several widths: 18mm, 26mm and 45mm.


TRANSOMS/
HORIZONTAL POSTS

If you want wider posts, we also make 55 mm, 75 mm and 110 mm horizontal transoms. These are continuous and thus divide the glass in the door. The transoms are, of course, completely integrated into the design of the frame.


HINGES &
HANDLES

The Lacuna products can be exposed to powerful corrosive forces in e.g. Greenland and other coastal areas, with sometimes up to 7% salt content in the water.

At Lacuna we do not distinguish between where the elements are to be installed. All Lacuna products are manufactured in the same high quality.

CORROSION-RESISTANT
MATERIALS

We want the door including ironmongery to stay beautiful without corrotion for its entire life. We know that there are many different conditions that affect ironmongery. Particularly coastal areas can be a challenge for the stainless steel, so all parts are therefore treated with protective oil. Lacuna recommends regular maintenance and washing to keep the ironmongery and door clean. All hinges and handles are made of stainless steel and are available in black, white or steel.

Please read our maintenance guide.

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