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Basic concept of casement window

Time : 2022-07-10 Hits : 3

A style of windows in folk houses. The opening and closing of the window sash moves along a certain horizontal direction, so it is called "casement window".

The casement window is divided into push-pull type and upper suspension type. Its advantages are large opening area, good ventilation, good sealing, excellent sound insulation, heat preservation and impermeability. The inner opening is convenient for cleaning windows; The open type does not occupy space when it is opened. The disadvantage is that the window width is small and the field of vision is not wide.

The opening of the external window takes up a space outside the wall, which is easy to be damaged when the wind blows; And opening windows inside takes up part of the indoor space. It is inconvenient to use screen windows. It is inconvenient to use screen windows and curtains when opening windows. If the quality is not up to standard, it may also leak rain.

Basic concept of casement window

The hinge is installed on one side of the window sash and connected with the window frame. According to the outward or inward opening, this kind of window is divided into external casement window and internal casement window. This kind of window is characterized by simple structure, flexible opening, easy cleaning, and good sealing performance when closed. It is the most widely used type of window in civil buildings.

A style of windows in folk houses. The opening and closing of the window sash moves along a certain horizontal direction, so it is called "casement window". There are two kinds of windows: flip windows and sliding windows. There are many single windows, which turn up when opened, and are supported and fixed by the iron bar on the window frame; Some turn down and open it to a certain extent to be fixed by the chain on the window frame. The sliding window has many double leaves. When opening and closing, the window sash slides horizontally along the slot of the window frame, or slides up and down. The front windows of houses in northern quadrangles are mostly turned up, with wooden mullions inlaid in the center of the window, pasted with white paper, and turned outward when opening the window. Windows are also common in attics and suspended buildings in southern houses.

Opening mode

Sliding window

The advantages are simple and beautiful, large window width, large glass block, wide vision, high daylighting rate, convenient glass cleaning, flexible use, safe and reliable, long service life, opening in one plane, less space occupation, convenient installation of screen windows, etc. The most widely used is sliding window. The disadvantage is that the two windows cannot be opened at the same time, but only half can be opened at most, and the ventilation is relatively poor; Sometimes the tightness is also slightly poor.

Overhanging type

This is a kind of aluminum alloy and plastic steel window that appeared later. It is a new form developed on the basis of casement windows. It has two ways of opening, which can be opened horizontally or pushed from the bottom. When the casement window is closed, pushing the lower part of the window outward can open a gap of about 10 cm, that is, the window can be opened a little from below, and the open part is suspended in the air, which is connected and fixed with the window frame through hinges, etc., so it is called upper hanging type. Its advantage is that it can not only ventilate, but also ensure safety. Because there are hinges, the window can only open a gap of ten centimeters, and can't reach in from the outside. It is especially suitable for use when there is no one at home. This function is not only limited to the casement window, but also the sliding window can be hung up.

Difference comparison

Comparison between sliding window and casement window


The casement window is better than the sliding window in performance, but the sliding window is better than the casement window in processing and operation. For this reason, casement windows are widely used in urban commercial and residential buildings, office buildings, high-end residential buildings, villas and other medium and high-end buildings; Sliding windows are widely used in medium and low-grade buildings such as industrial plants and rural houses. Aluminum alloy doors and windows are classified according to their opening methods. The more popular and practical window types in the market are sliding windows and casement windows. Casement window refers to the door and window that the hinge (hinge) is installed on the side of the door and window and opens inward or outward; Sliding doors and windows mainly refer to doors and windows whose sashes are pushed and pulled vertically left and right along the horizontal direction. The push-pull and flat opening are compared under the condition of using the same glass and accessories. Each has its own advantages. The following will discuss their respective characteristics in detail in terms of the appearance, performance, price and use function of doors and windows.

Specific appearance

The difference between casement windows and sliding windows in appearance mainly lies in the collocation with the overall style of the building. Because of the flexibility of its division, casement windows can make any line facade effect, and for large division French windows, the opening fan only accounts for a small part of the whole window, so it is more suitable for high-end real estate with strict requirements for the overall effect of the building, especially in line with the large division, spacious and bright A building with good permeability and smooth appearance. The sliding window can only be pushed and pulled horizontally, so it is difficult to match with the fixed glass with large divisions. Generally, it is more suitable for business plants or rural family buildings with clear horizontal and vertical lines.

Specific performance

In terms of the three properties (wind pressure resistance, water tightness and air tightness) of doors and windows, casement windows are generally better than sliding windows. The wind pressure resistance of doors and windows depends on the resistance moment of the main load-bearing members of doors and windows. The larger the section of the profile is, the greater the resistance moment is, but it is not completely proportional. Generally, the cross-section of casement windows is small, but their main stress bars are usually made of splicing materials or medium vertical materials. These main stress bars will be strengthened in the design process, so their wind pressure resistance performance is good. The cross-section of sliding window profile is generally large, so its wind pressure resistance performance should be relatively good, but as long as a little in-depth stress analysis shows that its main stress bar is often made of medium fan material, and its upper and lower stiles only rely on pulleys to bear the horizontal wind load, so the wind pressure resistance performance is generally not ideal. The water tightness of doors and windows depends on the sealing effect of the opening part, and the casement windows are generally sealed with rubber strips. In terms of air tightness, two-point locks or heaven and earth locks are used for locking and sealing in the opening parts of casement windows in the market. Therefore, the casement window is generally better than the sliding window in terms of three properties. This is why most high-end commercial and residential buildings choose to use casement windows.

Warmer than

In terms of thermal insulation performance, sealant strips are generally used for sealing flat windows in the market, while wool strips are generally used for sealing sliding windows. The sealing effect of rubber strips is generally better than wool strips. The two-point lock or heaven and earth lock is used to lock and seal the opening part of the casement window, which has a better sealing effect. The sliding window is generally locked with hook lock or latch, and its sealing effect is not ideal.

Specific price

In terms of price, there is little difference between casement windows and sliding windows of the same grade. Casement windows are slightly higher than sliding windows. The price of ordinary casement aluminum alloy window is 200 ~

350 yuan / square meter, and the price of medium and high-end windows is more than 500 to 1000 yuan / square meter. Sliding doors and windows are generally 300 yuan / square meter.

Specific process

In terms of processing and manufacturing, the sliding window is generally simple in structure and has no special requirements for equipment, so it is processed and manufactured in a small workshop of a small electric saw; Because the casement window is connected by thick aluminum alloy corner pieces at 45 degrees, it needs a good "corner striking machine" and "double head cutting saw king" to make a good aluminum alloy casement window,.

To sum up, casement windows are better than sliding windows in performance, and casement windows are widely used.

Casement features

Air permeability

Because the inverted position is another way to open the casement window, which makes the room circulate naturally with the air of nature, and the indoor air is fresh. At the same time, it eliminates the possibility of rainwater entering the room. The fresh air undoubtedly creates a comfortable living environment for people.


The linkage hardware arranged around the window sash and various functions of the handle operated indoors are fixed on the window frame around the window sash when it is closed, so the safety and anti-theft performance are excellent.

Easy to clean windows

The operation is simple, and the window sash can be turned from the outside to the inside. It makes it convenient and safe to clean the outer surface of the window. 4. Practicality: it avoids the occupation of indoor space when the inner window is opened, and it is inconvenient to hang curtains and install lifting clothes hanging rods.

Good sealing and insulation performance

Through multi-point locking around the window sash, the sealing and thermal insulation effect of doors and windows are ensured.

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