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Popularity plastic windows led to the fact that they began to appear in high-rise buildings immediately at the construction stage. The products are of very high quality and durable, but with all this magnificence they are not insured against accidental damage.

The defect may also be subject to plastic window sill, forcing residents to take repair measures. Damage can be repaired different ways- stick protective film, update the plastic covering or change the plane under the window to a new one. The last method is the most difficult, but even an inexperienced user can replace the window sill of a plastic window if you follow the instructions below.

Dismantling the old product

If there is a need to change the window sill, first remove the old covering. They do this in two ways:

1. They file down the polyurethane foam under the window sill, disconnect the slopes and pull the plastic plate towards you.
2. First, remove the slopes, then knock off a little plaster under the window, cut off the foam, and then pull out the board with a sharp jerk.

The first method is more humane, since the integrity is not violated wall covering. If you remove the window sill using the second method, the user will save time, but will seriously deform the walls adjacent to the window sill. Whatever dismantling method the residents choose, after the repair they will have to eliminate all the consequences of the work and restore order inside the premises.

https://www.youtube.com/watch?v=H9QsBuS77VQ Video can"t be loaded: dismantling a plastic window sill (https://www.youtube.com/watch?v=H9QsBuS77VQ)

Instructions for replacing the window sill

Before starting work, you should make sure that the length new board exceeds the width of the window opening by 15-20 cm. This is due to the fact that the edges of the slab must be recessed deep into the wall. The covering protrudes forward (inside the room) at least 5 cm.

Installing the slabs takes just a few minutes. The new PVC product is fixed using mounting adhesive, foam or cement mortar, and its inclination towards the room should be 2-3 mm. This is done so that the condensation that forms on the window does not stagnate on top of the window sill and flows down. On the sides, where the product rests on the wall, you can tighten a couple of screws to increase the stability of the structure.

The space below the window sill is sealed with polyurethane foam. The final stage of work includes:

• removing unnecessary parts polyurethane foam with a stationery knife after it has completely hardened;
• fixing plugs at the ends of the slab;
• finishing of slopes and walls when the latter are deformed during the dismantling stage.

Don’t worry if a snow-white product suddenly cracks, becomes hopelessly dirty, or no longer fits into the updated interior. Knowing how to change a window sill on a plastic window, the user will not consider these defects as serious problems.

Replacing a window sill is rarely required, but sometimes the need to perform such work arises. Removal and installation of window sill boards will be required in the following cases:

• normal wear and tear or mechanical damage surfaces;
• carrying out repairs with changes general interior premises;
• freeing up space near the window for installing new furniture or a refrigerator;
• the formation of cracks into which cold air enters from the street;
• the need to improve air convection in heating radiators.

The window sill is one of the elements of the window, structurally connected with window frame and slopes. And in order not to damage them, you need to know how to properly replace the window sill on a plastic window.

Materials and tools

To replace the window sill of a plastic window yourself, you need to purchase the following materials:

• window sill board made of solid wood, PVC, MDF, artificial or natural stone;
• two cylinders of polyurethane foam;
• corner and tape (perforated metal);
• plaster mixture;
• self-tapping screws

The tools you need to prepare are:

• pry bar or small crowbar;
• hacksaw for metal;
• sharp knife;
• hammer, chisel, perforator;
• screwdriver or Phillips screwdriver;
• rubber hammer;
• grinder with a stone circle;
• building level;
• putty knife.

Having everything at hand necessary materials and tools, you can get to work.

Preparatory stage of work

Before removing the window sill from a plastic window, you need to remove the pasted wallpaper with a knife or spatula: it is easiest to remove them, starting from the corner at the junction of adjacent strips. Then you need to dismantle window slopes, which almost always overlap the edges of the window sill.

Slopes can be panel or monolithic, i.e. made from plaster mortar. In the first case, the entire panel is completely removed, and in the second, only 15–20 cm are removed from the window sill along the entire width of the slope. Very dense plaster can be cut with a grinder and then knocked down with a hammer and chisel. You need to cut very carefully so as not to catch the window frame.

Dismantling of panel slopes is carried out in the following order:

• removal of decorative corner trims;
• removal of glue and silicone residues;
• unscrewing the screws on which the panel is fixed;
• removing the sealant in the cracks between the frame, window sill and slopes with a knife.

After this, you need to remove the panel from the grooves and remove it from the installation site.

Dismantling works

When removing a window sill with your own hands, you need to take into account that the dismantling methods will depend on the type of window sill: wooden, concrete, plastic.

Wooden boards

A solid wood window sill can be fixed in several ways:

• on metal support brackets;
• with pinching under the window frame;

• with mechanical fastening through window profile on self-tapping screws;

• on glue supported on wooden dies;
• on foamed polystyrene glue.

The easiest way to remove the window sill is from the metal brackets. To do this, simply unscrew the screws on which the board is secured and pull it out of the previously cleaned grooves.

With other installation options, the window sill board is torn off from the supporting plane using a pry bar or hammer. This should be done carefully so as not to damage the frame or split the board along the wood grain.

First you need to lift the overhanging edge of the window sill by 2-3 cm and, slightly loosening it, pull it towards you.

If there is no fastening with self-tapping screws, the board will be removed immediately, otherwise you need to find and unscrew all the screw fasteners: they can be installed under the ebb with outside windows or under sealing rubber indoors.

Monolithic concrete slab

Since dismantling a concrete window sill is accompanied by a large amount of dust and construction debris, it is necessary to cover the furniture and floors before starting work plastic film or other material to protect against possible damage and contamination.

To destroy concrete you can use:

• hammer drill or impact drill;
• grinder - for cutting concrete monolith;
• chisel and hammer - for disassembling manually.

The simplest and most accurate dismantling will be achieved with a reasonable combination of all three options.

Plastic window sill

How to replace a plastic window sill? PVC boards are removed in the same way as wooden crafts. With this dismantling, the window sill remains intact and can be reinstalled.

If the material will not be used in the future, then during installation it can be broken with a hammer, broken with a pry bar and removed in parts. However, you still need to act carefully so as not to damage the window profile.

Installing a new window sill in place

After the window sill has been removed from a plastic window indoors, it’s time to install a new one. This work is performed in 4 stages:

1. cleaning and preparing the lower part of the window opening;
2. adjusting the size and configuration of the window sill;
3. window sill installation;
4. restoration of slopes.

Before installing a new stove, check that Bottom part the window opening was completely cleared of foam residues, sealing materials, support dies and construction debris - only the material of the wall itself should be on the surface.

There must be a gap of at least 5–7 cm between the window frame and the wall to form a seam of polyurethane foam. If it is not there, then in the lower part of the opening it is necessary to knock out a groove 3–4 cm deep and up to 7 cm high. It is recommended to replace the old polystyrene foam under the frame with a new one. This will improve the insulation of the window and reduce heat loss in the future.

Adjusting the window sill board to size

New PVC sheets have rectangular shape standard length, which often does not correspond to the width of the window opening, taking into account the launch under the slopes and frame. Therefore, before installation, the window sill board is cut with a hacksaw in the transverse and longitudinal directions.

To obtain accurate profile dimensions, it is recommended to take measurements, draw a plan of the window opening and slopes indicating all required sizes. It should be taken into account that often window frames are not installed parallel to the wall, and if this is not noticeable at the window itself, then along the edge of the window sill it will become noticeable. Therefore, the longitudinal cut must be made slightly obliquely.

When calculating the size of the board, you need to remember that the depth of the grooves in the slopes must be at least 30 mm. The maximum depth can be any, but the same on both sides. The transverse cut is made at the same angle as at the slope in relation to the plane of the wall.

Window sill installation

To install a plastic window sill board, you need to proceed in the following sequence:

• Close to window frame install mounting wedges on which the window sill will rest, ensuring a slope towards the room of a couple of centimeters.
• Lay and secure vapor barrier tape along the bottom of the window.
• Apply an insulating layer of polyurethane foam to the surface and in the grooves.
• Once the foam has expanded but not yet hardened, install the window sill board in place.
• To ensure a tight fit to the foam layer, place a small load on the windowsill in the form of two three-liter jars with water poured into them.

• After 15 minutes, add foam to all places that are not completely filled.
• After another 10 minutes, install an additional weight of 8–10 kg on the surface.

Slope restoration

After installing the window sill, you can begin to restore the slopes. For panel structures you need:

• using dowels, secure the mounting rails to the wall;
• insert far edge panels at the end of the window frame;
• apply a little foam to the wall;
• press the panel against the slats and attach it with self-tapping screws;
• After 2 hours, seal the remaining cracks with sealant and glue the decorative corner.

To restore monolithic slopes, a layer is applied gypsum plaster, which is leveled using a wide spatula. For final painting of slopes it is recommended to use water-based paint. At this point, the work on replacing the window sill is considered complete.

Replacing a window sill is important element when renovating a house or replacing windows. When installing the element, it is important to ensure that everything is done hermetically: this will provide warmth in the room, eliminate fogging of windows and the formation of condensation. In addition, the window sill is an excellent stand for various objects, and if there is a heating radiator under it, then warm air it will be distributed evenly.

In what cases and how should a window sill be dismantled?

Replacing a plastic window sill may be necessary if the old element was deformed or damaged for some reason, or you are going to change the design of the room, the size of the window, and you need to install a wider or narrower element.

Changing the shape of the window sill

In any case, dismantling must be carried out carefully so as not to damage the window opening and reduce the need to repair the wall. The new one can be made from any modern material; The most popular is plastic, but structures made of wood, stone, metal, concrete or chipboard are also available. There is no fundamental difference between them; you should choose based on your own taste.

Window sill made of artificial stone

if you have Small child, do not forget for his safety.

Preparing for replacement

Before dismantling the old one, you need to select and buy a new one, from the material that you consider most suitable. Reliability, unpretentiousness, and beauty speak in favor of PVC elements. varied design, affordable price. Chipboard has almost the same properties; you can make a window sill from it yourself, but a significant disadvantage of such a material is its ability to absorb moisture and fragility.

In order to begin dismantling, you will need to stock up on the following set of tools:

• Chisel.
• Hammer.
• Polyurethane foam to secure new design and close the cracks.
• Powerful drill or hammer drill.
• Saw if you are going to use wooden or plastic elements.
• Cement.
• Silicone based sealant.

Necessary tool

Replacing a plastic window sill begins with dismantling the old element, if any. To do this you will need to remove the old cement mortar from the end side of the structure. This can be done with a hammer drill or chisel.

Removing the old window sill

After the cement is removed, the window sill is knocked down with a hammer, striking from below. When it comes off, the structure can be removed. The vacated opening is cleaned of various debris, dust, and degreased. If the unevenness is very noticeable, you need to get rid of them, otherwise the new window sill will not sit level and may crack or have an untidy appearance.

What do we have to do, ?. Read how to solve the problem if a plastic window is jammed

Removing the frame of a plastic window

Installation of a new element on a window

Having figured out how to change the window sill on a plastic window and how to remove it, you can move on to the more important part of the work - installing a new element. The task does not require complex calculations or actions, so it can also be completed independently, without complex preparation for work.

In order for the window sill to efficiently cope with its tasks, you need to install it in a sealed opening. To do this, all seams are carefully filled with foam and sealed with sealant. Cold air will not be able to get into the room from the street, which will make the room warmer. The purchased window sill is adjusted to size; to do this, you will need to cut out the floodplain from the end parts, if you need to shorten the structure: this can also be done with a saw. Plastic, like wood, lends itself well to this procedure.

Inserting a new window sill

In order to receive Exact size, can be used as a sample old window sill. Either measure it or use it large sheet paper that will serve as a stencil.

Horizontal alignment of the new window sill

There should be no gaps between the window sill and the wall, and the structure itself must be level before it is fixed. If the window sill is not made of moisture-resistant material, it is recommended to coat the end with sealant. Any window sill is attached to the opening using polyurethane foam; it also covers the cracks that may form during the dismantling process. After this, the structure must be pressed down on top with something heavy until the foam dries.

Filling voids with foam

Knowing how to replace a window sill on a plastic window , you can completely do this job yourself. The actions will not take much time and will not cause difficulties. You will receive a new window sill, for which you will not have to pay for installation.