Roofs are parts of the building that are constructed in various ways with respect to structural strength using gonacon materials. Previous builders have introduced roof types, and now we are going to explain one of these types as chromite roof. This roof is similar to a conventional block joist, but the joists used are different. Join us for an introduction to this ceiling.
Chromite Ceiling
Chromite roof is a type of block joist that uses an open metal joist to make it. The roof is made of steel structures and is a new type of roof that is high strength and integrated. This roof has more advantages than other roofs, so it is used in various structures. Using chromite joists, multiple roofs can be concreted at the same time, making it economically cost-effective. Chromite joists are in a standing position and do not need to be lit under the roof. These joists are designed so that they can withstand the weight of the concrete and the molds, so after the concrete is cast, the steel joists are integrated with concrete and bear the loads that go into the roof. . In general, these joists have the ability to withstand the load before and after concrete and can withstand all the loads of living and dead.

The steel joists used to build the chromite ceiling must be inspected before they can be installed and confirmed to be flawless. If the joists are long, you should cut them and reinforce them after they are placed. For the construction of concrete structures, the underside of the joists must be mounted on a metal or wooden frame. When concrete is poured into steel joists, it penetrates into the spaces between the joists, thereby increasing the shear strength of the joists. Filling the joists with concrete will reduce the vibration of the roof. When concrete is used, concrete vibration operations must be carried out to penetrate the concrete into all parts of the joinery and fill in the voids.

The blocks used in chromite roofing are clay block, cement block and polystyrene block. The wall of the cement blocks selected for this ceiling should be 1.5 cm and their seating on the joist shall be 2.5 cm. Clay blocks should also have a 2.5 cm thick wall without cracking. If polystyrene blocks are used in the application of this type of roofing, the surface of the lower blocks should be covered with Robits and lined with plaster mortar of 1.5 cm thick. Polystyrene blocks are types of blocks made of polymer materials that are less weighty than other blocks and their use plays an important role in reducing costs and project execution time. Chinese block This ceiling is made after the molding of pop-ups and covers. Designer should have the necessary skills to arrange the blocks and trim them so that the spaces are as close as possible. Sloping blocks can also be used to slice or cut them to the desired size.

If the chromite roofs are well-executed, they will have unique advantages over other roofs, such as high cohesion, acceptable thickness, no need for false ceilings and high running speed. Other benefits of this type of roof are as follows:
Benefits of Chromite Ceiling
High execution speed and ease of operation
Execution of this roof is faster than that of joists. After the concreting step, the construction operation can continue and there will be no obstacle to light loading.
Deformation in order to achieve ultimate resistance
The chromite ceiling system achieves ultimate resistance after many deformations and breaks between the joists and the concrete. The behavior of this type of roof and its gradual release ensures its safety and strength.
Reduce concrete stress
Chromite joists are said to be standing upright so they can withstand the weight of wet concrete and the stress is very low.
Weight loss ceiling
Compared to conventional block joist roofs, the concrete consumption in the chromite roof is lower, thus making the roof structure lighter in weight.
No need for candles
Chromitic joinery itself can withstand the weight of wet concrete, block and other performance factors before and after concrete sealing. Because of this high strength and durability, there is no need for candlesticks in any of the operations.

Integration of skeleton and roof
Chromite joists are welded to the skeleton and once the concrete is taken over, the roof and skeleton will be tightened.
Supervision of project implementation
Design and implementation of chromite ceilings is carried out with the supervision and guidance of expert personnel to ensure work safety and avoid any defects.
Run multiple ceilings simultaneously
Applying chromite roofing to buildings with a high or low floor number will save money. Due to the need for candles, concrete can be applied to several roofs simultaneously.
Execution of roof with special openings and cargo
In this type of roof system it is possible to run a roof with heavy loads and high openings. Using a chromed roof, the roof span can be up to 1.5 meters with a load-carrying capacity of 3 tons.

One of the important factors in the construction industry is the elimination of traditional methods and speeding up the implementation of construction projects. One of the elements that accelerates construction is the roof. The use of new roofing techniques will shorten project completion time. Today, most engineers and builders tend to use new methods of construction. Steel deck ceiling is one of the lightest roofs in the construction of structures that is widely used today.

Deck ceiling or metal deck
The steel deck or metal deck ceiling is operated by trapezoidal galvanized sheets. This type of roof requires no molding and the steel sheets that rely on the beams play the role of mold. Ceiling molding is basically one of the problems with ceiling execution that delays the process of ceiling execution. Using a steel deck ceiling solves this problem and shortens the ceiling’s running time. Compared to block joist roofs, this type of roof has a lighter weight and is faster to execute.

The steel deck roof consists of the following components:

Galvanized sheets
Galvanized sheets are trapezoidal in shape, with thicknesses of 0.5 to 2.5 mm. These sheets are trapezoidally shaped in a variety of designs by the cold rolling method. Rigging these steel sheets is essential because these tiles create the necessary bonding between concrete and steel sheets.

Flushing
Flushings are made of galvanized sheet with a thickness of 2.5 mm. The flushing is mounted on the edge of the steel deck or metal deck and acts as a mold before the concrete is tightened and afterwards it tightens the concrete and makes the roof more beautiful after concrete.

stud
Studs play the role of cutters and are the interface between the galvanized sheet and the concrete. They are attached to structural beams by arc welding.

Reinforcement
At the steel deck roof, a rebar grid is used to prevent concrete cracking. Rebar mesh is often used instead of reinforcement to increase the speed of roof execution.

Concrete
After connecting the bars, the concrete work begins and the final leveling operation begins.

Advantages of steel deck ceiling
The use of steel deck roofs has a great impact on the style of the structure.
The weight of this type of roof is very light and it is easy to carry and store galvanized sheets.
Running a steel deck roof is inexpensive and affordable.
When executing this type of molding ceiling, side beams and tensile bars are removed and no need to use them.
Metal deck ceilings are a good replacement for traditional block joists.
This type of roof can be roofed and concreted in all floors at the same time, which shortens the time of construction project execution and reduces its cost.