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I've found that it works great when I can actually place the phone on the roof or when I can view the rake dead-on.

A lot of people try to use this app to measure the angle of the roof from the ground. That introduces errors and doesn't work.

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A lot of people try to use this app to measure the angle of the roof from the ground. That introduces errors and doesn't work.

I think the errors are too small to be significant when the phone is held within the same place plane as the corners of the roof surface.

My hip roof is 6/12 and my reading, with the three corners in the same plane as the phone, hovered between 5.9 and 6.1

Marc

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I've found that it works great when I can actually place the phone on the roof or when I can view the rake dead-on.

A lot of people try to use this app to measure the angle of the roof from the ground. That introduces errors and doesn't work.

Also, the shingles on the roof can pitch back as they overlay each course. So, you should lay a straight edge over several courses and put the measuring device on that. A smart phone alone is too short for that.

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