Do the stairwells of multi storey public buildings have to be out of the roof?

Code for Fire Protection Design of Buildings for multi-storey public buildings.

There are no mandatory requirements for stairwells out of the roof. Generally, multi-storey public buildings do not require stairwells to go out of the roof.

Since there is only one staircase for each unit, the stairwell is required to be used as a second evacuation opening, but it is generally necessary to go out of the roof when there are more than six floors.

But the Code for the Design of Shop Buildings

in Article I. When the business floor of a large department store or shopping mall building is more than five floors, it is advisable to set up no less than 2 evacuation stairwells directly to the roof platform, and the refuge area of barrier-free objects on the roof platform should not be less than 50% of the construction area of the largest business floor.

If there are requirements for use, the stairwell also needs to be out of the roof, such as using a lot of roof solar energy, or there are more roof equipment, in order to facilitate installation and maintenance, the stairwell out of the roof is also needed.

Extended Information:Composition of the staircase:

1. Staircase.

The number of steps on each staircase must not exceed 18 and not less than 3.

2. Stair landing.

Stair landings are divided into floor landings and intermediate landings according to their location.

3. Railings (railings) and handrails.

The railing (handrail) is an enclosure component arranged on the airside of the staircase and the platform, which should have a certain strength and rigidity, and should be provided with a handrail for people to support in the upper part. A handrail is a continuous accessory located at the top of a railing for people to lean on up and down stairs.

4. General Column.

The large column at the beginning of the stair railing is generally one size larger than the large column.

5. a large column.

At the corner of the railing, undertake two handrails or make a large pillar with handrails at the end.

6. a pedal. The lower panel on the staircase is generally 38mm as a whole, and 30mm thick on the cement ladder.

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How the cold storage construction was done.

The number of natural floors is generally not calculated for the roof of a simple stairwell or elevator hall, and the area of the top floor is required to be no more than 1 8 of the roof area (this data is a bit vague).

Enclosed stairwell:

1. High-rise factories and Class A, B and C multi-storey factories should be equipped with closed stairwells or outdoor stairs.

2. High-rise warehouses should be equipped with closed stairwells.

3. The indoor evacuation staircase of the following public buildings shall be closed stairwell (including the enlarged closed stairwell on the first floor) or outdoor evacuation staircase.

4. Underground shops and underground buildings (rooms) with singing and dancing entertainment screening and amusement venues shall be set up with closed stairwells when the number of floors under the ground is 3 floors or more or the height difference between the ground inside the basement and the floor at the outdoor entrance and exit is less than or equal to 10m.

5. Residential units on the 12th and 18th floors shall be provided with enclosed stairwells.

The staircase roof does not count the number of floors. For example, a 32-storey building is the number of floors above ground from the ground floor to the top floor, and does not include the underground and above the main roof (stairwell roof, elevator machine room, water tank room, etc.). However, when calculating the floor area, all spaces with permanent roofs and permanent maintenance structures should be calculated.

Building height is the vertical distance from the exterior ground to the main roof.

Summary. The roof of the high-rise stairwell should be constructed in accordance with the relevant laws and regulations, and it needs to be carried out in strict accordance with the safety design requirements, including whether it is open or closed, depending on the specific situation, and each case is on a case-by-case basis.

The roof of the high-rise stairwell should be constructed in accordance with the relevant laws and regulations, and the excitement needs to be carried out in strict accordance with the safety design requirements.

Can you tell us more about that?

In architectural design, the staircase is one of the passages for people to enter and exit the building, while the staircase or inter-roof refers to the setting of an open area at the top of the stairwell. Whether or not to open the roof needs to be based on the actual situation. If the staircase is built in a basement or semi-basement, an open roof can enhance the lighting and ventilation effect, making the stairwell brighter and drier.

In the roof stairwell, it is not recommended to open the roof as this will affect the waterproofing performance of the roof. In short, when considering whether to open the stairwell out of the roof, you should consider various factors such as lighting, ventilation, and waterproofing according to the actual situation to ensure safety, comfort and beauty.

Generally, multi-storey public buildings do not require stairwells to go out of the roof.

According to the Code for Fire Protection Design of Buildings, multi-storey residential buildings require the stairwell to be used as a second evacuation opening because there is only one staircase per unit, but it is generally necessary to go out of the roof when there are more than six floors.

The standard and quality of high-rise buildings are generally higher than those of multi-storey, ordinary multi-storey houses are generally brick-concrete structures, while high-rise houses are cast-in-place reinforced concrete, the foundation is deep and strong, the walls are thick, no water seepage, and the seismic performance is better than that of multi-storey houses. Generally, if you live on a higher floor, you will have a wider view, better air quality and low noise.

The fire protection code for building design stipulates that the stairwell of the residential building should lead to the roof, and the door or window leading to the flat roof should be opened outward. "Yi" means to do the best, and it is not a mistake not to do it.

So it's okay not to remodel it into a stairwell out of the roof. If it is changed, it will indeed affect the previous load, and it is very troublesome to plant reinforcement and so on. In addition, you must make sure that your building does not exceed 24m

Generally, the evacuation stairs of multi-storey buildings do not lead to the roof, but if you have an elevator room or water tank on the roof of the building, it is best to have a staircase leading to the roof.

Now the new design code, which is required by fire protection, is enforced.

First, the first class of high-rise according to the regulations, need to be equipped with smoke-proof stairwells, that is to say, to do the front room. The main situation of setting up the Frontrooms:

Smoke-proof stairwells shall be provided for Class I buildings and Class II buildings with a building height of more than 32 m except for unit-type and corridor-type houses, as well as tower dwellings.

There should be a front room, balcony or alcove at the entrance of the stairwell. -- Code for Fire Protection Design of High-rise Civil Buildings

When natural lighting and natural ventilation are not possible, the stairwell shall be equipped with smoke-proof or smoke exhaust facilities in accordance with the provisions of Chapter 9 of this Code, and fire emergency lighting facilities shall be set up in accordance with the provisions of Chapter 11 of this Code.

At the entrance of the stairwell, smoke-proof front rooms, open balconies or alcoves should be installed. The smoke-proof front room can be shared with the front room of the fire elevator hall. -- Code for Fire Protection in Building Design

2. Explanation of terms:

The front room, which is the transitional space before entering the fire elevator, smoke-proof stairwell, or enclosed stairwell without natural ventilation. A small room located at the exit of the fire elevator for personnel passage and evacuation, or a small room located at the entrance of the smoke-proof stairwell to prevent fire smoke from entering the smoke-proof stairwell. In the Code for Fire Protection Design of Buildings and the Code for Fire Protection Design of High-rise Civil Buildings, strict regulations are made on the smoke prevention and exhaust problems of the front room of the fire elevator, the front room of the smoke-proof staircase, and the shared front room of the fire elevator and the smoke-proof stairwell, as well as the size of the area.

3. Illustration:

The stairwell is equipped with a front room (pressurized air supply in the front room) at the entrance and exit of each floor to prevent smoke from entering the stairwell, so as to ensure the safe evacuation of personnel.

The stairwell is an outdoor safe space outside the roof, so there is no requirement to have a front room.

The stairwell is on the roof level, so there is no need for the front room.