Superior Insulation Performance

Lacuna folding doors are certified, airtight, and highly insulating. Our patented system is designed with a focus on exceptional insulation and tightness, achieved through double sealing in the frame and triple sealing between the door panels.

Lacuna folding doors are built to perform in temperatures ranging from –60°C to +50°C. That’s why our products are used and appreciated both far above the Arctic Circle and deep in Africa. Excellent insulation and tightness work both ways!

FOLDING DOOR WITH GREAT VALUE FOR MONEY

Insulation and airtightness are crucial to the overall value of a folding door. That is why it has always been fundamental for Lacuna to create a product that remains completely airtight—even in hurricanes far more severe than those we normally experience in Denmark.

Long after the Great Belt Bridge has been closed and Hurricane Katrina has devastated New Orleans, a Lacuna folding door still remains airtight.

NOMINATED FOR ENERGY AWARD

This makes a Lacuna folding door the most cost-effective solution in the long run. There is a reason why Lacuna, with its products, has been nominated several times for the Danish Construction Association’s Energy Award. We continuously develop our products—Lacuna takes pride in staying ahead of the curve in terms of functionality, finish, burglary protection, durability, and energy efficiency.

When it comes to product development, we think German—and when it comes to design, we think Danish. We proudly sell to many countries around the world.

WOOD WITH SUPERIOR INSULATION

When it comes to insulation performance, a Lacuna product is among the very best. Insulation is measured by the Uw value, which indicates thermal performance—the lower the Uw value, the better the insulation.

A standard window with double-glazed low-energy glass typically has a Uw value of around 1.2–1.5. A Lacuna product, with comparable glazing, achieves a Uw value of 1.05, and with standard triple glazing, it can reach as low as 0.8. The numbers speak for themselves—this corresponds to a home requiring only 40% of the energy for heating compared to a standard window or folding door.

TMT COMPOSITE® HEAT-TREATED WOOD

For painted products, we use FSC-certified, laminated, heat-treated beech wood from Germany. Heat-treated beech has the same durability as teak—durability class 1—which is wood that lasts almost indefinitely and does not rot.

In addition, it offers insulation performance far superior to that of untreated wood species, and, importantly, it does not absorb water in wet and humid conditions, giving the wood outstanding dimensional stability.

WOOD-ALU
...NOT FOR A FOLDING DOOR

For this reason, Lacuna products are not manufactured in wood-aluminium, which may be a suitable solution for a single or two door panels within one frame. The challenges with other wood types arise when there are three or more panels in a single frame.

Lacuna folding doors are exposed to highly varied climatic conditions. In places like Bergen in Norway or the Faroe Islands, it can rain 250 days or more each year, while in other regions it rarely rains at all. Therefore, the dimensional stability of the wood is crucial to ensuring effective insulation performance.

A LACUNA DOOR AFTER 4 MONTHS IN SALTWATER

A high-quality folding door that is expected to remain airtight for 50 years depends on the dimensional stability of the door panels. In this video, we showcase one of the many tests our products undergo to meet both your expectations and ours.

The frame is made from TMT Composite®, which is heat-treated beech. After 4 months in saltwater, the frame has expanded by only 0.4 mm—meaning the paint remains crack-free and the dimensional stability is exceptionally high.

When quality needs to be felt

Read why customers choose Lacuna for their homes and building projects.

“Lacuna doors are top quality. Quite simply, Lacuna was recommended by Paw, our architectural advisor from We Make Space, and after looking at various folding doors, there was no doubt. Lacuna was by far the most beautiful and the best quality. We bought and had a three-panel door installed by Hardy from Dansk Vinduesservice ApS. Professional and excellent advice, and the installation was spot on. We felt in safe hands all the way through. We’re looking forward to a summer with our folding door wide open.”

Lars Blomstrøm

“We have just had a Lacuna folding door with four sections and a double door delivered. The guidance we received before ordering was excellent. Once the doors were ready, we were able to have them delivered on the day that suited us, and since we were not quite ready for installation, they stored the doors for us until we needed them. The doors arrived as planned, and the carpenter was very impressed by how clear the assembly instructions were, as well as by the quality of the materials. They are very beautiful and sturdy doors. They glide extremely well, and the service has been absolutely top-notch. I can only recommend spending a little extra money to get doors of the very best quality — doors that we know will last.”

Louise Pedersen

“Lacuna has delivered the most beautiful folding doors for our new bedroom. Our expectations were sky-high and were truly exceeded – we received the best service from start to finish, and every single day we’re so happy that we can open up and bring nature inside. Thank you, Henrik and the entire Lacuna team!”

Lone

“From the very first phone call until now, we have received the very best service. We were given really great advice on which door to choose in order to get the most out of the room it was going to be installed in. We also chose to use the company Lacuna works with for measuring, and we are so pleased that we did. They have also been a great help with everything we needed. We can therefore only recommend buying from them again. Thank you so much for all your help. We look forward to replacing the other doors in the house as well, and we know that you will be there ready to help.”

Katja Schibsbye

HAVE A LOOK AT OUR SHOWROOM

We know that visiting Denmark isn’t possible for everyone, so we’ve created a short video to give you a quick visual tour of our showroom and show Lacuna’s folding doors in action. It’s an easy way to experience the product and feel more confident in making the right decision.