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What Is a Floating Slab?

Floating slabs are built in two stages. The footings are poured separately in the first stage. The floating slab's centre floor is poured only after the footings have been cured. The slab is not bolted to the floor. This slab is commonly used for shallow foundations such as garages, sheds, and small home extensions.

Construction of Floating Slab

To begin, the new project requires a solid foundation to completely support the entire weight of the superstructure. As previously stated, they are more commonly used in garages, extensions of the house, or sheds that do not necessitate large foundations. 

These structures are light in weight. In comparison to conventional slab construction, floating slabs are found to be the most suitable and cost-effective. Figure 1 depicts the main construction layers of the floating slab. The following steps are involved in the construction:

The first stage of floating slab construction is clearing the land and excavating the area according to the plan. This is the initial construction preparation.

The step also includes creating a drainage channel in the sides to allow water to drain through the gravel base, as shown below. The trench is sealed with geotextile and gravels, as shown below, to remove water from the concrete slab foundation.

The slab mould is set up for the casting process. Reinforcing bars are provided in accordance with the dimensions and codes to strengthen the slab.

The slab formwork is filled with concrete. Depending on the area and workmanship, it is compacted using either my labour or a mechanical vibrator. To make the slab fully productive, proper compaction must be performed. Proper curing takes approximately 2 to 3 days. Also Read:  Density of Cement

Advantages of Floating Slabs

1. The floating slab construction can be used in site areas with low load-carrying capacity and where large sums of money are wasted on soil treatment. This system allows us to use it over loose soil or soil with varying compressibility.
2. A floating slab has the property of spreading vertical loads or stresses that come over it over a larger area.
3. When it comes to house extensions, floating slab foundations are a good option. There are times when we need to extend a building without affecting the existing foundation. This will not interfere with the existing building structures.
4. Floating slabs act as a barrier to the entry of moisture from the ground. It serves as a physical barrier between the superstructure and the ground. This prevents water and frosting seepage. The slab can be insulated against frost or moisture for this purpose. As a result, they are now widely used in cold-weather construction. Also Read: spread footing
5. The floating slabs do not necessitate the use of footer trenches. They can be poured with the help of trenching or digging, which is a cost-effective method.
6. The floating slab causes no disruption to the earth layer beneath it and has no effect on the quality.
7. Floating slabs are best suited in areas where there is a possibility of shifting in the earth layer, primarily due to high moisture content. Also Read: contour interval

Disadvantages of Floating Slabs

1. The floating slab does not make underground land available for underground access for utility connection lines.
2. It employs primitive technology.
3. The design resonance of a floating slab foundation is lower. Also Read: hip and valley roof

What is Monolithic Slab?

When used correctly and in idle situations, monolithic slab foundation can be as stable as stem wall foundation. If the ground is level and well compacted throughout the property and has a low slope, a monolithic slab foundation is appropriate.

When the conditions are not favourable for this foundation, severe problems can occur. It is not appropriate when the ground requires a large amount of fill and dirt because the concrete is prone to cracking if the ground is not well compacted. It is not preferable for houses that must be built to rise above a floodplain. The monolithic slab may crack near the perimeter walls and other important load-bearing areas in such conditions. Also Read: concrete topping

Monolithic Slab Vs Floating Slab

Monolithic slab vs Floating slab: The floating slab construction process is divided into two stages: first, the footings are poured separately, and then the floating slab is poured after the footings have dried. The monolithic slab, on the other hand, is cast in a single pour of concrete.

Floating slabs are unsuitable for house additions and garages on low-bearing soil. In comparison, monolithic slabs are appropriate for level, well-compacted ground with a low slope.

Monolithic slabs are less expensive than floating slabs because they are built faster and with fewer labourers. Also Read: Modified Proctor Test

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What Is a Crawl Space Foundation?

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