Heat Treated Timber – TMT COMPOSITE®
TMT Composite® (Thermally Modified Timber) is the concept of Lacuna’s advanced heat-treatment, which Lacuna uses on FSC-certified, laminated German beech for painted bi-folding doors. No chemicals whatsoever, only heat, is used in the treatment. Through the TMT® process the timber obtains durability class 1, like 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 due to changing weather conditions (moisture / draught).
At the same time TMT Composite® has a much better insulation as the treated wood does not absorb humidity as untreated wood would, resulting in bi-folding door that will last for many years. A sustainable process for sustainable construction.
EUROPEAN OAK AND FSC-CERTIFIED SAPELE MAHOGANY
European oak and FSC-certified sapele mahagony are alternatives, either oiled or painted with transparent coating. Pine and other soft woods are not used due to their lack of dimensional stability.
This is a reddish brown hardwood from Mahogany family imported from West Africa. Sapele is very hard, dense, stable and has beautiful natural grain, which is enhanced by applying a finish .
BI-FOLD DOOR OPENING OPTIONS
Lacuna outward-opening bi-folding doors are manufactured to individual measures from 1.5 m to 6 m width and max. 2.8 m height. The individual door leaves can be up to 100 cm wide (double glazed) and 90 cm ( triple glazed).
Lacuna bi-folding doors can be supplied in combinations with 3-9 leaves and with numerous options for the 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.
For MORE OPENING OPTIONS click image below:
It is possible to choose among a number of surface treatments – either painted or oiled.
More than 90% of Lacuna’s products are painted TMT beech. Doors can painted in all colors, and also in transparent paint with UV filter on e.g. TMT Composite® pine. Outward-opening bi-folding doors are painted with the same technique as 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.
In line with our principles, only environmentally friendly, water-based and proven durable paints are used. 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. The paint on thermally modified timber lasts longer without maintenance than on timber-alu products, as the TMT Composite adopts the characteristics of a composite or fibre-glass and do not extend nor retract when exposed to moisture or temperature.
For our oil-treated mahogany or oak products, cold-pressed linseed oil that seals the wood surface much better than water or turpentine-based oils is used.
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. A transparent UV surface treatment for our Sapelli mahogany and oak products are also offered. The UV surface treatment is similar to painting and the elements do not need to be treated for the first many years.
Modern buildings often have dark frames externally. Here often a lighter, possibly white colour is chosen internally. We can paint bi- folding doors in two or three colour combinations – also if desired, for example, oiled mahogany combined with a white colour.
Some options are:
We can also paint several types of texture as well as a colourless paint – like varnish.
The glass is a major part of a folding door. It is therefore important that the choice of glass is correct. Besides double or triple glazing, Lacuna doors can be supplied with glass that meets different requirements and functions.
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.
is specially treated with a microscopically thin, virtually invisible transparent coating on one surface. The coating reflects heat back into the building, thereby reducing the heat loss through the window.
This glass is used as a standard in all our windows and doors.
is a type of safety glass that holds together when shattered.It provides even greater security levels that toughened glass, offers better levels of sound reduction and thermal insulation.
is up to five times stronger than ordinary glass of the same thickness.Toughened glass is used where strength, thermal resistance, and safety are important.
SOLAR CONTROL GLASS
is a glass with a special coating designed to reduce the amount of heat entering a building. It reflects and absorbs heat as well as filtering light for reduced glare. Using a solar control glass can reduce the need for air-conditioning and blinds.
considerably reduces external noises, especially near busy areas such as motorways, main roads , railways and airports.
Bilfold doors can be also be supplied with other types of glass , for example, self-cleaning glass, glass with integrated blinds etc.
The majority of customers choose doors without glazing bars or fillings. The wide door leaves in a very thin frame create sleek, contemporary look.
However, if you prefer to have glazing bars, they come in many different widths: 19 mm, 25 mm, 36 mm and 42 mm, with different types of profiles. In addition, you can get transom (horizontal post) in 55 mm, 75 mm and 110 mm.
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 glazing bars are externally tenoned in the frame (not glued to the glass) and cannot fall off.
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.
Lacuna also supplies panels that are flat or raised. The panels are not solid but laminated with a high-insulating material for the best possible insulation. Panels are supplied in the same colour as the door
All hardware is made from Danish marine-grade materials to prevent rusting in even harsh seafront locations.
All hinges are stainless steel and are available in black, white or steel.
TOP FRAME SYSTEM
Lacuna folding doors also feature a revolutionary, patented top frame system with a guiding rail integrated into the top frame. This system provides ease of use, simple and cost efficient installation and an elegant finish.
The system is available in different versions, taking account of the load on the top frame. The system simplifies installation considerably. Lacuna doors can be installed in half the time of traditional installations, which increases their cost efficiency. When installed in existing houses, the patented top frame system often eliminates the need to add expensive iron or laminated wooden girders. Top frames are available with built-in carbon fibre reinforcement, which render the frame either fully or partly self-bearing.
All ironmongery follows a strict principle of 18mm diameter and is manufactured in acid-proof stainless steel that guarantees a durable and timeless design.
Information coming soon
Information coming soon
After almost 15 years in the market, Lacuna is known for its unique design and exceptional quality. Lacuna doors are made to last for 50 years or more.
Not only does the heat treatment of timber increase the natural durability (and becomes equal to teak -Class 1), it also makes the timber very stable, and accordingly it is unable to absorb moisture and expand in humid weather. This is obviously an essential attribute for folding doors, where many panels in succession need to keep their dimensional stability in order to function properly all year around. It furthermore means that the paintwork does not crack and maintenance therefore is at a minimum.
extreme durability test
Beyond complying with international standard tests, Lacuna also performs its own extreme tests on moisture absorption, dimensional stability and insulation of the folding doors.
Lacuna pulled their TMT composite (heat treated beech) door frame out of salt water after being fully submerged for four months. After this full submersion, the paint had not cracked and it had only expanded by 0.4mm. This demonstrates the unique durability of Lacuna’s products.
Information coming soon