Concrete, plastic, wooden and tiled window sills are installed the same way. The only difference is their weight. Initially, you need to vymeryat and cut the required length of the sill, which should fit the size of the opening window. If the slopes are already or you have decided to leave the old, they must be trimmed horizontally so that the sill is recessed in the slope of a few centimeters.
During the pruning should be remembered that the slopes need to do some deployed on, in other words, they must be made with respect to the surface of the window at an angle that is greater than ninety degrees. That is why the window sill near the window to be smaller than the other.
Once the window sill was trimmed and fitted to fit the window, he put to the window and put up with wooden wedges, spacers. In this case, the wedges do not extend beyond the walls. The window sill is exposed at once with a slight slope towards the room is used for this level. After setting, the wedges are fixed with a plaster solution - obtained beacons. Make beacons to the window sill has been installed on your desired level.
Thereafter, the surface of the above solution was placed beacons whose thickness must not be less than 0.5 centimeters. The solution is made of plaster with lime, sand and cement, putty and starting t. D. The solution must be chosen depending on the material from which is made the sill (made of concrete, plastic, wood, marble, granite), and installation position (to be room dry, moist).
In humid areas and on the facades of buildings is best to use cement mortars with special additives. It can be used any kind of solution in a dry room. Sill need drown in solution until beacons. Excess solution was removed with a spatula.
Plastic and wooden window sill can be further screwed through the window box using self-tapping screws for wood. Screws must be screwed to the front and to enter into the window sill at least three - five centimeters. The lower portion of the sill is protected from moisture by using water-repellent compositions which are applied to the surface of the sill.
Places where the sill is adjacent to the frame and slopes, can be repaired with acrylic. When the acrylic completely dry, it becomes rubber thereby will prevent the formation of cracks across the junction area. Additionally, acrylic sealant is remarkable, it is not afraid of water and amenable to staining by any kind of paint. If you do not want to acrylics it was white, you can always repaint it in any, the color you like.
It often happens that the sill has no rigid base (for example, when the battery is strongly comes into the niche, and the sill largely up in the air). In this case, the sill stiffened by wooden or metal poles, which make under the windowsill. Such supports are laid before the installation of the window sill. Also, the sill may be supported on wooden or metal corners, bars around the perimeter niche or the entire length of a few, enshrined in the walls, smooth wooden or metal supports.