# Thumb rule for site Engineers

**Thumb rule for Steel quantity required for Slab, Beams, Footings & Columns:**

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.

#### 2. **Percentage of Steel in Structural Members:**

1) Slab – 1% of the total volume of concrete

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

**Process of Hiring Architects for construction ?**

**Example:**

How to calculate the steel quantity of slab having the Length, width, and depth of the slab is 9 m x 4 m x 0.125 m

**Calculate the Volume of Concrete**

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

= 4.5 m3

**Calculate the steel quantity using formula**

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 = 4.5 x 7850 x 0.01 =** 353.25 Kg**

#### Thumb Rules to estimate the Shuttering area:

**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

**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 gms 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.