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**Thumb Rules For Civil Site Engineer pdf**

**Thumb Rules For Civil Engineering** is essential for any **civil engineer,** Site engineer, or civil supervisor. They play a crucial role while taking quick decisions on site. There is some **civil engineering basic knowledge **that every civil engineer must know.

**The Thumb Rule of Civil Engineering** or the thumb rule for construction helps you in finding out the solution using a simple **mathematical formula** and make smart decisions whenever needed.

But, while using these** thumb rules**, you must remember that the thumb rule never gives the exact or accurate results, you just have used them for **approximate results**.

There is** **a number** **of **Thumb Rule For Civil Engineers **that we used in **construction work**. So, the following are some most frequently used Thumb rules on the **Construction site**.

The Thumb rule method is an **approximate **& **comparing method.** In thumb rules and the **units **are not the same when we compare to get the results. So, ignore **units **while performing the **thumb rule**.

**Read More: Tips for Civil Site Engineers**

**Thumb Rules for Civil Engineering In Construction**

Following are thumb rules in **civil engineering**,

### 1. **Thumb Rule for Concrete Volume**

The **volume of concrete** required = **0.038 m3/square feet **area

**Example:-**If Plan Area = 40 x 20 = **800 Sq. m**.

So, for the plan area of **800 Sq. m.** the area the total volume of** concrete **required

= 800 x 0.038m3 = **30.4m3**

### 2. **Thumb Rule for Steel Quantity for Slab, Beams, Footings & C**olumns

Following are some important **thumb rules** for **steel calculation** for slab, beam, column, and footings.

Steel required in **residential **buildings** = 4.5 Kgs – 4.75 Kgs / sq. Ft.**

Steel required For **Commercial **buildings** = 5.0 Kgs-5.50 Kgs/Sq. Ft.**

You can also use** BN Datta** recommendations for the more accurate result,

The following recommendations** Thumb Rules For Civil Engineering are given in B N Datta** for the Steel quantity used in different members of the building.

**Read More: 12 Roles and Responsibilities of Civil Site Engineer Pdf**

### 3. **Percentage of Steel in Structural Members**

Following are thumb rules for **reinforcement in concrete** members,

1) **Slab **– **1%** of the total volume of concrete (**Slab steel calculation** thumb rule)

2) **Beam **– **2%** of the total volume of concrete

3) **Column **– **2.5%** of total volume of concrete

4) **Footings** – **0.8%** of the total volume of concrete

**Example:**

How to calculate the **steel quantity** of slab having the Length, width, and depth of the slab is** 5m x 4m x 0.15m**

**Step 1: Calculate the Volume of Concrete:**

The Total Volume of **Concrete **for given Slab =** 5 x 4 x 0.15**

=** 3m ^{3}**

**Step 2: Calculate The Steel Quantity Using Formula:**

As per the guidelines are given in the **BN Dutta **reference book the **steel quantity** of slab is **1%** of the **total volume** of concrete utilized.

Thumb rule to estimate Steel quantity of above slab = **Volume of Concrete x Density of Steel x % of Steel of Member**

Steel weight required for above slab = 3 x 7850 x 0.01 = **235Kgs**

For accurate **estimation**, you can refer to **Bar Bending Schedule**

**Read More: Civil Calculator (Civil Engineering Calculator)**

**4. Thumb Rules For Shuttering Work**

**Shuttering** costs are taken as **15-18%** of the **total construction **of the building. **Shuttering work **is done to bring the concrete in Shape. The Thumb rule to estimate the **shuttering **required is **6 times** the quantity of concrete or 2.4 times of the **Plinth area****.**

For example, the **concret**e quantity is 0.5m^{3}, then

Area of **Shuttering **is 0.5 x 6 = 3m^{2}

**Components of Shuttering**

The Shuttering plate **Ply, Battens, Nails** are components of Shuttering.

**Shuttering Ply Quantity estimation**

Suppose, The **Shuttering Ply** has a length, width & depth of 2.44 x 1.22 x 0.012

The No. of Shuttering **Ply Sheets = 0.22 **times of Shuttering

Suppose, the **Shuttering Area** = 3m

Then Ply required for shuttering = 0.22 x 3 = **0.66m ^{2}**

### 5. **Battens Quantity Calculation**

**Shuttering Batten **usually has a **length** & **width **of 75mm x 40mm.

**Batten Quantity = **19.82 x No. of Ply Sheets

If work requires **25 Ply sheets,** the total quantity of Battens are 19.82 x 25 = **495 **Battens

**Nails & Binding Wire Quantity in Shuttering:**

Approximately, **75 grams** of **Nails **were used in the shuttering of the **1m ^{2} area.**

75gms of** Binding wire** is used for every 1m^{2} of Shuttering.

**Thumb rule for Shuttering oil estimation :**

Shuttering oil is applied on the **shuttering plate** surface used to** de-frame** or **de-assemble** from the concrete easily.

**Total required Shuttering oil** = 0.065 x Total Area of Shuttering

(or)

For every **15m ^{2}** of shuttering

**1 liter**of

**shuttering oil**is consumed.

Example :

If, total area of shuttering is 15 m2, then Shuttering **oil Consumption **=** **0.065 x 15 = **0.975.**

**Read More:** **17 Tips For How To Reduce Construction Cost**

**6. Thumb Rule for Cement, Sand, Coarse Aggregate Quantity Calculations**

**Note: 1 bag of cement = 50Kgs**

Thumb rule for Cement required in **Brickwork**, **Cement Masonry **& **Plastering **work in construction.

**7. Thumb Rules For Civil Engineers for Brickwork**

following are **Thumb Rules for civil engineering** for brickwork and **cement quantity** calculations.

Brickwork for 1m^{3} | Cement Qty in m^{3} | Cement Qty in Bags |

230 mm Brickwork | 0.876m^{3} | 25.4 Bags |

115 mm Brickwork | 0.218m^{3} | 6.32 Bags |

**Thumb Rules for Civil Engineering**

**8. Thumb Rules For Cement Masonry Quantity**

Cement Masonry Type & Mix | Cement Qty in Bags | Cement Qty in Kgs |

200mm in Cement Masonry work of Ratio 1:6 | 0.124Bags/m^{2} | 6.2Kgs/m^{2} |

150mm in Cement Masonry work of Ratio 1:6 | 0.093Bags/m^{2} | 4.65Kgs/m^{2} |

200mm in Cement Masonry work of Ratio 1:4 | 0.206Bags/m^{2} | 10.3Kgs/m^{2} |

150mm in Cement Masonry work of Ratio 1:4 | 0.144Bags/m^{2} | 7.2Kgs/m^{2} |

100mm in Cement Masonry work of Ratio 1:4 | 0.103Bags/m^{2} | 5.15Kgs/m^{2} |

**Thumb Rules for Civil Engineering**

**8. Thumb Rules Plastering Quantity **

Type of Plastering | Cement Qty in Bags | Cement Qty in Kgs |

Rough Plastering | 0.09 Bags/m^{2} | 4. 5Kgs/m^{2} |

Internal Wall Plastering | 0.09 Bags/m^{2} | 4.5 Kgs/m^{2} |

Duct Plastering | 0.09 Bags/m^{2} | 4.5 Kgs/m^{2} |

External Wall plastering | 0.175 Bags/m^{2} | 8.75 Kgs/m^{2} |

Stucco Plastering | 0.175 Bags/m^{2} | 8.75 Kgs/m^{2} |

Lathen Plastering | 0.55 Bags/m^{2} | 27.5 Kgs/m^{2} |

**Thumb Rules for civil engineering**

## FAQs

### How do you calculate the steel by thumb rule?

Following are Thumb Rule for reinforcement steel in concrete members,

1) Slab – 1% of the total volume of concrete (Slab steel calculation thumb rule)

2) Beam – 2% of the total volume of concrete

3) Column – 2.5% of the total volume of concrete

4) Footings – 0.8% of the total volume of concrete

### What is a good rule of thumb?

Thumb Rule can be called a guideline, idea, or principle that helps you make quick decisions. **“Arrive early” **is an efficient good Thumb Rule for most appointments. It referred to builders who frequently use their thumb to estimate measurements. It is a helpful rule even being inexact.

### What is the basic knowledge of civil engineering?

**BASIC THINGS CIVIL ENGINEERS** **SHOULD KNOW**,

1. Lapping in reinforcement is not allowed for the bars having diameters more than 36 mm.

2. Steel Char maximum spacing is 1.00 m (or) 1 No per 1m2.

3. In steel dowels, a rod minimum of 12 mm diameter should be used.

4. Steel Chairs minimum of 12 mm diameter bars to be used.

5. Longitudinal reinforcement should not be less than 0.8% and more than 6% of gross C/S.

6. The minimum bars used for a square column are 4 No’s and 6 No’s for the circular column.

### What is the thumb rule to determine beam depth?

The method for determining the width-depth ratio of reinforced concrete beams is not specifically given in codes. However, a thumb rule can be used i.e taking depth that is two and a half to three times the beam’s width. For long-span beams, it is generally economical to use deep and narrow sections.

### Thumb Rules For Civil Site Engineer pdf

**Thumb Rules For Civil Engineering** pdf is essential for any civil engineer, Site engineer, or civil supervisor. They play a crucial role while taking quick decisions on site. There is some **civil engineering basic knowledge **that every civil engineer must know.

### Thumb Rules for Civil Engineering

** Thumb rule requirement of standard materials and standard calculation in high raised building**,

Steel =3 to 5 kg / sqft.

Cement =0.5bags/ sqft.

RMC =0.05 m3/sqft.

Block =12.5 nos /sqm.

Electrical cast = Rs 133/sqft.

Plumbing cost = Rs 126/sqft.

Fire fighting cost = Rs 40/sqft.

External development = Rs 94.5/sqft.

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SARTAJ AHMAD BHATWhat about Culvert and bridge details. Please may send in relevant

RoshanThe volume of concrete required = 0.038 m3/square feet area

Example:-

If Plan Area = 40 x 20 = 800 Sq. Ft.

So, for the plan area of 800 Sq. Ft. area the total volume of concrete required

= 800 x 0.038m3 = 30.4m3o

Sir, plan area square feet Mai hai aur concrete density cubic meter Mai ? It is right sir?

Mike MahajanSorry, Area is 40 x20 m = 800 sq. M

It is by mistake.

Thanks for knowing me

sjsir,

sqm of area and cubic metre of concrete.

can we evaluate like that?

units are not in sync

GAURAV SHRESTHAThe volume of concrete required = 0.038 m3/square feet area

OR

The volume of concrete required = 0.038 m3/square METER area??

SantoshFor 800sqm area 0.38cum conc

Ie 800 x 0.38 = 304cum concrete

SekarCement consumption is 63 kg only for 1 cum bwork .why 24 bags.

Shrikant BendkaleCement content for brickwork is 50-70 kg then why given as 25.4 bag

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ukasReally useful this article

Devendra shindevery usefull

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Thank you sir

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Load Calculation on Column, Beam & Slab