Installing a window sill after installing a window. How to properly install a window sill on plastic windows with your own hands: step-by-step instructions, video

An indispensable attribute of any window system is the window sill. In addition to performing decorative function, it additionally protects the room from cold penetration in the area of the stand profile. The most widespread are plastic (PVC), wooden and partly granite window sills. But since plastic products cost less, have high performance characteristics, and are lighter in weight, they are in great demand. Carrying out installation work does not require special skills, so installing a window sill can be done with your own hands if you have the necessary tools.

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When does a window sill need to be replaced?

A large selection of polyvinyl chloride slabs allows you to choose the product required characteristics according to the following parameters:

colors, imitation stone or precious wood;
dimensions in mm: width 110–800, length 4050–6000, thickness 18–22;
a specific manufacturer;
affordable cost per linear meter;
quality and composition of polyvinyl chloride;
resistance to wear and damage, heat, and ultraviolet radiation.

There are several reasons why the owners of an apartment or house decide to install a window sill on their own:

The windows are in good condition, but the panel has become unusable - damaged, scratched, pressed through.
The previous product was not secured correctly.
After the renovation, there was a desire to install a PVC plate of a different color, more suitable for the new interior.
Changing the width of the panel. Replacing it with a narrow product that does not block the movement of warm air from heating element upward, thereby improving air circulation. The window frame warms up and does not become damp, which reduces the likelihood of mold growth.
It is difficult to find a specialist to perform small volumes of work in the form of one window sill.
The desire to carry out the installation yourself, saving some money.

To successfully install the window sill on your own, you will need to additionally purchase two end caps; they are attached to the side sections of the product at the final stage of work. And when connecting two window sill panels at an angle or in a straight line, purchase a universal PVC connector.

Tools and materials

The quality and class of tools and materials used determine the quality of the work performed, the ease and convenience of its implementation, and the service life of the entire window structure. First of all, you will need to prepare:

PVC window sill;
building level with measuring tape, pencil;
electric jigsaw, grinder;
a container of polyurethane foam for a special gun;
stationery knife;
wooden wedges of different thicknesses;
mounting brackets, screws;
chisel with hammer;
spatula with primer.

Preparatory work

Before installing the window sill, you need to prepare the place , side slopes and the lower part of the window opening. The recesses in the slopes provide additional support for the canvas on the sides, so the panel should extend slightly into the walls. To do this, attach it to the wall and make corresponding marks on each side with a pencil (marker). Next, select the grooves, going deeper by 1–2 cm. This work is done to eliminate the formation big holes and excessive damage to slopes should be carried out very carefully.

If there are metal perforated corners, horizontal cuts in the slopes will be correctly made using a grinder, then the cut will be absolutely even. The rest of the recess is completed with a chisel and hammer, which are well suited for working on any soft surfaces, such as gypsum plaster. If the walls are made of concrete, then the side grooves are made with a hammer drill with a special attachment in the form of a chisel.

Only after this is the bottom of the window opening prepared with the installed stand profile, to which the window sill is attached and aligned with the window. The surface is cleaned of remnants of plaster, concrete, brick and dust generated during work with slopes is swept away. For better adhesion to the polyurethane foam, the prepared base is moistened, but it would be wise to use a primer, applying it over the surface with a brush. Having soaked all the holes, bulges and cracks, it will reliably hold the base together..

Taking measurements and trimming

Before starting installation, you will need to take measurements, the correctness of which will determine appearance, strength future design. Therefore, in addition to the characteristics and properties of a product made of polyvinyl chloride, it is necessary to take into account such nuances as its thickness and the distance between the battery and the window sill. Otherwise, the stove hanging over the heating device, disrupting the air circulation, will cause a deterioration in the microclimate in the room.

The length of the installed panel must exceed the distance between the slopes and extend into them to a depth of two to three centimeters. The width is selected arbitrarily, but since the window sill is located above the battery, the front protrusion is made no more than 8 cm, which is necessary for normal heating and movement air masses inside the room. For this reason, the vertical distance from the battery is maintained at least 10 cm.

Be sure to leave 5 mm gaps on the sides of the window sill. Their presence will allow you to avoid damage caused by deformation of the panel when it is heated by the battery or under the influence of sun rays. To maintain the required distance, beacons 5 mm thick are used, which are removed at the final stage of work, and the cracks formed in their place are sealed with sealant.

In accordance with the measurements taken, a window sill of the required length and width is cut out of the workpiece. To do this, it is better to use a jigsaw or grinder, a hacksaw with a fine-toothed metal saw, which will allow you to get perfectly smooth edges. Since plastic is a fragile material, you should cut carefully without using excessive force.

If the above requirements are not met, chips and cracks will form, and the edge of the panel will turn out uneven. The work must be carried out in compliance with all safety measures, therefore, to protect against small particles formed during intensive cutting, it is necessary to wear work gloves and goggles.

Installation instructions

There are several ways to install a window sill.

Most old method involves its fixation through special staff. Today, due to the emergence of more convenient, reliable mounting options, it is rarely used.
Using self-tapping screws. IN window frame prepare holes for hardware. After treating them with acrylic sealant, the edge of the window sill is placed under the window and secured with screws.
On spring brackets. The fasteners are screwed directly to the substitution profile and the product is installed in the resulting groove, between the frame and brackets.
Wedging using beams. They are driven under the panel all the way, trying to ensure that its edge is pressed against the frame. This method It is considered the most labor-intensive, but at the same time reliable.

Additional rigidity of the structure, regardless of the chosen installation method, is provided by placing special pads under the window sill and filling the resulting voids with polyurethane foam.

It is easier and more convenient to fix the product on polyurethane foam, having previously leveled it on wooden or plastic stands. They can be prepared in different thicknesses, lengths and widths, which makes height adjustment easier. If the space between the base and the window sill exceeds 100 mm, then it is partially filled with mortar, while leveling the surface. A gap of a few centimeters is enough for the foam.

The supports are installed, maintaining a distance of 400–500 mm between them, but in the amount of at least three units - one in the center, two at the edges. The thickness of the substrate is chosen so that the window sill fits exactly between the supports and the lower edge of the window. Next, special bent at an angle screws onto the stand profile to hold the panels. mounting plates. By pressing the front of the workpiece, they minimize the likelihood of a gap forming. Instead of plates, you can use long screws.

Having prepared the supports and installed the panel, preliminary alignment is carried out relative to the horizon. If the window sill space is planned to be filled with mineral wool rather than polyurethane foam, then the slab is removed and the supports are glued to the base with silicone glue.

Having removed part of the protective film on the sides - in the places adjacent to the slopes, end caps are attached to them. The panel is carefully inserted and, resting on the backing, is inserted into place. With a light tap, the window sill is adjusted to the window until it stops, thereby aligning it in width.

The position relative to the horizon is re-checked in the transverse and longitudinal directions. Ideally, the air bubble of the level should be located in the center, but a slight offset towards the room is allowed. Then the presence of a slope will prevent the accumulation of moisture.

When installing a window sill on a balcony or loggia, there are some nuances. Since there is no reliable support, the workpiece has to be secured using brackets. They are pre-mounted on the stand profile or lower on the wall using self-tapping screws with press washers. The minimum number of brackets per window sill is at least 4 pieces. It is recommended to maintain a distance of no more than 25 cm between them. To ensure reliability of the structure, additionally fasten the panel with the frame with screws.

The final stage of work

When the polyurethane foam hardens, it increases in volume, and the window sill may rise and become deformed. Therefore, before foaming the window sill space, the panel is loaded using any available weighting agents - containers with water, books, collapsible dumbbells. They will hold it in place, and the foam will be squeezed out along the entire length. Surplus frozen foam cut with a knife and carry out the final finishing.

After installing the window sill, all detected gaps and cracks in the area of the slopes and at the bottom of the window are eliminated using silicone sealant. It is applied in a thin strip and compacted by running a finger over the top. Excess is promptly removed with a damp cloth. After drying, it will be more difficult to do this, and the result will be less accurate.

Excess dried foam is also removed, cutting it off with a utility knife to a depth of 1 cm. Next, the surface under the panel and large voids found are filled flush with the wall with ordinary plaster. Using glue for PVC products, install plugs at the ends of the window sill. At the end of all the work, after the final finishing of the slopes, all that remains is to remove the protective film.

As you can see, installing a window sill on your own does not require special skills. The only significant obstacle may be the lack of the necessary tools and the purchase Supplies(their remains may no longer be useful). Accordingly, the costs will be higher than the services of a qualified specialist.

Content:

What is important to know before installing a window sill with your own hands?
Preparing to install a PVC window sill
Video tutorial. DIY PVC window sill installation

Photo 1 - Plastic window sill photo

Practical, attractive and inexpensive plastic window sills Most often they are installed together with the same windows, although other design solutions are possible. Installation of window sills does not require special skills, but you need to follow the technology exactly and perform all actions carefully.

List of materials needed for installing a PVC window sill

What you need to know for a successful window sill installation

Before starting any work, you need to carefully study the accompanying documents for all materials and tools used, if you have not used them before. This fully applies to the installation of a plastic window sill.

For example, it is very important to know at what temperature you can work with polyurethane foam. This information is on the product label. When choosing this material, you should give preference to products with the lowest coefficient of expansion, which will prevent the window sill from rising. The ideal option is to use a spray foam gun. In this case, as a rule, professional material is used, which does not expand significantly.

If you are going to install a window sill in a window over 3 meters long, you will have to use additional parts that need to be carefully adjusted and glued, or special fillers for the joints.

Preparing to install a window sill

In order for the window sill to serve for a long time, it is important to correctly determine its dimensions. The width is calculated taking into account the following components:

Window sill width :

Desired distance from the inner surface of the wall. Experts do not recommend making it more than 15 cm, because it can become a hindrance. It is also important to consider the location heating devices. A window sill that is too wide can cause condensation to form on the side slopes and glass surfaces.
Another 2 cm is added for the entrance of the window sill under the window.

To determine the length you need to measure the window opening using a tape measure and add another 10 cm to this value. This is necessary so that the cut edges of the window sill are not visible.

Important!

After taking all the measurements, check them again. It’s better to stick to the rule: measure seven times, cut once. In this way, you will be able to avoid annoying mistakes, which are quite difficult and sometimes impossible to correct.

All that remains is to cut off all the excess and you can begin installation.

Video installation of a PVC window sill. Main stages

First you need to clean the surface of the window opening from debris and dust. This must be done carefully so that subsequent foaming is successful. The next step is to try on a window sill that has already been prepared to size. If necessary, it is trimmed in the right places.

Photo 3 - DIY PVC window sill installation

Next step- installation of a window sill. To do this, it is inserted into a special stand profile located under window frame, by 2 cm. Using a level, level the surface of the window sill and substitute wooden supports, which are necessary to ensure the design rigidity during operation of the window sill.

The window sill canvas is installed with a slight slope directed into the room. This is necessary so that when condensation forms or watering flowers, excess moisture does not stagnate, but rolls off the windowsill.

Photo 4 - Do-it-yourself PVC window sill installation

The next stage is foaming. It is quite important and must be performed with special care. Before proceeding directly to the process itself, the surface of the window opening must be moistened. This technique allows for improved adhesion and a more uniform distribution of the polyurethane foam.

First, the inner surface of the window sill and the junction with the mounting profile are covered with foam. This allows you to avoid the appearance of such an unpleasant phenomenon as cold bridges.

Photo 5 - Do-it-yourself PVC window sill installation

After this operation, experts recommend installing a small weight on the windowsill, which is removed after the foam has completely hardened.

Polyurethane foam is afraid of ultraviolet radiation, so it should not be exposed to sunlight. Even thin layer plaster or other material can protect it.

All that remains is to install the plug, cutting off the required length from the workpiece, lubricate it with cosmofen, and press it to the ends of the window sill. And on final stage you need to remove the protective film and fill all the joints silicone sealant, doing it very carefully.

Photo 6 - DIY PVC window sill installation

From the above, it becomes clear that even those who have a minimum of knowledge and skills in this area can cope with the installation of a plastic window sill. It is only important not to allow technology violations and not to rush.

When installing plastic windows, installation specialists regularly encounter a situation where customers do not know what a window sill is needed for - they perceive it as standard element window design. In fact, a window sill has many functions, depending on which the material for the window sill board is selected. Let's fill the gap in knowledge and tell you about the functionality of the window sill, its types, the advantages and disadvantages of the material from which it is made, as well as how to install the window sill on plastic windows with your own hands.

Initially, the window sill had four functions:

prevent the entry of cold air into the room in the area where the window structure connects with the base of the window opening;
level the difference between the bottom of the window opening and the frame that is installed on the gaskets;
collect condensation when window panes fog up;
cover the visible part of the wall in the opening.

Over time, the role of the window sill has expanded. He became:

decorative element in the interior of the room;
stand for flowers and various figurines;
table in the kitchen, desk or work table in the nursery, living room, bedroom;

support when washing windows and hanging curtains;
a business card of the owners’ wealth;
a place to watch the street and relax.

Based on how the owners see their window sill, the material from which it is made is selected.

Types of window sill

The construction industry offers a base for the window sill from:

natural (granite, marble) and artificial (acrylic or quartz based) stone;
natural wood (oak, cherry, pine, larch);
composite materials (MDF, chipboard);
plastic (polyvinyl chloride).

A natural stone

A window sill made of natural stone is one of the few interior elements that very clearly demonstrates the wealth in the house, the status and good taste of the owners. Him:

beautiful, respectable appearance that lasts until the end of operation;
a variety of colors and patterns, which allows you to fit it into any interior;
the highest strength - granite and marble are among the best minerals on the planet in terms of this indicator (second only to diamond);

no reaction to external influences in the form of temperature changes (does not burn and is not afraid of frost), high humidity, ultraviolet irradiation (does not fade in the sun);
has an unlimited service life - in old castles you can find stone window sills with a service life of several centuries;
easy to clean.

Natural stone also has disadvantages:

on polished up mirror shine the surface, despite its high strength, can be quite easily scratched with a sharp object (granite is more resistant to sharp objects);
marble is afraid of vinegar and acid (this mineral is essentially limestone). Tea and coffee stains are difficult to wash off;
both minerals accumulate radioactive radiation- in radiation-contaminated areas it is better to avoid them;
high level of thermal conductivity (granite - 3.5 W/(m x deg), marble - 2.9);
limited dimensions (a large slab is difficult to polish, transport and install);
in case of accidental damage (chip, crack), it cannot be restored;
heavy weight - the window sill-tabletop is in most cases supplied by tap through the window;
limited quantity color palette in granite (in fairness, we note that the natural pattern of the material is fantastic);
high cost of the product.

Fake diamond

An alternative to a marble or granite window sill is an artificial stone made from acrylic or quartz agglomerate. The product has a lot of advantages:

light weight - easier to transport and secure;
there are no restrictions in size - thickness and width;
high strength - higher than that of PVC and wood window sills, but lower than that of natural stone;
long service life;
by adding various components to the mixture, you can get unique colors and patterns that imitate various natural materials;
is not afraid of moisture, is easy to clean from dirt, does not absorb odors;
feels warm to the touch natural wood;
Can be restored using glue, heat treatment and grinding.

Flaws artificial stone related to its nature:

afraid of high temperatures - traces of cigarettes and hot dishes remain on the surface;
is destroyed when interacting with aggressive chemicals;
is easily scratched and abraded (it is afraid of abrasive materials), which is clearly visible on polished plain surfaces, especially on black, chocolate and dark gray backgrounds;
high cost, in some cases exceeding the cost of natural stone.

For information: the above damage can be easily removed by specialists on site, without dismantling the window sill. But it costs money.

Tree

Like granite and marble, wood is a natural materials and has the same centuries-old history applications in window construction. With the advent of artificial materials on the construction industry market, the position wooden window sills fell sharply, but still retained their fans and connoisseurs.

Wooden window sills have their pros and cons.

environmental purity of natural material;
durability during operation - do not break like natural stone, are not afraid of hot objects like plastic or acrylic board;
high level of thermal insulation;
beautiful color and original texture: the surface can be made glossy under modern styles interior design, or give the look of old wood - a country look;
high strength - can withstand the weight of a person and flower pots;
natural warmth both during direct contact and visual inspection.

is afraid of direct contact with water and wet rooms - the surface swollen with water is deformed, so such a window sill must be either painted or varnished;
constant care is required: first of all, regular and timely repainting;
does not tolerate close contact with batteries central heating(deformed) - if there is not enough distance from a constant heat source to the window frame, it is better to abandon the wooden window sill.

As for the price factor, specialists do not have consensus: some consider it a plus because of the affordable price, others consider it a minus, because, on the contrary, it is very high cost wooden window sills. Here, oddly enough, both sides are right. A window sill board made of pine is not too different in cost from plastic, while oak board costs about the same as natural stone.

Composite materials

Composites - chipboard and MDF - are intended to replace natural wood. However, alternative window sills are greatly inferior not only to wooden ones, which they are intended to replace, but also to all other types of window sills. The main problem is their ability to swell when in contact with water.

Protection of wood-based material with waterproof film is not very reliable. The film is easily damaged by sharp objects and is susceptible to high temperatures. In this regard, laminated MDF is more reliable material, but also costs more.

Polyvinyl chloride

A plastic window sill is a hollow panel with a thickness of at least 2.0 cm from two thin sheets(top thickness not less than 3 mm, bottom thickness not less than 2.5 mm), interconnected by stiffening ribs. The more ribs or thicker the sheets, the stronger the product.

Installing a plastic window sill allows you to:

save money - its price is lower than the cost of natural and artificial stone, as well as wood;

synchronize the service life of the window sill board with the plastic window;
get a window element of various designs that fits into any interior, including wood or natural stone;
provide good thermal insulation between the frame and the lower base of the window opening;
carry out all installation work yourself.

Among the disadvantages of PVC window sills it is necessary to note:

fear of high temperatures - traces of cigarettes and hot pots remain;
low strength.

At correct operation these deficiencies, as a rule, do not appear.

Please note that all types of window sills can be installed independently. Using the example of how to install a plastic window sill with your own hands, we will consider the general principle of organizing the work and describe the entire technology step by step, noting at the end the nuances of fastening this window element from other materials.

Materials and tools

The efficiency of the construction process depends on correct selection materials and necessary tools. To install a window sill in one window you will need:

window sill material;
polyurethane foam - poured between the window sill canvas and the wall of the house;
silicone-based plastic sealant - seals the joints between the window sill, window frame and slope panel;
perforated metal strip and self-tapping screws if additional fastening of the window sill is planned;
putty for sealing grooves in the wall;
plugs for the ends of the window sill;
wedges made of wood or plastic for the window sill (3 pieces per window).

Tools needed:

roulette;
putty knife;
mallet or rubber mallet;
a hammer drill for making a groove in the wall under the window sill;
one of the following tools for cutting plastic profiles. These can be: grinder - cuts quickly, accurately, with smooth edges along the cutting line; a jigsaw with a metal file as a cutting tool; a hacksaw - almost every home has one;
building level;
spray foam gun;
builder's pencil or marker;
screwdriver or Phillips screwdriver;
construction (stationery) knife with a retractable blade;
clean rags.

Preparatory work

Before installing the window sill, it is necessary to carry out a number of preparatory work:

take measurements of the window opening to determine the size of the window sill board;
select the window sill panel;
make grooves in the wall;
clean the base of the window opening from debris;
cut the window sill to size.

Window opening measurements

Quality installed window sill determined by several parameters. Among them, an important place is occupied by the accuracy of the measurements taken and the calculation of the dimensions of the window sill based on them. In the case of a plastic slab, bringing the window sill to size is done at home.

Other types of window sills can be ordered in finished form. Therefore, errors in calculations, if they are made in a smaller direction, cannot be corrected. For larger sizes, you will have to increase the grooves and install brackets for additional support of the window sill.

The measurement is carried out in the following order:

1. The distance from the frame to the edge of the wall on both sides of the window is measured, i.e. The depth of the window opening is measured. To determine the actual width of the window sill, add 2 cm to the result obtained to go under the window structure and 4-6 cm to go beyond the wall into the room.

On many sites you can find a recommendation to extend 10 cm beyond the wall. Here only aesthetic perception window sill. In technological terms, a large protrusion prevents warm air flows from heating radiators from spreading throughout the room (air convention is violated);

2. The distance between the walls next to the window is measured (line B in the figure), and then the length of the edge of the wall at the base of the window opening if the slopes are not made at right angles (line C in the figure). To the results obtained, 2-3 cm is added on each side so that the window sill board fits into the grooves on the wall (stone and wood are hidden in the slopes by 1.5-2 cm). In addition, 3-5 cm are added to the eyes.

Selecting a window sill panel

The plastic window sill has standard dimensions:

length 6 m;
width from 20 cm to 100 cm, with increments of increasing size by 5 cm to a width of 60 cm and 10 cm further.

Therefore, choosing the required size is not difficult - you can always cut off the excess. More difficulties arise when choosing a specific plastic model. Here you need to follow the advice of experts.

Buy a window sill board with an allowance in size.
Don't skimp on materials - cheap plastic has low strength (fragile) and fades in the sun.
Take a PVC panel of the same color as the window, unless design solution in the interior, where the window sill can be under natural materials.
The stiffening ribs should not be positioned vertically, but at an angle, in the form of saw teeth - the panel has higher strength.
Scratches and abrasions are less noticeable on white.
The distance between the stiffeners should not exceed 35 mm.
Study the certificate. It is necessary to pay attention to the percentage of polyvinyl chloride (the norm is about 60%) and chalk - no more than 5%.

Grooves are knocked out

The window sill board should extend 2-3 cm inside the slope. To do this, at the level of the base of the window opening, a groove measuring 50x50 mm is knocked out in the wall with a puncher. If you don’t have such a tool at hand, you can select a recess in the brick using a hammer and chisel.

If the slope is concrete, use a grinder with a special cutting wheel to make 2-3 cuts in the place where the groove will be. To avoid accidentally damaging the frame, a spatula is pressed tightly against it. It is easier to knock out cut concrete than monolithic one.

Preparing the base of the wall

The polyurethane foam must come into direct contact with wall material. Therefore, the base of the opening is cleared of construction waste and foam that protruded excessively when foaming the space between the frame and the walls. The foam is also cut out from under the bottom window profile to a depth of 2-3 cm for partial pinching of the window sill canvas by the window structure.

If the distance between the lower plane of the installed window sill and the base of the wall is less than 1 cm, a recess up to 70 mm wide and 20-30 mm deep is cut into the wall to form a foam seam on which the plastic panel will lie.

Preparing the plastic panel

Plastic window sill for sale rectangular shape. You need to insert a panel in the shape of the letter “T” with a wide leg (often placed in the shape of a rectangle or trapezoid). Therefore, the dimensions of the real window sill are transferred to the plastic and the cutting lines are drawn with a construction pencil. The required shape is cut along the lines.

Important: when installing windows, very often they shift along the vertical axis, when the distance from the edge of the wall to the frame is different on different slopes. In these cases, the rear side of the panel is cut obliquely so that a parallel is maintained between the wall and the window sill protrusion.

Window sill installation

Instructions on how to properly install a window sill on plastic windows are simple and easy to understand for beginners in the construction business. Let's look at all the operations step by step.

Step 1. WITH bottom side the window sill, as well as from the sides at a distance of 3-4 cm, the protective film is removed.

Step 2. The window sill is tried on and inserted into the place of permanent fixation. If an undercut area is discovered, the inaccuracy is corrected.

Step 3. A vapor barrier tape is attached under the frame.

Step 4. Pre-purchased wedges (bars) are installed. There are several important points to consider here:

The minimum width of the bars is 5.0 cm;
The length of the wedge should be less than the width of the panel, but no more than 10.0 cm, and the block should not protrude beyond the wall;
The ideal distance between the bars is 40.0-50.0 cm. This rule does not apply to narrow window openings of Soviet-built houses - at least three bars must be placed under the window sill for one window;
Under the wedges, the wall surface is leveled or plaster mortar or putty;
Using a level, all supports are brought into one plane. In addition, the length of the block is aligned horizontally.

Step 5. A protective film 3-4 cm wide is removed from the surface of the plastic on the window side. Plugs are placed at the ends.

Step 6. The final test fitting is carried out, during which the following tasks are solved:

a tight fit of the window sill panel to the frame is ensured - if necessary, the bars are additionally adjusted;
the slope of the window sill board towards the room is ensured by 2-3 mm for every 20 cm of window sill width - necessary for condensate drainage.

Step 7 The installation seam is foamed onto the base of the opening.

Step 8 After the foam reaches the “touch-dry” state, a window sill is installed. Using a rubber hammer, he sits in a permanent place.

Step 9 The level once again checks the plane of the window sill. If necessary, adjustments are made - another gasket is installed (fourth) or the existing ones are adjusted.

Step 10 A small weight is placed on the window sill board closer to the room - in this way, a tight fit of the window sill to the frame is achieved due to the expanding foam.

Step 11 After half an hour, an additional 10 kg of weight is placed on the windowsill, after which the remaining space can be foamed.

Step 12 The grooves are sealed with putty, after which the slopes can be sheathed with plastic panels.

Step 13 The joints of the window sill with the slope panels and the frame are sealed plastic sealant- silicone.

Step 14 After a day, the load is removed and the protective film is removed.

Now you can install the plugs at the ends and remove the protective film.

For information: on balconies and loggias, window sills are installed using the same algorithm.

The nuances of installing window sills from other materials

How to attach a window sill to a plastic window made of other materials? Window sill boards made of natural and artificial stone must be attached with glue. To do this, the base of the window opening is leveled cement-sand mortar. The ends of the stone are protected with felt.

A wooden window sill can be installed in various ways:

by pressing method - under the frame;
on wedges;
on glue;
on the brackets.

Conclusion

On sale you can choose a window sill for every taste and at any price:

made of natural stone (granite, marble);
artificial stone (acrylic, quartz agglomerate);
wood;
Chipboard, MDF;
plastic.

Installation instructions are simple. Provides the following types works:

measurements of the window opening are taken;
a panel is purchased and then cut to size;
grooves are knocked out in the wall;
the base is cleared of debris;
wedges are placed;
the plane of the window sill is installed in accordance with the requirements of technological regulations;
the window sill board is secured with mounting foam;
the grooves are sealed with putty, the slopes are sewn up with plastic panels.

For balcony windows installation of window sills is carried out according to the same scheme.

Tsugunov Anton Valerievich

Reading time: 2 minutes

The installation of the window sill usually completes the installation of the window. This element cannot be excluded from the window design. Firstly, it is a decorative element. Agree that window hole without a window sill it will look, to put it mildly, ridiculous. Secondly, this additional element also performs a protective function, taking on temperature changes and mechanical loads. Replacing old windows with more practical PVC structures is carried out by specialists. Typically, the range of services provided includes installation of window sills and. However, installing a plastic window sill with your own hands is not particularly difficult, so you can save money by doing the installation yourself. Let us immediately clarify that this procedure is carried out only after replacing the window. Let's consider all stages of installation work, including determining dimensions.

Preparation

The installation procedure begins with dismantling old design. This is very important nuance: PVC structures are never installed with wooden frames. If you ordered window installation from a specialized company, then this stage will be performed by the installers. Specialists dismantle old frames and... All you have to do is prepare the window opening. To do this, you need to clean the bottom window opening from the remains of construction waste, remove the remaining plaster and make grooves in the side walls. This is done to securely fix the plastic structure.

Please note that it is not always advisable to make grooves. Typically, this procedure is performed if the width of the panel extends beyond the window opening.

Then you need to foam all the cracks that remain after installing the window, level the lower part of the window opening and prime the surface. These precautions will help eliminate drafts and, accordingly, maintain heat in the apartment.

Measurements

It is not possible to purchase a product of suitable sizes: window sills are adjusted individually according to the parameters of the window opening. That's why plastic panel you'll have to trim it yourself. It is not difficult to adjust the window sill to the size of the window with your own hands: plastic can be easily processed and cut with any sharp tool. At this stage, it is important to correctly calculate the length and width of the structure.

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First, measure the width of the window opening. To the resulting figure you need to add 1.5-2 centimeters on each side. Usually the edges are retracted into grooves or covered with slopes. The width of the window sill depends on your desire. If the structure will not extend beyond the wall, then you need to add 2 centimeters to the width of the window opening: this part will go under the window. If you are planning to install a protruding structure, then ideally the window sill should reach the middle of the radiator.

Close heating system highly not recommended. Warm air will not rise to the windows, as a result, condensation and ice will form in winter. Accordingly, the lifespan of PVC windows will be significantly reduced. If you still decide to close the batteries completely, you need to make ventilation holes in the window sill.

The thickness of the window sill does not play a special role: this element does not bear high mechanical loads. The exception is situations when PVC panel installed on the entire wall, combining two windows. In this case, the thickness of the window sill should have a maximum value of 22 millimeters. Don't forget to equip the window sill with end caps.

Installation process

How to install a window sill correctly? It is enough to approach the installation procedure responsibly and follow the instructions given. Here is a step-by-step installation diagram:

The dimensions of the structure have already been adjusted to the parameters of the window opening. To ensure that the calculations are correct, the window sill is installed in place. If the panel does not fit, you need to remove the element and clean the end and front sides with a knife.
Please note that window sills are not laid on a concrete or brick base. Therefore, panel installation involves the use of wooden or plastic supports. The recommended width of such substrates is at least 50 millimeters, the length is less than the width of the panel. The thickness of the supports is selected individually, the main thing is that the window sill fits clearly into the groove under the window. It is worth noting that the supports are installed only on a leveled surface to prevent distortions in the structure. The distance between such substrates is 40-50 centimeters. You can check the correct installation of the supports by cutting the window sill: the piece should fit tightly into the groove between the support and the bottom of the window.

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The voids between the supports are usually eliminated. To do this, use polyurethane foam or mineral wool. In the second case, the substrates must adhere firmly to the base of the window opening, so the supports are fixed with silicone glue. Before using this material, it is recommended to degrease the surface.
Let's start installation PVC structures. Before starting work, you must remove protective film from the window side and install end caps. Then we install the window sill in place.

Please note that the element should fit into the groove quite tightly, but there is no need to apply excessive force. You need to leave a small gap (about 5 millimeters) on the sides of the structure; this is a precautionary measure that will help prevent deformation of the window sill. To do this, install substrates of appropriate thickness on the sides. These beacons then need to be removed and the gaps sealed with sealant.

Align the panel in a horizontal plane with light tapping. We check the position of the window sill by level.

Installation is almost complete. Now you need to foam the free space under the window. Please note that the polyurethane foam increases in volume as it dries, so you need to install special spacers. If this is not done, the structure will become distorted and subsequently replaced. Spacers are made of wooden blocks, one is installed in the center and two on the sides. The clamps are removed after the foam has completely hardened (about a day), the excess of which is removed with a knife.

Then the slopes are installed and the remaining gaps are sealed. A sealant is usually used for this. The edges of the window sill adjacent to the walls are covered with mounting tape.
After completing all installation work, remove the protective film from the window sill.

Don't repeat the mistakes

Remember: violation of installation technology will invariably entail replacement of the window sill.

Therefore, we will give a few useful tips that will help avoid unpleasant consequences:

Installation is carried out immediately after replacing the window. If you first install slopes and plaster the walls, the risk of damaging the surfaces increases. Accordingly, all the work done will go down the drain.
Wide and long panels require additional fastening. This is usually done if the window sill exceeds the width of the window space by a third. Brackets are used for mounting.
Maintain the size carefully and be sure to use a building level.
For better adhesion of surfaces, the window opening must be moistened with water.
Don't use too much foam. When foaming the window sill space, it is recommended to leave small gaps.