At what stage of the new construction windows installation

The order of work during the construction of the house is clearly defined, and it is better to strictly adhere to it. And this applies to Euro Windows, both plastic and wooden. At what stage of construction it is better to install Windows, and what will be the consequences of installing translucent structures at other times, we will tell further.

It is common practice in private construction to install Windows just before winter in bare walls to close the inner shell and be able to perform finishing work, usually wet and dirty. This is a common mistake in the art of construction.

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Irreversible consequences of the “Amateur” in the  new construction windows installation


Irreversible consequences of window installation


Ideally, if the installation of Windows and doors will be carried out after the screed and internal plaster is dried, but before the insulation of the external wall is installed. This sequence of work will ensure that the insulation layer around the Windows does not accumulate excess moisture (which in winter will lead to condensation in the insulation layer, then freezing it in the foam layer, and, consequently, degradation of the cellular structure of the mounting foam).

In the case of wooden Windows, excess moisture can cause the window frames to swell, cracks in the painted surface, and even frame connections, as well as corrosion of hardware components. Remember that Windows is designed for “normal” operating conditions, which range around an internal temperature of 20 degrees Celsius and relative humidity in the range of 50-60%. Very often, the provision of such terms of use is the starting point of warranty documents for manufacturers of metal-plastic Windows.


At what stage of construction should Windows be installed?


Wooden Windows. It is better to install them after the completion of “wet” work inside the house. If you install them first, the high humidity level in the room (about 90%) can cause irreparable damage to the wooden frames. Although manufacturers claim that modern wooden Windows are resistant to moisture from precipitation and do not deform, they do not recommend their installation before performing plaster and screed. Some of them even warn that the guarantee offered for Windows made of wood is no longer relevant if “wet” work was carried out in wet, poorly ventilated and poorly heated rooms after the installation of joinery.

new construction Wooden Windows

The Windows are PVC. It does not matter whether they are planned to be installed before or after the “wet” work. It should always provide effective ventilation of the room (if necessary, and heating), so that moisture does not condense on the surface of the double-glazed window, because it can then go to the slope and subsequently provoke the appearance of mold.

The Windows are PVC

“Wet” work in winter. Often the construction work is completed in late autumn and the installation of Windows and finishing work falls on the winter period. In this situation, it is better to choose plastic windows that can be installed at any time of the year (although you should avoid days when the temperature falls below -5 °C, even if winter installation foam is used for sealing, which can work at temperatures up to -10 °C). If the winter is cold, it is best to move the installation of plastic windows to the spring period. Very low temperatures will cause the PVC to become brittle, which can lead to cracking of the profile during transportation, unloading, and installation.

With the installation of wooden Windows, it is also better to wait until spring. However, if the Euro Windows is already inserted, and there is a desire to finish the house in the winter, it is worth considering whether to replace wet work with dry. Laying drywall and drywall slabs does not have a big impact on the humidity in the room, and also does not delay further finishing work. When work is interrupted for the winter, and the Windows are already installed, it is important to ensure ventilation in the premises, otherwise, the accumulated moisture will condense inside the house – most likely on the Windows.


The most useful sequence of work when installing new Windows


Thanks to this sequence, it will be possible to avoid contamination or damage to the window, increased humidity in the house, and unnecessary duplication of work (correction of previously performed slopes damaged during the installation of Windows).

Installation of Windows before or after plastering

Before performing the plaster. If finishing works will be carried out in the spring and summer, Windows can be installed before ” wet ” works. They must be shielded with a protective film, or the sash can be removed during plastering and the frames carefully protected. You can also install Windows, plaster the slopes and corners, and then, after protecting the Windows with a special film, plaster the remaining wall surfaces. Applying plaster requires temperatures above 5 °C, so when planning this work for the winter (especially gypsum plaster), you should previously install Euro Windows. This sequence of works is acceptable if you decide to install plastic Windows. With the installation of wooden Windows, it is better to wait until the plaster is completely dry. If Windows is inserted in the fall before plastering, it should be carefully screened with film and left open to allow moisture removal.

Installation of Windows after plastering

After plastering. It is best to plaster the walls inside, leaving the slopes and corners unpainted. After their drying, Windows are installed, and after drying and curing the foam, the slopes are plastered. This approach is particularly appropriate for wooden Windows. Then it is possible to avoid their possible contact with excess moisture from the drying of the plaster. Sometimes, however, plasterers do not want to agree to complete the slopes. If it is planned to install drywall, then a team of drywall installers can help with finishing the window opening. After installing the window, the cut-out drywall plates are glued to the opening in a certain way. You can, of course, completely plaster the walls and slopes, but then it will be difficult to install Windows without compromising the plaster.

Installation of Windows after performing ” wet ” work in interiors has another advantage: the surface of the frame and double-glazed Windows are not subject to contamination, scratches, and permanent damage by employees of another construction team. Unfortunately, there is a risk of not avoiding this when installing thermal insulation around the window frame or window sill. Therefore, before starting work on insulation, you should protect the window along with the frames with a layer of a special film.

Ideally, the installation of Windows should be made after the completion of ” wet ” work, but before finishing the facade work. However, in practice, the desire or need to settle in a new house as soon as possible often forces you to change the order of work.


Installation of Windows before the end of the facade or after


Installation of Windows before the end of the facade or after

Single-layer walls. In homes with this wall structure, Windows can be installed both before and after plastering the facades. The best solution is to install Windows before applying external plaster. Before starting finishing work on the facade of the window should be carefully screened with a film to protect against splashes of solution. Installing Euro Windows after applying plaster on the facade can mean performing the same operation twice – plastering slopes. In this case, it is impossible to avoid damage to the previously applied layer of plaster, especially if a vapor-permeable or expanding tape is placed on the border between the window and the wall. You can also do the same as during the execution of the internal plaster-leave the unfinished slope and complete this work after installing the Windows. However, it can be harmful to the aesthetics of the finish if the plaster layer differs in hue from the rest of the coating. It is better to organize the work so that the Windows are installed shortly before finishing the facade. In this case, it is easier to properly seal the seam between the window and the wall, and finish the slope beautifully, so that all the Windows are finished the same way and have an identical visible part of the frame, and the slopes are joined at right angles. The pre-installation of Windows will allow the correct fit and sealing of window sills.

Installation of Windows

Two-layer walls. In such walls, it is better to install Windows before warming the facade. Because then you know where to cut the foam plates. They should be located so that the joints in the corners of the window do not overlap, and you should also provide for the imposition of reinforcing mesh in the corners of the window opening and strengthen the corners with a perforated corner. The thermal insulation layer should cover the window frames by 2-3 cm. All these steps would have to be repeated, installing Windows after warming the walls. In the case of Euro Windows installed in the wall without insulation, it is easier to seal the joints between the window and the wall. If the insulation is done earlier, you should leave a reserve in the insulation layer in the light of window openings, but completing the work after installing Windows can be cumbersome and time-consuming.