In this Article, We explained How to calculate Roof sheets for Single Slope (Skillion) Roof. and also we have attached the Roof sheet excel calculator for your use.

__Step 1: Take Roof Measurements__

**Note:** Consider the Length of the Roof Is water flow directions, For
Example

** **

**Example**

**Width** of Roof = 3m

**Length **(water flow direction) = 3.2m

**Roof Angle** = 45°

** **

** **

__Step 2: Calculate Roof Length and width For
Sheet Calculation__

**A. Roof Width**

**Width **of Roof** = Width** of (outer wall to wall) + (2 x **overhang**
sheet length)

Consider Overhang length =
0.3m

**Width **of Roof** **= 3 + (2 x 0.3) **= 3.6m**

** **

**Length **of Roof** **(water flow direction) **= Length **+ (2
x **overhang** sheet length)

**Length of Roof **(water flow direction), As we know Water flow direction
will be sloped. So, we need to find Sloping Length of the roof

**Length **of Roof** **(water flow direction) =

As per Trigonometry, **sin
Î¸ = opposite / hypotenuse**

Consider this Equation on Above
Triangle,

We will take,

**Side (AC)** (water flow direction) = Hypotenuse =?

**Side (BC)** = Opposite = **3.2m**

So,

As we know Roof **Angle Î¸
= 45°**

Sin45° = (3.2m/hypotenuse)

0.707= (3.2/hypotenuse)

**By Cross multiplying,**

Hypotenuse = 3.2/ 0.707 **= 4.526m**

**So, the length **(water flow direction) **of the Roof 4.526m**

**Length **of Roof** = Length **+ (2 x **overhang** sheet
length)

**Length **of Roof** **= 4.526 + 0.6** =
5.126m**

** **

**Also Use: Roof
Pitch Calculator | Roof Slope and Angle Calculator**

__Step 3: Roof Sheet Calculation__

**Consider Roof Sheet Size**

**Length **(water flow direction) of Roof Sheet = 2.4m

**Width **of Roof sheet = 1.2m

*The above image gives you an idea of the Overlapping Area*

**Number of Sheet** Needed in one **Row of Roof width** = Width of Roof/Width
of Roof Sheet = 3.6/1.2 = 3nos

Overlapping = Number of
sheets -1 = 3-1 = 2 nos

Consider **300mm** as the overlapping length so,

**Overlapping** = 2 x 300 = 600mm = 0.6m

**Total Width of Roof** = 3.6 + overlap length = 3.6+0.6 = 4.2m

**Number of
Sheets Needed (overlapping) in width side = 4.2/1.2 = 3.5 – 4 sheets**

**Number of Sheet** Needed in one **Row of Roof length **(water flow
direction) = Length of Roof (water flow direction) / Length of Roof Sheet = 5.126/2.4
= **2.135 no’s**

**Overlapping** = Number of sheets -1 = 2.135-1 = 1.135 - 1 nos

Consider **300mm **as the overlapping length so,

Overlapping = 1 x 300 = 300mm
= 0.3 m

**Total length of Roof** = 5.126 + overlap length = 5.126+0.3 = **5.426m**

**Number of
Sheets Needed (overlapping) in Length side = 5.426/2.4 = 2.26 – 2.5**

** **

** **

**Total Number of Sheets Needed
= 4 (Width) x 2.5 (Length) = 10 sheets**

**Below We have
Attached the Roof sheet calculator for the Single slope Roof For your use.**