# How To Calculate Steel Quantity For Roof Slab?

Steel Quantity Calculation Formula = (total length – clear cover)/center to center spacing + 1 main bar, = (5000 – (25+25))/100 + 1, = 4950 divided by 100 + 1, = 51 bars., distribution bar = (2000 – (25+25))/125 + 1, = 1950 divided by 125 + 1, = 17 bars.

### How do I calculate how much steel I need for a slab?

How much quantity of steel required for slab, beam, column and footing per 1m3 of concrete –

1. Example 1
2. IN SLAB
3. How much quantity of steel required in slab per 1m3 of concrete
4. ● As given volume of concrete 1m3 of slab

● Calculate Steel quantity in slab as 1% of volume of concrete = 0.01× 7850× 1= 78.50kg:- according to using Thumb Rule Steel quantity required for RCC slab should be 1% of total volume of concrete, here steel density = 7850 kg/m3, so quantity of steel in 1m3 of concrete slab = 0.01× 7850× 1= 78.50kg, so, therefore 78.50kg of Steel are required for slab per 1m3 of concrete.

• Example 2
• FOR COLUMN
• How much quantity of steel required for column per 1m3 concrete.
• ● As given volume of concrete 1m3 of column

● Calculate Steel quantity required for column as 2.5% of volume of concrete = 0.025× 7850× 1= 196kg:- according to using Thumb Rule Steel quantity required for RCC column should be 2.5% of total volume of concrete, here steel density = 7850 kg/m3, so quantity of steel in 1m3 of concrete column = 0.025× 7850× 1= 196kg, so, therefore 196kg of Steel are required for column per 1m3 of concrete.

1. Notes : 196kg of Steel are required for column per 1m3 of concrete.
2. Example 3
3. FOR BEAM
4. How much quantity of steel required for beam per 1m3 concrete.
5. ● As given volume of concrete 1m3 of beam

● Calculate Steel quantity required for beam as 2% of volume of concrete = 0.02× 7850× 1= 157kg:- according to using Thumb Rule Steel quantity required for RCC beam should be 2% of total volume of concrete, here steel density = 7850 kg/m3, so quantity of steel in 1m3 of concrete beam = 0.02× 7850× 1= 157kg, so, therefore 157kg of Steel are required for beam per 1m3 of concrete.

• Notes : 157kg of Steel are required for beam per 1m3 of concrete.
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• Example 4
• FOR FOOTING
• How much quantity of steel required for footing per 1m3 concrete.
• ● As given volume of concrete 1m3 of footing

● Calculate Steel quantity required for footing as 0.5% of volume of concrete = 0.005× 7850× 1= 39.25kg:- according to using Thumb Rule Steel quantity required for RCC footing should be 0.5% of total volume of concrete, here steel density = 7850 kg/m3, so quantity of steel in 1m3 of concrete footing = 0.005× 7850× 1= 39.25kg, so, therefore 39.25kg of Steel are required for footing per 1m3 of concrete.

1. Notes: approx 40kg of Steel are required for footing per 1m3 of concrete.
2. Conclusion: To calculate the quantity of steel needed for rcc structure, multiply the Length, Width and Thickness in meter to get volume of concrete in m3.
3. Multiply 1% to volume of concrete slab to density of steel (7850 kg/m3) to get quantity of steel required for slab in kg.

: How to calculate quantity of steel in slab, column, beam & footing

## How do you calculate steel Qty?

Stirrups –

Compute cutting length of stirrups using the following equation

Cutting length=2*((w-cover)+(h-cover))+Ld Equation 10 where: w: column width h: column depth Ld: stirrup development length 2. Calculate number of stirrup by dividing column height over stirrup spacing plus one.3. Estimate total length of stirrup which is equal to stirrup cutting length times number of stirrups.4.

### How do you calculate iron on a roof?

Steel required for 100 sq ft roof slab – We we have given area of RCC slab is equal to 100 square feet and thickness of RCC slab is 4 inch, 5 inch and 6 inch thick. ● 1) Steel required for 100 sq ft slab 4 inch :- area of RCC slab is equal to 100 square feet and thickness of RCC slab 4 inch,then volume of concrete it is calculated by multiplying area and thickness of slab.

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Wet volume of concrete is equal to multiplication of area and thickness of slab 100 sq ft × 4 inch/12 = 33.4 cu ft, so wet volume of concrete equal to 33.4 cu ft. Now we convert volume of concrete into cubic metre, 1m3 = 35.3147 cuft, then wet volume of concrete in cubic meter = 33.4/35.3147 = 0.944 m3, now volume of concrete is equal to 0.944 m3.

Thumb rule for Steel required for RCC slab is 80 kgs/m3, then quantity of steel required for 100 sq ft ( 0.944 m3) rcc slab is equal to = 80 × 0.944 = 75.5 Kgs. Ans. :- 75.5 Kgs steel quantity are required for 100 sq ft 4 inch thick rcc roof slab. ● 2) Steel required for 100 sq ft slab 5 inch :- area of RCC slab is equal to 100 square feet and thickness of RCC slab 5 inch,then volume of concrete it is calculated by multiplying area and thickness of slab.

1. Wet volume of concrete is equal to multiplication of area and thickness of slab 100 sq ft × 5 inch/12 = 41.7 cu ft, so wet volume of concrete equal to 41.7 cu ft.
2. Now we convert volume of concrete into cubic metre, 1m3 = 35.3147 cuft, then wet volume of concrete in cubic meter = 41.7/35.3147 = 1.18 m3, now volume of concrete is equal to 1.18 m3.

Thumb rule for Steel required for RCC slab is 80 kgs/m3, then quantity of steel required for 100 sq ft ( 1.18 m3) rcc slab is equal to = 80 × 1.18 = 94.5 Kgs. Ans. :- 94.5 Kgs steel quantity are required for 100 sq ft 5 inch thick rcc roof slab. ● 3) Steel required for 100 sq ft roof slab 6 inch :- area of RCC slab is equal to 100 square feet and thickness of RCC slab 6 inch,then volume of concrete it is calculated by multiplying area and thickness of slab.

• Wet volume of concrete is equal to multiplication of area and thickness of slab 100 sq ft × 6 inch/12 = 50 cu ft, so wet volume of concrete equal to 50 cu ft.
• Now we convert volume of concrete into cubic metre, 1m3 = 35.3147 cuft, then wet volume of concrete in cubic meter = 50/35.3147 = 1.416 m3, now volume of concrete is equal to 1.416 m3.

Thumb rule for Steel required for RCC slab is 80 kgs/m3, then quantity of steel required for 100 sq ft ( 1.416 m3) rcc slab is equal to = 80 × 1.416 = 113.3 Kgs. Ans. :- 113.3 Kgs steel quantity are required for 100 sq ft 6 inch thick rcc roof slab. Now question is how much steel required for 100 sq ft slab ? ● Ans.

#### What is the thumb rule for steel calculation?

Example calculation: Steel quantity = Volume of Concrete x Density of Steel x % of Steel. For example, if a volume of concrete 1 m 3 for a slab. Approx Steel requirement = 1 x 7850 x 1% = 78.5 Kg/m 3.

#### How much mm steel is used in slab?

Bars smaller than 6 mm diameter or greater than 18 mm are not used for slabs.10 mm or 12 mm plain M.S. bars or 8 mm or 10 mm tor-steel bars are generally used. They are provided at the bottom of the slab allowing minimum cover of 25 mm of concrete.

## What is the formula of steel?

The formula is D²/162, where ‘D’ is the diameter of the steel bar.

#### How do you calculate 12mm steel?

12mm dia bar = (12x12x1)/162.28 = 0.8874kg.

## What is the formula for roofing?

Calculating the Area (True) – If you want to get the exact area measurement for your roof, you can follow these steps:

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: How to Calculate Roof Area

### How do I calculate how much roofing material I need?

What is a “Roofing Square”? – Roof surfaces are measured in “squares”. A roofing square is equal to 100 square feet of the roof. To determine the number of squares on the gable roof example in this post, divide its total of 2400 square feet by 100 (2400 ÷ 100 = 24). Get your FREE aerial roof report! Keep the report on hand for future conversations with roofers or when reviewing estimates for your next roof replacement or repair,

### How do you calculate sheet metal for a roof?

Understand The Specifics of Your Chosen Metal Panels – Not all metal panels will measure the same height or width. Before you complete our order, ask your supplier what is the width of the panels you have chosen. Once you know the width of these panels, you will be able to divide the length of the roof by the panels’ width.

### How do you calculate kg of steel?

Width * Length * Thickness * Density = Weight.

#### What is the 5% rule of thumb?

Rule of Thumb Definition A rule of thumb is a general, simplified principle to help guide your investments. For example, always save 5% of your earnings to use in case of an emergency. The phrase is often said to come from an English legal ruling that allowed a man to beat his wife with a stick so long as it was no thicker than his thumb.

## What is 162.2 in steel calculation?

Unit Weight of steel is D2/162 and how is it derived ? generally density of steel is 7850 kilogram per cubic metre and stainless steel generally vary in weight and density like 7480 to 8000 kilogram per cubic metre according to their composition. In this topic we know about weight of Steel bar and it’s formula D square/162. Unit Weight of Steel

## What is thumb rule formula?

Thumb rules refers to an easily learned process or standard based on practical experience rather than theory. It is not intended to be strictly accurate or reliable for every situation.Thumb rules give us the quick decisions at construction field. It provides with the rules of mathematical formula and broad ideas whenever needed.

1. As a engineer, we have to be practical and quick in the field of construction.
2. Basically,thumb rule is the guide for civil engineers for predictable results.
3. It can vary to some percent but it will give a general idea as well.When we compare to get the result, the units in the thumb rules are not the same.

Therefore, never consider units when performing the thumb rule.There are several thumb rules that we apply in construction. Here I am discussing the most frequently used thumb rules on the site. Thumb rule to calculate the Concrete Volume with respect to area: The Concrete Volume of 0.038 m 3 of concrete is used for each Square Feet of Plan area. Building plan area The plan area is 1125 SFT then the total volume of concrete required = 1125 x 0.038 m 3 = 42.75 m 3 Thumb rule to calculate the Steel quantity required for Slab, Beams, Footings & Columns: For Residential buildings – 4.5Kgs – 4.75 Kgs /SFT For Commercial buildings – 5.0Kgs – 5.50 Kgs/SFT For more accurate results you can also use BN Datta recommendations:- As per B N Datta, the Steel quantity used in different members of the building can be calculated easily using the following recommendations. Examples: FOR SLAB: How to calculate the steel quantity of slab having the Length, width, and depth of the slab is 6m x 5m x 0.15m Step 1: Calculate the Volume of Concrete Total Volume of Concrete for above given Slab is 6 x 5 x 0.15 = 4.5 m 3 Step 2: Calculate the steel quantity using formula As per the above table, the steel quantity of slab is 1% of the total volume of concrete utilized.

Thumb rule to calculate Steel quantity of above slab = Volume of Concrete x Density of Steel x % of Steel of Member Steel quantity required for above slab = 4.5 x 7850 x 0.01 = 353 Kgs FOR COLUMN: How to calculate the steel quantity of column having the Length, width, and height of the slab is 1.2m x 0.3m x 4.2 m Step 1: Calculate the Volume of Concrete Total Volume of Concrete for above given column is 1.2 x 0.3 x 4.2 = 1.512 m 3 Step 2: Calculate the steel quantity using formula As per the above table, the steel quantity of column is 2.5% of the total volume of concrete utilized.

Thumb rule to calculate Steel quantity of above slab = Volume of Concrete x Density of Steel x % of Steel of Member Steel quantity required for above slab = 1.512 x 7850 x 0.025 = 297 Kgs Similarly, you can calculate for Beam and Footings. Thumb rule to calculate the Shuttering area: Shuttering costs 15-18% of the total construction of the building.

• Shuttering is framed to bring the concrete in Shape and giving a desired mould in terms of quality.
• Thumb rule to calculate the shuttering required is 6 times the quantity of concrete or 2.4 times of Plinth area.
• Suppose, the concrete quantity is 0.8 m 3, then the shuttering area required is 0.8 x 6 = 4.8 m 2 Components of Shuttering:- Components of Shuttering are shuttering ply, battens and nails.
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Shuttering Ply Quantity calculation: The shuttering Ply has a length, width & depth of 2.45 x 1.22 x 0.012 The No. of Shuttering Ply sheets = 0.22 times of Shuttering Suppose, the area of shuttering required = 4.8 m 2 Then the Shuttering Ply required = 0.22 x 4.8 = 1.056 m 2 Battens Quantity Calculation: Battens have different widths but we usually use shuttering batten having a length & width of 75mm x 40mm.

Batten Quantity = 19.82 x No. of Ply Sheets if the construction requires 32 Ply sheets, the total quantity of Battens are 19.82 x 32 = 634 Battens Thumb rule for Shuttering oil Quantity: Shuttering oil is used to de-frame or de-assemble from the concrete easily. Total required Shuttering oil is = 0.065 x Total Area of Shuttering (or) For every 15 m 2 of shuttering 1 litre of shuttering oil is consumed.

Example : 15 m 2 is total area of shuttering, then Shuttering oil required = 0.065 x 15 = 0.975 litres Nails & Binding Wire Quantity in Shuttering: 75gms of Nails are used for 1 m 2 of Shuttering 75gms of Binding wire is consumed for every 1 m 2 of Shuttering.

### Which rod is best for roof?

Cheap and best TMT bars in Udaipur – In Bihar, Patna, there are various TMT bar manufacturing and producing companies which provide cheap and best TMT bars with grade Fe500 and Fe550 for construction are 1) Shyam Steel, 2) Kay2 tmt bar, 3) captain TMT bar, 4) Balmukund TMT, 5) Amba Shakti TMT, 6) Magadh TMT bar, 7) Durgapur TMT, 8) Patwari TMT bar, 9) Mahan TMT 500, 10) Gisco Thermax TMT bar, etc.

## What is TMT full form?

The full form of TMT Bar/Rebar is Thermo Mechanically Treated bars. We all know that TMT Bars are essential for all type of construction purposes but it is also important to know how it is made. Best Quality TMT Bars pass through series of processes that determines the strength & flexibility of it.

QuenchingSelf TemperingAtmospheric cooling

The quality of TMT Bar depends on three major factors

Quality of raw materialsQuality rolling mill that gives the uniform and proper shape for all rebarsQuality system for quenching and tempering

## How do I calculate how much material I need for a concrete slab?

What equation should I use to find out how much concrete I need? – How to calculate concrete:

1. Determine how thick you want the concrete
2. Measure the length and width that you’d like to cover
3. Multiply the length by the width to determine square footage
4. Convert the thickness from inches to feet
5. Multiply the thickness in feet by the square footage to determine cubic feet
6. Convert cubic feet to cubic yards by multiplying by,037

Here’s what the math looks like for a 10′ by 10′ concrete patio:

1. 10 x 10 = 100 square feet
2. 4 ÷ 12 =,33
3. 100 x,33 = 33 cubic feet
4. 33 x,037 = 1.22 cubic yards

Essentially you are solving for volume and then converting to cubic yards. For concrete, the formula for volume is as follows: length x width x thickness. To determine how many bags of concrete you will need, divide the total cubic yards needed by the yield. Use the following yields per each bag size:

• 40 pound bag yields,011 cubic yards
• 60 pound bag yields,017 cubic yards
• 80 pound bag yields,022 cubic yards

### How do you calculate reinforcement for a slab?

The Steel Mesh calculator – When wondering if you need mesh in your concrete slab, or figuring out how much mesh you need, firstly, you need to calculate the area of your concrete slab. To do this simply multiply the length of the slab by the width. Here is the formula: Length x Width = Slab Area (m2) For example: For measuring a more complex concrete slab design, try to break the total area into separate rectangles or squares. Calculate each one and then add them all together to find your total area, for example: Now that you have your area calculation, you need to divide the area by 12.5. This will give you the number of steel mesh sheets required to reinforce your concrete slab. Here is the formula: Slab Area (m2) ÷ 12.5 = Total number of 6m x 2.4m sheets For example: