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A rolling offset is generally an offset requiring a change in 2 directions. Eg. A horizontal offset and a vertical change in elevation. There is additional information required to answer the question. What is the angle of the fittings being used for offset? 15 deg. 30. 45? What is the change in elevation?

If this is a flat (no change in elevation offset) using 45 deg., the offset dimension (7') is multiplied by 1.4142 which is the secant and cosecant of 45 deg.

The result 7 ' x 1.4142 = 9'-10 13/16"

Again, this result is for a flat run of pipe. If we have a rolling offset with a change in elevation of say 1'. We can use the Pythagorean theorem (A2 +B2 = C2)

The result would be (1')2 + (9'-10 13/16")2 = 98.99812 sq. ft.

The square root of 98.99812 is 9'-11 3/8"

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7y ago

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Q: How do you figure a 7 foot horizontal rolling offset?
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