Find the square foot area of a roof face (any roof surface) by multiplying its length (side to side) by its height (eave to ridge); measure these dimensions using a tape measure. When finding the area of a hip type roof (a roof with triangular ends), multiply a triangular end height by its width; this will result in the combined area of both ends.
Repeat Step 1 on all remaining roof faces and add to find the total roof area (in square feet).
Divide the total roof area found in Step 2 by the coverage (square footage) of the metal roofing to find the total number of roofing panels needed.
Example: A 500 square foot roof divided by a metal roof panel with a coverage of 20 square feet (2 by 10-foot metal panel) results in 25 metal panels.
Call a local roofing supply center and ask the current cost (per panel) of the metal roofing you will be using.
Multiply the cost per panel found in Step 4 by the total number of panels found in Step 3 to find the total cost of metal roofing.
Things You Will Need
- Tape measure
- Consult with a metal roofing specialist for fastening and underlayment requirements, and adjust total cost accordingly.