Learn more about our products and processes by browsing these frequently asked questions. If you don’t see the answer to your question here, one of our consultants would be happy to help.

General Q&A

Can you tan through glass walls?
The tempered glass allows some of the sun’s UV rays to pass through, so it is quite possible to sunbathe with the glasses closed! See the UV protection
How much does the glazing protect against UV rays?
The UV transmission of our tempered glass depends on the thickness and colour of the glass:
Clear glass
6 mm = 57%
8 mm = 52%
10 mm = 49%
12 mm = 46%
Gray glass
6 mm = 18%
8mm = 12%
Can patterns, lines or marks appear on the surface of the glasses?
Some glass manufacturing processes, such as tempering, can create patterns on the glass that become visible if the glass fogs up. Fogging is a normal and natural phenomenon. The same phenomenon can occur in car windows. Traces or patterns can be seen from 2 meters away under normal lighting conditions.
How can I get rid of fog that forms on the glass panes?
A glazing consists of single panes of glass, which tend to fog more when warm, moist air hits the cold glass pane directly. If the glass is very cold and you open the door from the apartment, the glass fogs up on the inside. A facade is never completely sealed, and especially in older houses, both moisture and heat leak out, which is captured by the glazing. It is for this reason that a glazing should never be completely sealed, but a ventilated space so that the facade is not damaged by moisture. If you have glazing from us, you don’t have to worry about it being too tight because our glazing is always installed with regard to the facade and in accordance with the best practices However, our glazing also fogs up when it’s cold outside and warm, moist air hits the glass. The phenomenon of fogging on the inside of the glass is also common in, for example, cars. In exactly the same way that you start the fan in the car and turn on the heat to remove the fog on the glass, you can add a heat source or heating fan on the balcony or patio if you want to avoid fogging up on your glazing.
Can any silicone spray be used to lubricate wheel bases, plastic parts and profiles?
Normal silicone sprays and oils can be used for lubrication. We recommend first cleaning the profiles and parts and lubricating the system once or twice a year so that the glasses move smoothly. The spray should be sprayed sparingly. Do not use other lubricants or greases such as petroleum jelly or oils. They often attract dirt, which can damage the wheels of the system. If for some reason the glasses do not move smoothly, contact our service department
What kind of guarantee does Lumon glazing systems have?
Can I get spare parts for the glazing?
Lumon is committed to ensuring the usability of its products in the coming years. We guarantee full availability of spare parts for all Lumon glazing, Lumon and Visor blinds for 10 years from the original date of purchase. In addition, the functional and safety-related components of Lumon glazing systems are available in one colour for 20 years. For other products purchased from Lumon, we guarantee full availability of spare parts during the warranty period. for more information check your local products and warranties.
Why do you hear noises and rattles from the glazing?
The rattling of the balcony or terrace glazing is caused by the expansion of the aluminum profiles when they react to temperature changes. Possible expansion has been taken into account in the design of the glazing and its fixings, and frostbite does not affect the safety of the balcony, terrace or the operation of the glazing.
However, if you find the noise too loud, please contact us.
What are your glazings made of?
Our sliding and retractable glazing systems are made of glass that has been tempered for strength and durability, which is then mounted on aluminum beads, profiles and tracks. Tempered glass is 4-6 times stronger than normal float glass, and if the glass happens to break (which is extremely rare), it will break safely into small rounded pieces.
How much warmer will it be on the balcony or terrace with a frameless glazing system?
A glazing system works as a buffer between the balcony and the outside, but also as a buffer between your home and the outside. When it’s cold and windy, your glazing shuts out the cold winds and reduces air pressure. The glazing also captures the heat that leaks out of your home. Therefore, the temperature on the balcony will be slightly higher than the temperature outside.
Remember that a glazed balcony or terrace is still a ventilated space. During the colder months, we recommend that you supplement the balcony with a terrace heater for some extra heat.

Lumon Balcony Glazing Q&A

How much does a balcony glazing cost?
The price of balcony glazing depends entirely on the balcony to be glazed, including its size and structural requirements, as well as the method of installation. Many times, balcony glasses are also considered “just glasses”, even though it is a unique custom-made product designed according to the requirements and needs of the object.
What accessories can be purchased for the balcony glazing?
Various accessories are available for the glazed balcony, such as Visor blinds and a thermal mat that warms comfortably under your feet. Check out the selection in your country.
Can you get balcony glazing for the lowest floor of an apartment building?
You can also get glazing for the lowest, ground-level balcony of an apartment building. In this case, the best first step in purchasing is to ask a Lumon expert to visit the property on site, so you can plan the glazing together and also receive an offer for the purchase! Ask our experts for a planning visit.
Can you get balcony glazing for the top floor of an apartment building, the penthouse?
You can also get balcony glazing for the top floor of the apartment building. If the balcony does not have a roof, we can install a glass roof on the balcony. It is worth asking a Lumon expert to visit the property on site, so you can plan the glazing of the balcony together and get an offer for the purchase! Ask our experts for a planning visit.
How can a housing company get balcony glazing for all apartments at once?
The housing association or company can jointly purchase balcony glazing for all balconies in the building at once, which brings cost savings. Contact your nearest Lumon representative for more info.
What to do if the balcony glazing does not open?
If the first glass does not open, the gap between the first and second glass must be widened by pushing the second glass in the opposite direction. The opening should be wider, approx. 3 mm, so that the glass can be turned to the side. You can find the opening instructions in the user guides in pdf format here.
How tight is the glazed balcony? Is a balcony glazing completely sealed?
A Lumon balcony glazing system protects the balcony specifically from wind and storms. The system is not completely sealed, as the balcony also needs ventilation but provides sufficient protection against rain and dirt, which means that you don’t have to wipe your furniture and interior so often.
Read more below in the ventilation

In rainy and windy weather conditions, small amounts of water can enter the balcony or terrace. Keep in mind that the balcony is still a semi-outdoor space, even if the glazing provides very good protection.
How should a glazed balcony be ventilated? Does the glazed terrace need to be ventilated?
1-3 mm wide openings between the glass-panes are sufficient for ventilation of the balcony. Even between the roof and the upper profile, a gap can sometimes appear. This is due to height differences in the ceiling.
If you want more effective ventilation, you can open the first glass to the ventilation position.
Note! The balcony must not be sealed too much. Proper ventilation ensures that structures dry out and remain in good condition. If you want to reduce the opening in question, order transparent PVC seals from your Lumon office or online store.

A glazed balcony is a ventilated space because concrete and construction need to be aired in order not to become damp and spoil. With good ventilation, the structures dry out and remain in good condition.

The gaps between the glasses are 1-3 mm so that the balcony or patio can have good ventilation.

NOTE! Do not leave children or pets on the balcony without supervision, with the glazing in the ventilation position. Due to the risk of falling, the glazing is child and pet safe only when completely closed.
What sounds or rattles do you hear from the balcony glasses?
Balcony glazing reacts to temperature changes like any other aluminum or glass product. The possible frosting of the glazing is due to the expansion of the aluminum profiles when they react to temperature changes. This possible expansion has been taken into account in the design of the system and its attachments. Crashing does not affect safety or operation.
Is it dangerous if the glass pane is bent?
Tempered glass is flexible and can therefore bend slightly. In the normal case, a deflection of 3 mm/m is allowed, but on a very windy day, the glass panes can bend slightly more. Due to the flexibility of tempered glass, this type of glass can withstand impacts better than normal glass.
Why frameless?
Frameless balcony glazing makes your balcony feel more spacious and airy. You can also enjoy a panoramic view of your surroundings without any frames or vertical profiles obscuring the view.
In addition, the facade gets a stylish look that does not change the style of the building significantly. At the same time, space is left for architects and developers to create new unique facades, as the glass can be obtained in different colors and textures.

Lumon Terrace Glazing Q&A

Does glazing the terrace require a building permit?
As a rule of thumb, it can be said that a building permit must be applied for a glazed terrace. However, there are differences in practices between building inspections in different localities, so we encourage you to contact a Lumon expert, who will be happy to help with permit matters.
What kind of foundation does a glazed terrace need?
Above all, a glazed terrace needs a frost-free foundation. In most cases the terrace can be built on an already existing patio.
How much does glazing the terrace cost?
A Lumon terrace glazing is always tailor-made. The price of Lumon terrace glazing is influenced by high-quality raw materials and our service model, which covers everything from design to installation and user guidance. Ask our experts to visit the site for a free planning and cost estimate visit. During the planning visit, you will receive more information about the purchase of glazing and an offer for the glazing that is just right for you.
How long does it take to install a terrace glazing system?
The installation time depends on the scope of the work. The installation of terrace glazing doors takes a professional one working day on average. If it is a complex terrace including foundations, aluminum frame, glass roof and doors, the work duration is naturally longer. Ask for an estimate of the work duration in connection with the cost estimate.
Can the terrace glazing be locked from the outside?
When designing the terrace glazing, the opening directions of the glass walls are defined according to the customer’s needs. It is possible to choose a key lock for Lumon terrace glazing, which enables the glazing to be locked from the outside as well.
Is the glazed terrace a warm space?
Lumon terrace glazing has a durable aluminum structure and simple glass panes, so in winter at night or when no sun, the temperature drops close to the outside air. After glazing, the terrace is therefore an uninsulated, cold space. The furniture of which must be adapted to the outdoor conditions. However, the glass terrace substantially reduces the amount of dust, wind and snow that enters the terrace. However, the glazed terrace heats up significantly faster when the sun is shining, causing the temperature difference between the outside space and the glazed terrace to increase.
Is the glazed terrace hot in the summer, especially if the terrace has a glass roof?
Naturally, the terrace heats up with the summer sunshine, but you can make it easier by opening all the terrace glazing, so that the draft cools the hot air a little. Visor blinds in the glass roof and doors also prevent direct sunlight and temperature rise.
Is the terrace glazing safe?
The glass is 6-12 mm thick tempered glass that requires a strong impact to break. Tempered safety glass withstands shocks, bending and temperature fluctuations many times over compared to ordinary glass. When broken, tempered glass shatters into small, blunt-ended chips that do not pose a serious risk of injury.
Is the glazed terrace a sealed space?
Lumon terrace glazing protects the terrace from wind and storms, but the glazing is not completely sealed, as the terrace also needs ventilation. On rainy and windy days, a little water can get on the terrace, because the terrace is still a semi-outdoor space, although better protected than before. There is usually an opening between the Lumon glass roof and the top profile, the size of which depends on the height difference of the roof. It is part of the normal installation method. Read above more about ventilation.
Is it possible to get glasses in different shades and colours?
If the thickness of the terrace glass is 6-8 mm, the following shades can be chosen for the terrace glass in addition to clear glass: green, gray, brown, satinato and stippolyte.
Can the aluminum parts of the terrace be available in different colors?
The terrace glazing and roof profiles are polyester powder coated and there are three standard colors to choose from: white (RAL9016), light gray (RAL9006) and dark gray (RAL7024). For a special order, the colour tone can be selected from the RAL colour chart, in which case there are a total of 210 different colour options.
What are retractable glass walls? How do they work?
Lumon retractable terrace glazing are glass walls for your terrace or patio that slide easily along a low track and fold open. The innovative system means that you can have a fully protected sunroom or terrace, an open and breezy patio space, or a partial windbreak – simply by positioning the glass walls in different ways! Lumon retractable glazing is easy to use. Simply use the handle to open the first panel, and then slide the remaining panels along the track and fold them open against the first panel.
Is a glazed terrace a four season sunroom?
Lumon terrace glazing is better understood as three season rooms rather than four season sunrooms. Unlike a four season sunroom, which is typically just a regular insulated room with standard double paned windows, our glass walls can slide open and retract fully for maximum flexibility.
Lumon terrace glazing is not intended to be a thermal space like indoor rooms but rather a protected outdoor space that enhances the comfort and usability of your patio while maintaining that essential outdoor flavour.
Can I use a Lumon sunroom in the winter?
In a milder climates, homeowners typically find that they can enjoy their terrace with a Lumon Glazing system all year round.
Colder climates have a shorter patio or terrace season, but depending on the orientation of the terrace, you might still find that you can use it on sunny days in the winter.
In both climates, adding a heat source (such as a terrace heater, electric fireplace, or other heat source) to your Lumon terrace glazing can extend the patio season substantially.
Can I use the retractable terrace glazing system as the exterior wall of my home?
Unfortunately not. Our glazing systems are single glazed, tempered panels with 2-3mm gaps between the glass to allow for adequate ventilation of your outdoor living space. They are not thermally rated to act as an interior-exterior barrier.
Can I use the terrace glazing system as an interior wall inside my home?
Yes, we have done many interior applications.
Do you have covers or roofs that retract?
No, our roofs are fixed structures to eliminate issues with snow load, wind load, and drainage. However, our glass walls are fully retractable.
Can I lock my glazing?
Yes, every type of terrace glazing can be equipped with a locking mechanism.
How do I clean my Lumon glass roof or patio cover? Can I use a pressure washer on the roof?
We do not recommend the use of a pressure washer on your glass roof, as it can damage the rubber seals that hold your roof panels in place. It’s best not to use a pressure washer on your glass walls either.

For both the glass roof and the glazing systems, we recommend using mild household cleaning products or soapy water on the surface. Cleaning glass with a long-handled squeegee will give you the best results.