Window ! size, shape, location & number
- A window may be defined as an opening made in a wall to provide daylight vision & ventilation.
- It consists of a frame & shutter.
- The frame consists of two vertical members called jambs or posts.
- Another horizontal member connecting post at the top called ahead.
- At their base called a sill.
- A window is normally provided with two leaves or a shutter.
The selection of size, shape, location and number of windows to be provided in a room depends on the following factors
- Size of room
- Location of room
- Architectural requirement
- Utility of room
- Direction of wind
- Climatic considerations like humidity, temperature variation, etc.
Following rules may be observed while deciding the size of the window
- This total area of window opening = 10 to 20 per cent of the floor area of a room
- In hot and arid regions, opening = 15 per cent of the area of a room
- In hot and humid regions, opening = 15 to 20 per cent of an area of a room.
- In the case of a public buildings like schools, offices hospitals, etc. A minimum area of window = 20 per cent of floor area
- As adequate natural light, the area of glass panels = 8 per cent of the floor area
Some points to be kept in mind while making provision for windows in a room
- The size & number of a window should be sufficient to provide adequate light & ventilation.
- Windows should be located opposite to each other where- ever possible.
- The window sill should be placed 75 to 100 cm. above the floor level.
- Windows provided on the Northern side permit maximum daylight.
- Buildings in the humid region need special attention for adequate ventilation of the room. Some areas of the window opening in the humid area should be highest.
- The shutter of windows in the external walls should open outside. This checks the entry of rainwater inside the room.
- Windows in the external wall should be provided with Chajja projections to prevent the entry of rainwater into the room.