The number of cement bags required for a 100 sq ft RCC roof slab depends on the thickness of the slab. On average, for a 4-inch thick slab, you might need around 0.08 bags (4 kilograms) per square foot. So, for a 100 sq ft slab, you could estimate needing approximately 8 cement bags.

How much cement is required for 100 sq ft rcc roof slab? and also know about how many cement bags required for 100 sq ft slab. You know that for the casting of roof slab we required nominal mix concrete like M20 mix concrete.

In M20 mix concrete M is stand for mix and numerical figure 20 is stand for characteristic of compressive strength 20N/mm2 after mixing and casting of roof slab, quantity of material in slab formation it calculated by M20 mix in which ratio of sand cement and aggregate is 1: 1.5 :3

In this article we have to calculate cement required for 100 sq ft 6 inch, 4 inch & 5 inch slab? And we know M20 mix Ratio is 1 : 1.5 : 3 in which one part is cement 1.5 parts is sand and 3 parts is aggregate

Roof slab casting is process of laying And putting concrete mix in horizontal direction and structure over brickwork. Cast of roof slab reinforcement main bar and cross bar in distributed over shuttering areas of roof slab and then we put concrete mix of M20 or m25 grade of concrete that is known as roof slab casting.

**How many cement bags required for 100 sqft roof slab?**

There are three types of thickness like 4 inch, 5 inch & 6 inch are used in roof slab casting process. So we have to calculate cement required for 100 sq ft slab 4 inch thick, 5 inch thick and 6 inch thick.

**Cement bags required for 100 sq ft slab at 6 inches thick**

How many cement bags required for 100 sq ft slab 6 inch thick

◆ Given dimensions:-

Roof slab thickness ranging between 4 inch (100mm) to 6 inch (150mm) but in this calculation we take roof slab thickness is 6 inch (150mm) which is given

Roof slab thickness = 6″ = 0.5′

Area of slab = 100 sq ft

Mix ratio = 1:1.5:3

How much dry volume of concrete is required for 100 sqft 6 inch roof slab?

1) Wet volume =Area × thickness of slab

Wet volume = 100 sqft × 0.5 ft = 50 CFT

2) Dry volume:-

We know that wet volume have voids and pore which filled with water and bubbles it can be remove by vibrator or compressor machine so more quantity of material is required.

Dry volume means mixture of cement sand and aggregates concrete in dry condition have more voids and pores that are evaporated in wet condition and volume is decrease by 54 percent in wet condition and volume of dry concrete in increased by 54% , so we can multiply 1.54 in wet volume to calculate dry volume

Dry volume of concrete = 50 CFT × 1.54 = 77 CFT

1 cubic meter = 35.32 CFT

Dry volume of concrete in m3 = 77/35.32 m3 = 2.180 m3

For 100 sqft 6 inch slab dry volume of concrete required is 2.180 m3

Mix ratio = 1:1.5:3 ( 1 part cement,1.5 parts sand and 3 parts is aggregate)

Total Proportion of mix = 1+1.5+3 = 5.5

Parts of cement = 1/5.5

Weight of cement = 1/5.5 × dry volume in m3 × density of cement

Density of cement = 1440kg/m3

Weight of cement required for 100 sq ft RCC slab =1/5.5 × 2.180 m3 ×1440 kg/m3

Weight of cement = 570 Kg

1 bag cement = 50kg

No. of bags of cement = 570/50

Number of cement bags are required for 100 sqft 6 inch slab = 11.5 bags.

Therefore, the typical amount of cement required for **100 sq ft** (square feet) of reinforced **concrete slab** (RCC roof) at 6 inches thick is about **570 kg** (or approx. **11.5 bags** of 50kg cement).

Therefore, at 6″ thick, the amount of cement required for a 100 sq ft rcc roof slab is about 570 kg (or 11.5 50kg bags).

**Cement required for 100 sq ft roof slab 5 inch thick**

How many cement bags required for 100 square feet 5 inch thick RCC slab? For this calculation we have given following

Area of rcc slab is 100 sq ft and their thickness is 5 inch which is equal to 0.417 feet, so first we calculate wet volume of concrete, for calculating wet by volume of concrete we multiply area of RCC slab and thickness.

Wet volume of concrete is equal to 100 sq ft × 0.417 ft = 41.7 cu ft.

For converting wet volume of concrete into dry volume of concrete we will multiply 1.54 into wet volume of concrete.

Dry volume of concrete is equal to 41.7 cuft × 1.54 = 64.218 cu ft

Cement required for 100 sq ft slab in m20 grade of concrete is equal to

= 1/5.5×64.218/35.3147 m3×1440 kg/m3

Weight of cement = 476 kg

No. of cement bags required for 100 sq ft slab is calculated by dividing weight of cement by 50 because one bag cement weight is 50 kg

No. of cement bags = 476/50 = 9.5 bags

Therefore, the typical amount of cement required for 100 sq ft (square feet) of reinforced concrete slab (RCC roof) at 5 inches thick is about 476 kg (or approx. 9.5 bags of 50kg cement).

Therefore, at 5″ thick, for M 20 concrete, the amount of cement required for a 100 sq ft rcc roof slab is about 476 kg (or 9.5 bags).

**Cement required for 100 sq ft roof slab 4 inch thick**

How many cement bags required for 100 square feet 4 inch thick RCC slab? For this calculation we have given following

Area of rcc slab is 100 sq ft and their thickness is 4 inch which is equal to 0.334 feet, so first we calculate wet volume of concrete, for calculating wet by volume of concrete we multiply area of RCC slab and thickness.

Wet volume of concrete is equal to 100 sq ft × 0.334 ft = 33.4 cu ft.

For converting wet volume of concrete into dry volume of concrete we will multiply 1.54 into wet volume of concrete.

Dry volume of concrete is equal to 33.4 cuft × 1.54 = 51.436 cu ft

Cement required for 100 sq ft slab in m20 grade of concrete is equal to

= 1/5.5×51.436/35.3147 m3×1440 kg/m3

Weight of cement = 380 kg

No. of cement bags required for 100 sq ft slab is calculated by dividing weight of cement by 50 because one bag cement weight is 50 kg

No. of cement bags = 380/50 = 7.6

Therefore, the typical amount of cement required for 100 sq ft (square feet) of reinforced concrete slab (RCC roof) at 4 inches thick is about 380 kg (or approx. 7.6 bags of 50kg cement).

Therefore, at 4″ thick, the amount of cement required for a 100 sq ft rcc roof slab is about 381 kg (or 7.6 50kg bags).

Now we have question how many cement bags required for 100 sq ft slab we have answer

● **Ans. :-** 7.6 bags (381.30 kgs), 9.5 bags (476.10 kgs) & 11.4 bags ( 570.8 kgs) cement are required for 100 sq ft rcc roof slab 4 inch, 5inch & 6 inch thick respectively in m20 grade of concrete.

**How much cement required for 1 sq.feet area**

The amount of cement required for 1 sq.feet area (RCC slab) is about 4.76kg, and in case of wall plaster approximately 0.85kg of cement are required.

**100 square feet me kitna cement lagega**

At 4″ RCC slab, the amount of cement required for 100 square feet is about 382kg (or 7.6 50kg bags), and for plaster 85kg or approx 2 50kg bags cement are required. So, 100 square feet me **8 50kg** bags cement lagega.

**How much cement required for 100 sq ft RCC slab 5″ thickness? **

Using M20 concrete, the typical amount of cement required for 100 sq ft (square feet) reinforced concrete slab (RCC roof) at 5″ thickness is 476 kg (or 9.5 bags). So at 5″ thickness & M20 mix, RCC slab requires 476** kg **of cement per 100 square feet.

**How much cement required for 100 sq ft RCC slab 6″ thickness? **

Using M20 concrete, the typical amount of cement required for 100 sq ft (square feet) reinforced concrete slab (RCC roof) at 6″ thickness is **570 kg** (or **11.5** bags). So at 6″ thickness & M20 mix, RCC slab requires **570 kg **of cement per 100 square feet.

**How much cement required for 100 sq ft RCC slab 4″ thickness? **

Using M20 concrete, the typical amount of cement required for 100 sq ft (square feet) reinforced concrete slab (RCC roof) at 4″ thickness is 380 kg (or 7.6 bags). So at 4″ thickness & M20 mix, RCC slab requires **380 kg **of cement per 100 square feet.

◆Now your turn:- please like and comment it above this post, if you have any query and question about this please you will ask, thanks a”lot.

**◆You Can Follow me on Facebook and Subscribe our Youtube Channel**

**You should also visits:-**

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

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

**Conclusion:**

At 4″ RCC slab, the amount of cement required for 100 sq ft is about **7.5 50kg** bags (or total 380kg), and at 5″ thick, **9.5 50kg bags** (or total 476 kg) cement are required.

I’m okay please.

Thank you

best regard.

Superb explanation. Nice to share this to all people.

Very good job

Hello friends , first of all I would like to introduce about myself I am Ghouse mohiddin working as a civil contractor in Hyderabad