The Correct Distance Between The Window Sill According To SNIP

2023 Author: Philip Bishop | [email protected]. Last modified: 2023-08-25 07:54

• Product protrusion functions
• Primary requirements
• Height calculation
• Do you need a gap?
• How to position the curtain?

The window sill plays not only an important role for the window, but can also influence the installation of batteries, it should be taken into account when choosing curtains. We will consider all the features of choosing the correct height of the window sill from the floor and from the radiator. These installation dimensions are important for the heating system.

Product protrusion functions

The ledge of the sill can be different. There are practically invisible structures that do not stand out behind the window opening, there are also wide, powerful window sills on which you can sit. The structure is needed to retain heat in the house, it can serve as an additional support, for example, for installing flower pots.

The window sill should be chosen carefully, it should be suitable for the window structure, otherwise it may fail. Replacing a part without removing the glass unit is extremely problematic.

Primary requirements

The distance from the floor to the window sill may differ depending on the type of window. However, the GOST provides for the permissible coefficient at which heat is best retained in the room, and the indicator is 0.55 W / ° С × m². This means that in order to achieve the desired effect, you need to use a plate that will have a low thermal conductivity.

An important role is played by the distance of the radiator to the window sill: in that case, there is a SNiP, the main provisions of which require:

• The window sill should have a slight inclination towards the interior of the room - at least 1˚.

  

• There must be thermal insulation between the wall and the structure.
• The installation takes into account the height from the floor. All window sills must be at the same level.
• The length of the window sill should not be more than 3 meters.
• The length is set relative to the window opening, with a difference of 4 mm.
• The distance required to retreat from the battery to the window sill should not be less than 8 cm.
• It is recommended to cut off excess parts at room temperature.

Height calculation

The distance between the radiator and the window sill must be at least 10 cm, regardless of what type of heater is used. The height of the battery itself must also be taken into account. Behind it is necessary to retreat 8 cm. The battery itself should rise 10 cm above the floor, that is, when installing the window sill from the floor according to SNIP, you will need to retreat 70-80 cm.

An important role is played by what the ledge of the window sill will be: it can significantly move away from the wall or be invisible. If there is no radiator under the window, it is not necessary to comply with any requirements, but if heating is present, the protrusion must be strictly regulated. The task of the window sill is to redirect heat flows. Without it, they will rise up, and proper heating of the room will not occur, since some of the heat will evaporate and be distributed on the ceiling.

A too wide window sill can also cause bad convection. It will not allow warm air to escape, as a result, condensation will begin to accumulate on the window, since the main air flows will go up, and some of them will get stuck under the window, heating the atmosphere. In this case, it is very important to calculate the distance from the window sill to the heating radiator, both in height and how much it is possible to make a protrusion. The problem described above can be avoided by using a slab that does not extend beyond the wall by more than 8 cm.

Tip: when calculating the dimensions, you need to take into account the level of the wall with decoration.

The best option is a solution in which no more than 10% of warm air will be retained in the window niche. To do this, the window sill should not protrude beyond the battery by more than 6 cm, but it should not be shorter than the heater.

If the design solution of the room requires the installation of non-standard wide structures, ventilation holes must be provided in them. They must be large enough for correct air circulation.

The distance between the window sill and the radiator will remain standard in this case. As for the thickness of the structure, it usually does not exceed 4 cm, but this figure is not a standard. Thinner slabs are at risk of deformation caused by warm air currents. The thicker one has a greater mass, it is more expensive. If such structures are not provided for by the design concept, it makes no sense to install them. Detailed instructions for installing the window sill.

Do you need a gap?

Some window owners believe that the sill goes deep under the window frame, but this is not the case. The distance between the window and the sill is about 10 mm. Otherwise, the structure may deform. The fact is that under the influence of warm air, the material from which the plate is made expands. A gap is left so that the structure can take the desired shape without being damaged. Visually, this technique is invisible.

How to position the curtain?

The distance of the sill curtain also plays a role. In order for the curtains to move without clinging, there were no traces left on them, and the warm air could circulate freely, the distance should be at least 5 cm.

Conclusion: it is not always possible to apply the standard distance from the floor, radiator, curtains to the windowsill, but you can find a way out by observing certain requirements.