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# Thumb Rules For Civil Engineers In Building Construction

### Thumb Rules For Civil Engineers In Building Construction

Thumb Rules For Civil Engineering is essential for any Civil Engineer, Site Engineers, or Civil Supervisor. They play a crucial role while taking quick decisions on site. There is some Civil Engineering Basic Knowledge that every Civil Engineers must know about this Riles.

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

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

There is 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 & the units are not the same when we compare to get the results. So ignore units while performing the thumb rule.

### 1. 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 & Columns

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 Data Recommendations for the more accurate result,

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

### 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

3. ### How To Calculate The Cutting Length Of Circular Stirrup

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

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

= 3m3

#### 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

### 4. Thumb Rules For Shuttering Work

Shuttering costs are taken as 15-18% of the total construction of the buildingShuttering 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 concretquantity is 0.5m3, then

Area of Shuttering is 0.5 x 6 = 3m2

Components of Shuttering

Shuttering Ply Quantity estimation

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

Suppose, The Shuttering Ply has a lengthwidth 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 = 0.66m2

### 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:

Approximately75 grams of Nails were used in the shuttering of the 1m2 area.

75gms of Binding wire is used for every 1m2 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 15m2 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.

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

Note: 1 bag of cement = 50Kgs

Thumb rule for Cement required in BrickworkCement 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.

### 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 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

#### 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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### About Raja Junaid Iqbal

Hi My name is Raja Junaid Iqbal and i am Land Surveyor by Profession but I've specialized in the field of Q,S and land development. As Professional Surveyor I engaged my self in all over the Gulf since 14 years.

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