# How can I slope outdoor rounded steps?

I'm having a debate with my contractor about sloping our outdoor stairs. I hope to have 1% slope because we get a lot of rain. But because the steps are rounded, my contractor says the difficulties may result in rather dangerous rise discrepancies. Any advice how we can solve the sloping or should I just make them flat?

• Just to clarify: +80, +60, etc. - are those # of cm above some base level? Commented Dec 25, 2019 at 18:30
• Yes. Street level is 0. Commented Dec 25, 2019 at 18:34
• Are these to be wood or concrete steps?
– Jack
Commented Dec 25, 2019 at 19:04
• the main problem I see is the discrepency between the front and the side treads, at 5% slope and assuming the deck to be 3m wide the steps at the front (next to the green bit) are in total 60cm high, while at the side (next to the wall) after 300cm of 5% rise less 300cm of 1% rise they are only 48cm high. Commented Dec 25, 2019 at 20:54
• @Jasen Yes there will be that going on. The difference could be split from the center of the arc so that one side is a little taller and the other side a little shorter. Or the difference could be calculated overall and slightly taper the bending forms that will make the risers so that at any given path a person may take up the stairs, the rise will be uniform. With concrete form work, this will be pretty easy but it would be trouble for the tile setter, to a degree....Only on the risers. Tiling the risers first would make it a bit easier...
– Jack
Commented Dec 25, 2019 at 22:17