The number of cement bags needed for a roof slab depends on various factors such as the thickness of the slab, the mix ratio of concrete, and wastage. On average, you might need around 7-9 bags per cubic meter of concrete. For a 1000 sqft roof slab, it would be 75 to 115 bags of 50 kg cement.

How much cement is required for 1000 sqft 6 inch roof slab? and also know about how many cement bags required for 1000 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 1000 sqft 6 inch slab? And we know M20 mix Ratio is 1 : 1.5 : 3 in which one part is cement 1. 5 part is sand and 3 part 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 1000 sqft 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 required for 1000 sq ft roof:**– cement required for roof slab will depend on thickness of roof, thickness of roof varies between 4 to 6 inch as construction design, cement required for 1000 sq ft roof is ranging between 76 to 114 bags of cement.

Let us now calculate how many cement bags required for 1000 sq ft slab 6 inch thick

**How many cement bags required for 1000 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 = 1000 sqft

Mix ratio = 1:1.5:3

**How much dry volume of concrete is required for 1000 sqft 6 inch slab?**

1) wet volume =Area × thickness of slab

Wet volume = 1000 sqft × 0.5ft = 500 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 = 500 cft × 1.54 = 770 cft

1 cubic meter = 35.3147 cft

**Dry volume of concrete in m3 = 770/35.3147 m3 = 21.80 m3**

For 1000 sqft 6 inch slab dry volume of concrete required is 21.80 m3

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**How much cement bags is required for 1000 sqft 6 inch slab?**

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

Total P = 1+1.5+3 = 5.5

Part of cement = 1/5.5

in M20 mix 1 part is cement quantity

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

Density of cement=1440kg/m3

Weight =1/5.5× 21.80 m3×1440 kg/m3

Weight of cement = 5708 Kg

1 bag cement = 50kg

No. of bags of cement = 5708/50

Number of cement bags are required for 1000 sqft 6 inch slab = 114 bags.

How many cement bags required for 1000 sq ft slab?their ans will be: 114 bags (5708 kgs) cement are required for a 1000 sq ft slab 6 inch thick

**Cement required for 1000 sq ft slab 5 inch thick**

How many cement bags required for 1000 square feet 5 inch thick RCC slab? For this calculation we have given following

Area of rcc slab is 1000 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 1000 sq ft × 0.417 ft = 417 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 417 cuft × 1.54 = 642.18 cu ft

Cement required for 1000 sq ft slab in m20 grade of concrete is equal to

= 1/5.5×642.18/35.3147 m3×1440 kg/m3

Weight of cement = 4761 kg

no of cement bags required for 1000 sq ft slab is calculated by dividing weight of cement by 50 because one bag cement weight is 50 kg

no of cement bags = 4761/50 = 95

● Ans. :- 95 no of cement bags (4761 kgs) are required for 1000 sq ft slab 5 inch thick m20 grade concrete

**Cement required for 1000 sq ft slab 4 inch thick**

How many cement bags required for 1000 square feet 4 inch thick RCC slab? For this calculation we have given following

Area of rcc slab is 1000 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 1000 sq ft × 0.334 ft = 334 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 334 cuft × 1.54 = 514.36 cu ft

Cement required for 1000 sq ft slab in m20 grade of concrete is equal to

= 1/5.5×514.36/35.3147 m3×1440 kg/m3

Weight of cement = 3813 kg

no of cement bags required for 1000 sq ft slab is calculated by dividing weight of cement by 50 because one bag cement weight is 50 kg

no of cement bags = 3813/50 = 76

● Ans. :- 76 no of cement bags (3813 kgs) are required for 1000 sq ft slab 4 inch thick m20 grade concrete.

How many cement bags required for 1000 sq ft slab? their ans will be following: 76 bags (3813 kgs), 95 bags (4761 kgs) & 114 bags ( 5708 kgs) cement are required for 1000 sq ft slab 4 inch, 5inch & 6 inch thick respectively in m20 grade of concrete.

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