Dear Visitor !

If You are about to change fenestration, you must have been thinking about these questions:

• What kind of profile do I choose, and what is an air chamber?
• What does thermal glass mean, and what is the U-value?
• My windows can be changed without breaking down the walls?
• etc.

Please allow me to help You answering these questions.

In case of the plastic windows, the profiles are the metal structured, plastic covered elements which are used to make the frame and the structure of the window. The profile gives the thickness of the window and the number of the air chambers. The air chamber is the number of the airtight layers in the profile, it gives how many closed air layers are between the inside and the outside of the window.

You have to be careful about the profiles with fewer than 5 air chambers, because there could be large difference in the thermal insulation of the window-frame and the glass. So we would choose a good thermal insulation glass for nothing, because the heat goes out through the window-frame.
But the number of the air chambers isn't everything. The quality of a window isn't only depending on the fact that it is a 5 or a 6 chambers window.

Why is it good if a window is wider? It's not only important because of the thermal insulation. The more stable window structure increases the safety. The most important significance of a wider window is the acoustic insulation. The heavier the window, the better the acoustic insulation.

The most known parameter about the fenestration is the U-value (used to be K-value), which is the number of the measurement of the thermal insulation. More precisely, it measures the heat transmission, so the smaller is the number, the better the thermal insulation.

We have to consider a few more things about the U-value, because in the data of the different manufacturers, this unit does not always mean the same thing. Both the window structure and the glass have a U-value.

From the two values, we get the U-value of the whole window. The manufacturers often only give the U-value of the glass, because it shows better thermal insulation, so we have to pay attention to what number is being shown.

• The traditional double glazing set's value is U=2,8. From September 1st, 2006, we can't use this kind of glass in new building-ins. Unfortunately, a lot of company still offers it.
• The value of a double glazing set with thermal insulation metal layer is usually U=1,4 or U=1,3. Here the heat loss is half of that of a traditional glass. Do not choose a glass with worse insulation than this.
• The value of a double glazing set with thermal insulation metal layer filled with noble gas /argon/ is usually U=1,0. When the price is not really an issue, this glass is the basic equipment.
• With the three layered glass, the U-value can be U=0,6. This glass is also starting to spread. Beside the thermal insulation, they use it for the acoustic insulation too. But we have to pay attention to the fact, that the glass will be much more heavier. If the profile not suitable enough, the structure of the window could be overwhelmed, and it could ruin the window, because it couldn't take the weight of the casement. Also, the handling of the large casement demands more strength.
• The U-value of the window-frames are usually between U=1,0 and U=1,8.

Execution

Fenestrations can be placed in 4 groups by their placements

Placement in a newly-built building:
We fix the fenestrations through case, with retaining screws. In the surface left free during the masonry works - for the required heat insulation and statics - we make the gap gaskets with (winter, summer) PUR foam made specifically for this. In case of "Tessauer" cases or exchange flats:

Our co-workers do the demolition with special "demolishing saw", paying close attention to the already existing walls. With this kind of installation, the change of the interior and exterior parapet is needed, it doesn't need any post painting or masonry work. Also, the interior-exterior covering is always included in the price of the demolition/building-in (except for the request of the costumer). Change of the "Fix" case (double casement) windows:

Our co-workers do the demolition with special "demolishing saw", paying close attention to the already existing walls. But with this kind of installation, because of the old case structure, the change of the interior and exterior parapet, and mason corrections are needed. In this case, we hand over the work ready for painting. Building on "Fix" case (double casement) windows:

We only recommend this kind of placement, if the surface handling of the already existing case had happened in every 5-6 years, because with the installation of the new fenestration, we keep the old case. In this case, the interior and exterior gap covering is included in the total price. The whole interior case covering can be made from PVC or plasterboards basic materials, for this, please ask our company's seperate offer.

If you have any more questions about the technologycal content or the execution of the fenestrations, please turn to our colleagues with confidence.