Originally Posted By: jpeck
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I don’t believe there is an “proper” slope.
I think everyone has their own ideas on what works and what does not work. Down here, I find a lot of 'flat' gutters which drain well, and we are talking 40', 50' and longer gutters. As long as it is not reverse sloped it drains well.
Not until you get leaves in it does a problem come up, and the solution is not sloping the gutter but keeping the leaves out.
Thus, I would say the "proper" slope for a gutter is 'as long as it is NOT reverse sloped'.