Area = Width * Height

Total Area without windows and doors substituted = Total area - (Area of window + area of door)

Total Area with windows and doors substituted = Total area + (Area of window + area of door)

Number of cans = Total area/canval

where,

Square Feet of Roof = (sqrt( (pitch

Squares of Roof=(Square Feet of Roof*span*length) / 144 LLratio is = (Squares of Roof / 100);

where,