If you build a 4 story building in the countryside, can you do a 3 meter deep middle balcony?

Guess when you say three meters deep, you probably mean three meters wide. If it is made into a cantilevered balcony, the length of this protrusion is too long. It is too thick to do a panel balcony board, and you have to do a beam type to do it, and the height of the beam should not be less than 300 mm.

The most important thing is to do a good job in the anti-overturning measures of the beam. The beam should extend into the load-bearing wall for a sufficient length, and the beam should have enough load on the top of the part that extends into the beam.

If you don't go to the scene, you don't know the structural layout of your room and the load of the balcony, it may not be reliable to use only the floor slab and the non-load-bearing wall to resist overturning, and use the load-bearing wall and the load of the upper floor slab to balance the overturning force of the balcony.

In addition, the bottom width of the foundation under the wall with a balcony should also be accounted for separately.

In short, picking a 3-meter balcony is not a good plan, the structural layout is complex, the calculation procedures are many and troublesome, the cost is unreasonably increased, the construction requirements are strict, which step must be careful, otherwise there is a risk of accidents. Therefore, the design and construction should be done by experienced professional design and construction personnel.

It is recommended to change to a scheme of arranging two columns below the end of the balcony to do support, which saves trouble and money, why not!