Fitting Window Sill: Technology and Necessary Tools

Fitting Window Sill: Technology and Necessary Tools

To carry out the fitting window sill and slopes on a plastic window, it is not necessary to have certain skills and abilities. Even a novice master can handle this. To achieve a good result, an important step is the selection of the necessary components.

When fitting window sill, you will need to purchase not only the plate of a certain type itself, but also connecting elements, as well as a double-sided end cap. The last element is represented by a strip with two spouts, used for decorative framing of the end sides of the window sill. The plug is divided in the middle, fixing one part to the right, and the other to the left of the plate. Connectors are used to join the window sill at an angle and join it along its entire length into one integral structure.

To carry out the installation of the window sill
To carry out the installation of the window sill and slopes, you will need to purchase connecting and fastening elements

Slopes are used to frame the side elements of the window opening. They cover the assembly seams of the frame with the opening and give the window a complete, aesthetic appearance. The most common option is plastic slopes, which are characterized by strength, reliability, good thermal insulation properties, undemanding maintenance and quick installation.

To protect the window frame from the negative effects of the environment, it is necessary to install an ebb from its outer side. The structure can be made of aluminum, plastic or metal. The second option is the most widespread. Metal ebb tides are the most budgetary and short-lived, because they have a low level of resistance to the negative effects of atmospheric conditions.

Aluminum drip tides are more durable, have reliable protection against mechanical damage, thanks to a special spraying on the surface, they absorb the noise of rain drops.

Methods for fitting window sill

Before installing a window sill, you should study the possible ways of installing the product.

The oldest option for installing a window sill on a plastic window is to fix the product with a special compound. Today, this method is used extremely rarely due to the more convenient and reliable methods that have appeared.

fixing the window sill under the window frame
All installation options are very reliable, they differ only in the way of fixing the window sill under the window frame

The easiest way is to install a window sill with your own hands by using self-tapping screws. Previously, holes are made in the window frame where hardware must be screwed in. For greater tightness, the joints should be treated with an acrylic-based compound. To achieve maximum rigidity and reliability of the structure, during installation, special gaskets are placed under it, and the resulting gaps are filled with polyurethane foam.

Installation of the window sill can be carried out using spring metal brackets. These fasteners are fixed to the support profile by means of self-tapping screws. Then plastic board is installed in the groove that has formed between the bracket and the window frame.

After installing the window sill
After fitting the window sill, the gaps must be sealed with silicone

There is an option for fitting window sill with your own hands, which does not involve the use of fasteners in the form of brackets and self-tapping screws. The plate is installed in the seat. Wooden wedges are driven under it until its surface is pressed as tightly as possible against the window frame. In this case, it is necessary to constantly check the level of the structure. The window sill should have a slight slope towards the room in order to exclude the possibility of condensation entering the frame.

All the free space that has formed is filled with polyurethane foam. This type of installation is the longest, but it can be considered the most reliable.

Important! After blowing out the space under the windowsill with polyurethane foam, a weighting must be installed on the slab in order to create the necessary resistance at the time of material hardening.

All window sill installation options have their pros and cons. They differ only in the method of fixing the product under the window frame, and all other stages are identical for them.

How to fitting window sill: the preparatory stage

How to install the window sill correctly? First of all, it is required to prepare the tools necessary to ensure maximum efficiency of the work, and the accessories, thanks to which the installation process will be simple and convenient.

window sill either
You can cut a window sill either with a jigsaw or with a grinder

To install a window sill, you will need product itself, a corner, a building level, a marker with a tape measure, a sealant for joints and seams, foam to fill the gaps between the plate and the wall, a jigsaw, a perforator, a screwdriver, screws, self-tapping screws.

Many are interested in the question of how to install a window sill if the window is already standing. First of all, the necessary measurements are carried out. Carrying out this stage is extremely important, since the strength and appearance of the future structure will depend on the correctness of its implementation.

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The length of the sill should be several centimeters longer than the distance between the side slopes. This is due to the fact that the product is wound 2-3 cm into the grooves made in the wall. The width of the product is selected taking into account its protrusion above the radiator, which is installed below. This value should not exceed 8 cm. Otherwise, hot air will not rise to the window from the radiator, which will cause condensation.

The distance between the window sill and the stove should also not be less than 10 cm. Otherwise, a closer location will cause a violation of air circulation, which will worsen the microclimate in the room.

How to fitting window sill: taking measurements and preparing a window opening

Before placing window sill, the product is prepared according to the measurements. The required length and width are plotted on the slab using a marker. Then, using a jigsaw, structure is cut. Work must be carried out in protective goggles and work gloves, since plastic is a very fragile material, so small particles can fly out during intensive cutting.

The sawing process can also be carried out using a special hacksaw or grinder. In the first case, the process will be lengthy. Using a grinder, you can achieve perfectly smooth edges of the product.

Important! When cutting, do not put excessive pressure on the board, as this can lead to cracks and chips on the product.

Before properly installing window sill, you need to prepare a seat for it. Since the structure is mounted with some entry into the side niches of the opening, it is necessary to make corresponding grooves for it on both sides in the wall. The process is carried out using a chisel and a hammer. The resulting openings are thoroughly cleaned of debris and primed.

Before you install window
Before you install the window sill, you need to saw it according to the measurements.

After that, special spacers or wedges must be attached to the window frame, which are fixed for reliability with a gypsum solution. The installation elements must be positioned in such a way that the required inclination is ensured. Then do-it-yourself installation of the window sill on the seat is carried out and it is checked how smooth and tight it becomes. If necessary, the edges of the structure are trimmed.

Important! The window sill should have a slope of 1-2 ° towards the room.

The process of installing a window sill

As mentioned earlier, there are several ways to fix the product when installing a plastic window sill. At this stage, the most popular and reliable option is being considered, involving the use of wooden spacers and polyurethane foam.

How to install a window sill without a support profile? The product is mounted on a prepared seat. Wooden beacons with a pitch of 80 cm are installed under the structure. They ensure the horizontal structure of the structure, which is controlled by the building level.

indow sill is selected taking into account
The width of the window sill is selected taking into account the protrusion above the radiator

Wooden blocks are located under the slab at the front end, the distance between which should be about 50 cm. It is necessary to ensure that the supporting elements do not go beyond the plane of the wall. The distance between the wooden blocks and the side walls should not exceed 10 cm. Before placing the window sill, the horizontal position of the window sill is checked again. If the value does not correspond to the previously obtained result, the pads are adjusted in thickness.

To pre-fix the window sill, the cavity between the slab and the concrete surface must be filled with polyurethane foam, a can of which is placed in warm water a few minutes before starting work. To prevent the binder from lifting the window sill at the time of expansion, a load is placed on the slab. Further, all the free space is thoroughly filled with foam.

Important! Do not overload the structure so that the window sill does not deform.

In this position, the window sill must be left alone for 2-3 days. Excess polyurethane foam should be removed with a clerical knife. If possible gaps are found, they are filled with acrylic sealant. At the end of the installation process, to give the structure a complete look, special plugs are mounted on the glue at its ends. After installing the window sill, you can proceed with the installation of the slopes.

Fitting window sill on the balcony

Modern balconies and loggias are actively glazed through the use of metal-plastic double-glazed windows. This process is accompanied by the installation a window sill. Installation of a window sill on a balcony is mainly performed at the time of glazing. However, you can do this later with your own hands. How to install a plastic window sill with your own hands so as not to regret the work done?

How to install a window sill on the balcony if the window is already standing? To do this, you need to prepare metal brackets. They are needed in the absence of the possibility of establishing a structure under the existing window. The metal brackets should be fixed to the parapet with anchors. These elements will help to strengthen the sill, which will lead to an increase in payloads.

window sill on the balcony
Polyurethane foam for filling voids after installing the window sill on the balcony is not used

The distance between the metal brackets should be no more than 1 m. Using a building level, check the horizontal position of the fasteners. Before fixing the holders, to simplify the installation process, the thread is pulled strictly horizontally.

After the brackets are fully fixed, the window sill is installed on the loggia or balcony. It is fixed at the bottom of the slab with self-tapping screws. After the completion of the installation process, the structure is treated with a sealant. The procedure is performed in order to get rid of the cracks that form as a result of the presence of irregularities around the edges.

Important! When installing a window sill on a balcony, unlike installation in a window opening, foam is not used to fill the voids.

The procedure for replacing a plastic window sill

Over time, a PVC window sill can be damaged or lose its original appearance as a result of the appearance of abrasions and stubborn dirt. In this case, it is important to know how to change the window sill.

Before removing the plastic window sill, preparatory measures are performed, which are determined by the type of slopes. They can be monolithic, that is, installed using plaster, or panel (made of PVC plates or sandwich panels). The window sill is mounted under the slopes, therefore, before removing it, they are partially or completely dismantled.

When using plastic slopes, the profile used to frame the corner is removed. Then the finishing panel is carefully opened, for which the sealant seam is pre-stitched. Further, the mounting foam is removed from the plane of the support rails, the junction of the edge of the structure is cleaned. This is necessary for easy removal of the window sill.

installing window sills
If there is not enough experience in installing window sills, then it is better to turn to professionals

If the slopes are finished with plaster, to replace the plastic window sill, draw two horizontal lines along the edges of the opening with an offset of 25 mm from the top of the window sill. According to this marking, trimming is performed using a angle grinder with a diamond wheel. The process is carried out with the utmost care to avoid the possibility of damage to the frame. Using angle grinders, an undercut is carried out along the plane of the wall, the depth of which is equal to the width of the protrusion of the structure behind the slope.

Helpful advice! The installation depth of the window sill usually reaches 30-40 mm, therefore, to dismantle the slopes, you will need a circle of 180 mm.

Since the slab with the modern method of installation is not attached to the window frame or support profile, but is fixed with foam, it will be quite problematic to simply tear off the product. Before removing the window sill, the structure must be cut into fragments using a jigsaw. If the slab is planted on a cement mortar, an angle grinder should be used to separate the structure. Next, each element is removed from the footprint.

If the window sill has been fixed to the delivery profile, then the sill is removed from the outside of the window. Several screws must be unscrewed from the profile.


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