MATERIAL WASTE BUFFER
Roof Waste Calculator
Calculate the extra scrap allowance and total order square footage needed for roof hips, valleys, gables, and starter strips.
Roof Waste Calculator
Calculate the scrap material buffer and total order area needed for your roof geometry.
sq ft
Roof Waste Calculation
$$text{Waste Area} = text{Base Area} times frac{text{Waste %}}{100}$$
$$text{Total Material to Order} = text{Base Area} times left(1 + frac{text{Waste %}}{100}right)$$
Standard gable roofs require 10% waste for trimming and starter rows, while complex hip roofs with multiple valleys typically require 15% to 20% waste.