The amount of sand needed for a roof slab depends on the thickness of the slab. On average, for a 4-inch thickness, you might need approximately 6,500 kilograms (6.5 metric tons) of sand for every 1000 square feet.

Hi guys in this article we know about sand required for 1000 square feet slab. RCC roof slab casting process is generally based on civil engineering discipline & building construction. Quantity of sand required in RCC roof casting process different grade of concrete like M20,m25 and so more—.

M20 grade of concrete is mixture of cement sand and aggregate with water have compressive strength 20 N/mm2 and M20 grade M stands for mix and numerical figure 20 is stand for compressive strength of concrete curing time of 28 days. in this topic topic know about how much sand required for m20 concrete.

**Sand required for 1000 sq ft roof slab of m20 concrete depends on many factors like:-**

**1) Thickness of RCC slab**:- thickness of RCC roof slab is ranging between 4 inch to 6 inch. Thickness of RCC slab require more quantity of sand, ovisouly 6 inch thick RCC slab require more quantity of send than 4 inch thick.

2) **Cement sand and aggregate ratio** for different grade of concrete which are used in roof casting process.

Ratio of cement sand and aggregate in M20 grade of concrete is 1:1.5:3 in which 1 part is cement, 1.5 part is sand and 3 part is aggregate.

**Sand required for 1000 sq ft roof slab**

There are various steps of procedure to calculate sand quantity required for 1000 square feet RCC roof slab

**Sand required for 1000 sq ft roof slab 4 inch thick**

● step 1 :- suppose we have given 1000 sq ft area of rcc roof slab and there thickness is 4 inch which is equal to 0.334 feet.

● step 2 :- calculate wet volume of concrete by multiplying area and thickness of slab = 1000 sq ft × 0.334 ft = 334 cu ft, hance wet volume of concrete is equal to 334 cu ft.

● step 3 :- we know that dry volume of concrete is actual ingredients which are required so we have to convert wet volume of concrete in dry volume.

For the conversion of wet volume to dry volume we will multiply 1.54 into wet volume.

Why we multiply 1.54 in wet volume? Because when dry ingredient of concrete cement, sand and aggregate is mix with water then there volume is decrease by 54% due to evaporation of voids present in mixture, hance dry volume of concrete increased by 50%

Dry volume of concrete is equal to = 334 cu ft ×1.54 = 515 cu ft, and we know that dry volume of concrete are used to find out sand quantity required for 1000 square feet RCC roof slab.

● step 4:- mix ratio in M20 grade of concrete is 1:1.5:3 in which total proportion of sand quantity is equal to 1.5/5.5.

● step 5:- now quantity of sand required for roof slab is calculated as follows = 1.5/5.5 × 515 cu ft = 141 cu ft, and we know that one CFT sand weight is 46 kg and converting into kg we will multiply 46 into 141 CFT = 141×46= 6486 kgs = 6.486 MT

● **Ans. :-** 141 cuft (6486 kgs) sand quantity required for 1000 square feet roof slab of 4 inch thick.

**Sand required for 1000 sq ft roof slab 5 inch thick**

● step 1 :- suppose we have given 1000 sq ft area of rcc roof slab and there thickness is 5 inch which is equal to 0.417 feet.

● step 2 :- calculate wet volume of concrete by multiplying area and thickness of slab = 1000 sq ft × 0.417 ft = 417 cu ft, hance wet volume of concrete is equal to 417 cu ft.

● step 3 :- we know that dry volume of concrete is actual ingredients which are required so we have to convert wet volume of concrete in dry volume.

For the conversion of wet volume to dry volume we will multiply 1.54 into wet volume.

Dry volume of concrete is equal to = 417 cu ft ×1.54 = 642 cu ft, and we know that dry volume of concrete are used to find out sand quantity required for 1000 square feet RCC roof slab.

● step 4:- mix ratio in M20 grade of concrete is 1:1.5:3 in which total proportion of sand quantity is equal to 1.5/5.5.

● step 5:- now quantity of sand required for roof slab is calculated as follows = 1.5/5.5 ×642 cu ft = 175 cu ft, and we know that one CFT sand weight is 46 kg and converting into kg we will multiply 46 into 175 CFT = 175×46= 8054 kgs = 8.054 MT

● **Ans. :-** 175 cuft (8054 kgs) sand quantity required for 1000 square feet roof slab of 5 inch thick.

**Sand required for 1000 sq ft roof slab 6 inch thick**

● step 1 :- suppose we have given 1000 sq ft area of rcc roof slab and there thickness is 6 inch which is equal to 0.50 feet.

● step 2 :- calculate wet volume of concrete by multiplying area and thickness of slab = 1000 sq ft × 0.50 ft = 500 cu ft, hance wet volume of concrete is equal to 500 cu ft.

● step 3 :- we know that dry volume of concrete is actual ingredients which are required so we have to convert wet volume of concrete in dry volume.

For the conversion of wet volume to dry volume we will multiply 1.54 into wet volume.

Dry volume of concrete is equal to = 500 cu ft ×1.54 = 770 cu ft, and we know that dry volume of concrete are used to find out sand quantity required for 1000 square feet RCC roof slab.

● step 4:- mix ratio in M20 grade of concrete is 1:1.5:3 in which total proportion of sand quantity is equal to 1.5/5.5.

● step 5:- now quantity of sand required for roof slab is calculated as follows = 1.5/5.5 ×770 cu ft = 210 cu ft, and we know that one CFT sand weight is 46 kg and converting into kg we will multiply 46 into 210 CFT = 210×46= 9660 kgs = 9.660 MT

● **Ans. :-** 210 cuft (9660 kgs) sand quantity required for 1000 square feet roof slab of 6 inch thick.

Now question is how much sand is required for 1000 sq ft roof slab? Their answer is as follow

● **Ans. :-** 141 cu ft (6486 kgs), 175 cu ft (8054 kgs) & 210 cuft (9660 kgs) sand quantity required for 1000 square feet roof slab of 4 inch,5 inch & 6 inch thick respectively.

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**You should also visits:-**

**1)what is concrete and its types and properties**

**2) concrete quantity calculation for staircase and its formula**

**Conclusions:-**

The amount of sand needed for a roof slab depends on the thickness of the slab. On average, for a 4-inch thickness, you might need approximately 6,500 kilograms (6.5 metric tons) of sand for every 1000 square feet.