Hey Dan, what you got to do is measure height and width, multiply that to get total square feet. Do this for each side of the roof . Then divide total square feet by 100, that gives you the number of" squares". It takes three bundles of three tab shingles to cover a square. But the shingles are staggered and many will need to be cut in half for the edges so depending on how big the roof is get extra three bundles for that at least, if the Pinnacle or cap is done with shingles you will need extra bundle or two for that as well.
Get a measurement of the roof and let them know and they could calculate it for you.
Ask the employee
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