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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**

**Shuttering Ply Quantity estimation**

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

**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**

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## 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.

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

Mohd mehrajIn have 2plots. 23*29. Second 25*36. TOTAL LENGTH 48. IF I TAKE SQURE 48*29. PLS HELP ME FOR G+ 2 PLAN . GROUND.FLOOR FOR OWNER 1 AND 2 FLOOR FOR RENTAL

Manikandan RMKI leaning for more Impermation at this web site. All comments is very correct and easy to leaning the method.

ukasReally useful this article

Devendra shindevery usefull

RuwanCan you please tell me thumb rule estimation for aluminium and glass facade multi storey buildings?

PushprajHow to downlode pdf

Rohit KhandeSir , this article is very usefull

Thank you sir

Sir please provide complete rrc design of g+1 building

Ranjan PirkeWhere is the link for downloading this Article?

Mike Mahajansave as pdf

Load Calculation on Column, Beam & Slab

Steel DetailingThanks to its very good explanation of how to calculate the full detail in Thumb rules very inforamtive topic. How to download its details aside from the screenshot to be used?