Though it can be done, installing a gate on a slope is not advisable. The slope can create problems with opening and closing the gate, which could render it difficult to use. If at all possible, finding a flat area for the gate is the best bet.
However, if there’s no other good place for the gate, there are some things that can be done to accommodate the gate to the slope. Narrower gates work better on slopes because they have a smaller range of motion and are less likely to run into the ground. If the ground does interfere with the action of the gate, a little digging and landscaping in problem areas can solve the issue. A gate installed on a slope should open on the downward side of the slope so the ground doesn’t interfere.
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Our state-of-the art manufacturing and sand blasting facility is located just 60 miles north of Washington D.C. We also offer onsite, top of the line paint and powder coating. Our dedication has enabled Hercules Custom Iron to become a revolutionary company respected throughout the industry. We are proud to of our place as a leading manufacturer of custom iron work throughout, Maryland, Virginia, Pennsylvania and the Washington D.C. Metropolitan Area. We look forward to having you Contact Us to learn more about how we can help you with your next custom iron, specialty metal or aluminum project!
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Source
http://www.fencespecialists.com/blog/fencing-tips/should-i-install-a-gate-on-a-slope/