Minimum thickness of RCC slab as per IS 456, hi readers today in this civil experience article we tell you all about the thickness of the minimum thickness of the concrete slab, RCC slab is a Flat surface laid over the brick wall made of a mixture of cement sand aggregate provided with reinforcement.
Minimum thickness of RCC slab as per IS 456
The minimum thickness of rcc slab thickness is totally dependent upon the types of slab such as may be slab is One way or Two way slab, the Span length of the slab, Design load which will be carried by the slab.
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| Minimum Thickness of RCC Slab |
But, the thickness of slab depends on the design load and the span. Other than that, the grade of the concrete mix design is also an important factor in the thickness of the slab.
Thickness of RCC Slab
RCC roof slab thickness is considered generally 150mm (6 inches) for residential buildings and commercial buildings with reinforcement details as per design.
Slab Thickness in mm For Various RCC Slab
Standard slab thickness in mm for various RCC Slab are given below
|
Type of Slab |
Thickness of Slab (mm) |
|
RCC roof slab for Residential Building |
125 |
|
RCC roof slab for Commercial Building |
150 |
|
For footpath |
75 |
|
For Patios |
100 |
|
For Driveway |
150 |
|
Parking area, Ground bearing concrete floor slab for residential house |
100 |
Slab Thickness in cm for various RCC Slab
Slab thickness in cm for various RCC Slab are given below
|
Type of Slab |
Thickness of Slab (cm) |
|
RCC roof slab for Residential Building |
12.5 |
|
RCC roof slab for Commercial Building |
15 |
|
For footpath |
7.5 |
|
For Patios |
10 |
|
For Driveway |
15 |
|
Parking area, Ground bearing concrete floor slab for residential house |
10 |
Standard Slab Thickness in mm for RCC various slab
|
Type of Slab |
Thickness of Slab (Inch) |
|
RCC roof slab for Residential Building |
5 |
|
RCC roof slab for Commercial Building |
6 |
|
For footpath |
3 |
|
For Patios |
4 |
|
For Driveway |
6 |
|
Parking area, Ground bearing concrete floor slab for residential house |
4 |
Minimum Thickness of Slab
The minimum thickness of the RCC slab is 4″ or 100mm, 3″ for sidewalk, 4″ for patios, 6″ for driveway, and minimum 4″ thick for parking.
It will be restricted to 4 times the nominal size of aggregate. For example, in 20mm nominal size aggregate is used in concrete, the minimum thickness is limited to 80mm according to Cl 5.3. 3 of IS 456:2000.
Here I am going to give the recommendations mentioned by codes
AS per ACI (AMERICAN CONCRETE INSTITUTE)
The minimum thickness of the RCC slab should be 5 inches.
As per IS 456-2000 (Indian Standard)
The minimum thickness of slab as per is 456 is restricted to 4 times the nominal size of aggregate.
Here we have to make an assumption, from my practical work experience, in the general case,
- Minimum concrete cover = 3/4 inch bottom, 3/4 inch top
- Dia of #4 bar = 1/2 inch main bar, 1/2 inch distribution bar
- Dia of binding wires = 0.16mm-0.6mm per layer
- Minimum thickness for concrete aggregates = 1/2 inch to 3/4 inch
- Precautionary thickness for pouring aggregates = 1 inch
Minimum thickness should not be less than 4.75 inches not forgetting the factor of safety.
Standard concrete floor slab thickness in residential construction is 4 inches, five to six inches is recommended if the concrete will receive occasional heavy loads, such as mortar homes or garbage trucks.
