Thumb Rules For Civil Engineers

Thumb Rules for Civil EngiRules For Civil Site Engineer pdf

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 o 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.

Thumb Rules For Civil Engineers
Thumb Rules For Civil Engineers

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: 50 + Civil Engineering Interview Questions & Answers


Thumb Rules for Civil Engineering In Construction

following are thumb rule 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 rule 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: Top 10 Civil Engineering Site Work


3) Percentage of Steel in Structural Members

following are thumb rule 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

= 3m3

thumb rule for steel in rcc

Step 2: Calculate The Steel Quantity Using Formula:

As per the guidelines are given in the B N 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

Thumb Rules for Civil Site Engineer pdf

Read More: Civil Construction Material Calculator


4) Thumb Rules For Shuttering Work

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

For example, the concrete quantity is 0.5m3, then

Area of Shuttering is 0.5 x 6 = 3m2

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 = 0.66m2


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:

Approximately, 75 gams of Nails 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.

Thumb Rules For Civil Engineering

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 brick work and cement quantity calculations.

Brickwork for 1m3 Cement Qty in m3 Cement Qty in Bags
230 mm Brickwork
0.876m3 25.4 Bags
115 mm Brickwork 0.218m3 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/m2
6.2Kgs/m2
150mm in Cement Masonry work
of Ratio 1:6
0.093Bags/m2
4.65Kgs/m2
200mm in Cement Masonry work
of Ratio 1:4
0.206Bags/m2
10.3Kgs/m2
150mm in Cement Masonry work
of Ratio 1:4
0.144Bags/m2
7.2Kgs/m2
100mm in Cement Masonry work
of Ratio 1:4
0.103Bags/m2
5.15Kgs/m2
Thumb Rules for civil engineering

8) Thumb Rules Plastering Quantity

Type of Plastering Cement Qty in Bags Cement Qty in Kgs
Rough Plastering0.09 Bags/m2 4. 5Kgs/m2
Internal Wall Plastering0.09 Bags/m2 4.5 Kgs/m2
Duct Plastering 0.09 Bags/m2 4.5 Kgs/m2
External Wall plastering0.175 Bags/m2 8.75 Kgs/m2
Stucco Plastering0.175 Bags/m2 8.75 Kgs/m2
Lathen Plastering0.55 Bags/m2 27.5 Kgs/m2
Thumb Rules for civil engineering

FAQs

Q.1 How do you calculate 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 total volume of concrete
4) Footings – 0.8% of the total volume of concrete

Q.2 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.

Q.3 What is the basic knowledge of civil engineering?

BASIC THINGS FOR CIVIL ENGINEER:
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 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.

Q.4 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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17 thoughts on “Thumb Rules for Civil EngiRules For Civil Site Engineer pdf”

  1. The 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?

      1. GAURAV SHRESTHA

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

        OR

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

  2. In 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

  3. Manikandan RMK

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

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

  5. Sir , this article is very usefull
    Thank you sir
    Sir please provide complete rrc design of g+1 building

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