• proper preparation of building openings that must be flat and dry
• joinery is installed on the outside line of the wall, i.e., on the proper line of the isotherms it is necessary to ensure waterproofing from the outside, as well as water vapor permeability.
• It is necessary to ensure that water (rain and other weather conditions) can’t penetrate inside the space between the wall and joinery, but at the same time allowing the minimum amount of vapor to easily excape outwards
• it is necessary to ensure waterproofing and damp proofing of the room in the space between the joinery and the wall 

Numerated above we can achieved in two ways:

• sealing tapes- special sealing tapes developed specifically for RAL mounting - tape is used to coat windows or other element (in particular the outer part of the profile facing the wall), and after installation it expands and thereby seals the space between the wall and the window. Such tapes have all the characteristics necessary for the RAL installation PUR foam and foil - the space between the wall and the element is carefully filled with

• PUR foam, and then on the outer edges of the windows we use a special glue to bond the window with waterproof and breathable film, waterproof and vapor-tight foil is being installed on the inner edges of the window. It is necessary to pay attention for the correct and accurate installation of foil and PUR foam.

PVC windows are extremely easy to care for and require minimal maintenance. But you should still clean and care for PVC windows regularly – especially the glazing.

To ensure long and lasting enjoyment of your PVC joinery we recommend this regular cleaning procedure:

1. Remove lime and mortar splashes!

Avoid lime and mortar splashes on the profile, glazing and fittings. Both the profile and the glazing could be damaged and fittings jammed as a result of solidified mortar residue.

2. Ventilate rooms several times a day!

An inflow of colder air lowers the relative humidity in the room and creates a healthier room climate. Preferably ventilate the living area several times a day, as a relative humidity of over 60 % can lead to mould growth.

3. Do not use caustic fluids

For normal cleaning of the frame surface use a solution of mild dishwashing liquid. Do not use scouring agent, paint thinner or . For stubborn dirt always use special cleaning agents that can be obtained from the window supplier or from a window specialist.

4. Regular cleaning on the outside!

Clean the outside of your windows regularly. Pollen, tar or ferrous particles may be burned in by the sun’s rays. Once a layer has deposited it is not easy to remove.

5. Lubricate fittings!

Lubricate the fittings at least once a year to ensure ease of movement at all times.

6. Tighten handles!

Always tighten loose window handles. You can find the screws by lifting the cap under the handle and turning it out of the vertical into a horizontal position.

7. Care for the seals!

Rub the seals in the frame twice a year with sealing agent e.g. talcum, deer tallow or silicon oil (from specialists), to keep them soft and in good working order. Damaged seals have to be replaced.

8. Clean drainage openings!

Check the drainage openings in the frame profiles every now and again. Cleanliness is important for satisfactory drainage.