Things You'll Need:
- Tape measure
- Ladder
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Step 1
You will need access to your roof. Use a safe and strong ladder to accomplish getting there. Take a tape measure with you.
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Step 2
Stretch out the tape from one edge to the other edge. Write down this information.
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Step 3
Stretch out your tape from the ridge to the bottom edge. Write down this number.
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Step 4
Repeat this same technique on all parts of the roof. Some may be smaller or larger. Be sure to include ALL surfaces of the roof.
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Step 5
Multiply the two numbers from each section of roof. Add these numbers together to get your total square feet.
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Step 6
Add a waste factor of approximately 20% to this number.
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Step 7
Divide this new number by 100. Round the number to the next highest full number. You have now calculated the total number of "squares" needed to re-roof your house.











