One of the most important step that determines the proper functionality of the window is to measure the window properly before the purchase.
Therefore, in order not to take responsibility for any errors while the measurement of the window, DRUTEX recommends to delegate such a work to licensed people or assembly companies.
This step provides the Buyer with a guarantee that the window will then be properly placed in the window’s hole and there will be appropriate assembly margin (space) left, which will help to avoid any complaints in the future. If you however decide that the measurement will not be carried out by the licensed person or assembly companies, such a measurement should be subject to and comply strictly with the guidance included in the instruction manual of the window. It is important that the window for assembly should have sizes that enable its proper setting , leveling on so called backing blocks or window slat. Between the wall and the window there has to be a gap, which is so width that after the assembly it guarantees the possibility of extending the window under the influence of the temperature changes or humidity. The width of the gap should be dependent of the type of the material used for the production of the window as well as its size and colours of the profiles (PVC windows covered with the dark veneers are more subject to heat and thus faster deform).
Proper fitting of the window should therefore be preceded by a thorough measurement in several places of the window and checking whether the frames have right angles. Checking this id related to the necessity of measuring the diagonals of the hole and comparing their length.
If there are any differences, this means that none of the angles has 90 degrees. It is also important to measure the height of the hole from inside and outside and check the setting of the internal and external sill, because there are often many discrepancies. By the measurement it s also crucial to consider the space for the threshold slat which is equal to the height of the slat. The overrun of the established minimum values is not recommended, because it is impossible then to produce the connecting joints in case of a narrow gap. A gap which is too wide affects unfavourably and even may prevent anchoring the window in the wall.
Optimal gap values are given in the table below: