When the concrete pouring of the roof of the roof annexes is completed, the wood for the inverted bridge for the roof of the annex, air conditioning vents and skylights if any, the height of the inverted bridges is not less than 30 cm and preferably 40 cm, there are those who only make inverted bridges using blocks, and this is completely unacceptable, as the inverted bridge limits the creep of the tiles due to weathering when the tiles expand In the case of the block «inverted bridge», it cannot stop the creep of the tiles, but you can noticeably see the appearance of cracks under the inverted bridges implemented with blocks, and this has negative effects on waterproofing works, as the creep of the tiles causes the waterproofing to rupture and this results in weak points of the insulation that are a pathway for rainwater leaks.

At the same time, the columns for the upper tank canopy are implemented, and here the quality of the upper water tank is determined, either a ready-made polyethylene or fiberglass tank that is thermally insulated, or a concrete tank with the need to implement it perfectly and use the best types of waterproofing, especially from the inside using high-quality chemicals There is no doubt that the first (ready-made tank) is considered the best, as water is stored in a healthy and safe manner and easy to carry out maintenance when needed, without loading the building with additional masses (concrete tank) and what may happen from poor implementation of insulation and the appearance of leaks or leaching and so on, and this has negative effects on the safety of the building in the future, God forbid.

The overturned bridges are cleaned from the inside and make sure there are no pieces of wood and so on, then the concrete is poured for the overturned bridges and tank canopy columns, the concrete is 350 kg3 normal or as stipulated in the specifications for the project, provided that the timber for the overturned bridges and tank canopy columns is removed the next day after the pouring.

The concrete for the overturned bridges and tank canopy columns is poured on the next day.

After that, the walls of the tank canopy are built and it is recommended to use an insulated block with a minimum size of 20 cm, usually the walls of the canopy are built from three sides or according to the architectural design, the importance of building the wall facing the sun's rays at its peak should be emphasized, Riyadh residents are keen to close the western side where the sun's rays are direct on it at noon, and the sides vary according to the geographical location depending on the area where the project is located.

When the construction of the walls of the tank canopy is completed, the roof of the canopy is implemented and the architectural form must be pre-approved and fit with the general form of the project, first the wood is made and then the reinforcing steel, it is recommended that the supervising engineer attend to receive the roof of the tank canopy, after which concrete is poured for it, and the concrete is 350 kg3 ordinary, and the wood for the canopy is removed after two weeks or as directed by the site engineer, or as stipulated by the conditions and specifications of the project.

When the construction of the canopy is completed, the roof of the tank canopy is carried out.

If there is an elevator, the room for it is implemented according to a plan prepared by the entity that will supply and install the elevator, and here the elevator must be predetermined as indicated and emphasized at the beginning of this series.