Enter the total roof area and the waste factor into the calculator to determine the shingle waste amount. This calculator helps estimate the additional shingle material needed due to cutting and fitting waste.
Shingle Waste Formula
The following formula is used to calculate the shingle waste amount.
WA = TA * (WF / 100)
Variables:
- WA is the waste amount (square feet)
- TA is the total roof area (square feet)
- WF is the waste factor (percentage)
To calculate the shingle waste amount, multiply the total roof area by the waste factor percentage divided by 100.
What is Shingle Waste?
Shingle waste refers to the extra roofing material that is not used in the main installation due to the need for cutting and fitting shingles to the roof’s shape. This waste factor is typically expressed as a percentage of the total roof area and accounts for the additional material needed to complete a roofing project.
How to Calculate Shingle Waste?
The following steps outline how to calculate the Shingle Waste.
- First, determine the total roof area (TA) in square feet.
- Next, determine the waste factor (WF) as a percentage.
- Next, gather the formula from above = WA = TA * (WF / 100).
- Finally, calculate the Shingle Waste Amount (WA) in square feet.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Total Roof Area (TA) = 2000 square feet
Waste Factor (WF) = 10%
