In accordance with the recommendations for energy saving according to the current state of the art summarized in the European recognized rules of the profession, the regulations on thermal protection of 1995 and ENEV 2002, RAL, DIN 4108, technical guidelines of the association of the association of glassmakers, metal construction and carpenters (Excerpt from the official interpretation of German regulations) . Most European countries have adopted the same guidelines, adapted to local regulations.


What does it do?
RAL – assembly mainly aims at saving energy and proper
installation, to prevent the negative occurrence of moisture and its consequences.
Modern profiles have largely solved the losses through the windows or doors themselves – profiles and IZO – glass, but an increasing problem arises about the inadequately made connection between the window and the wall. Because of this, too often, only after the installation is energetic
effective windows, the moisture that causes molds and fungi to appear, due to the disrupted flow of thermal bridges, the so-called isotherms.


360g water within 24h
Within 24 hours, approximately 360 g of water condenses through an opening of a joint of width 1mm and length 1m, which is not vapor-proof insulated from the inside, into the building element – wall!
This can lead to mold, fungus, rot, or water leaking from the wall beneath the newly installed window!


What are isotherms?
Isotherms are lines that connect points of the same temperature by which calculations can be used to show the distribution of temperatures within building elements. The most famous
the term in the isotherm is a temperature point of 9.3 C, as a value
on which moisture from the air condenses and creates so-called dew,
which, depending on the amount of humidity in the room, also creates larger accumulations in the form of running water. That’s what we see! What we don’t often see is this kind of birth within ourselves
insulation heights, most commonly pur-foam, used as thermal and sound insulation when installing windows.


Installation of joinery according to RAL guidelines:
– the joinery and the wall (intermediate space) must be kept dry
– the window should be positioned on the correct isotherm line
– the flow of water vapor into the insulation (water and vapor permeability from the inside to the gap) should be prevented, especially from the inside
– flowing water or rain penetration from outside should be prevented, watertightness from the outside to the intermediate space
– to ensure the unhindered exit of water vapor from the intermediate space into the atmosphere, the vapor permeability from the intermediate space to the outside

Four sealing systems have been developed:


1. Sealing system using RAL PVC slats
2. Foil sealing system
3. Sealing system using sealing tapes
4. Foil sealing system and expansion seal