Need tread size for 8" riser steps.

Intersting to note that on the osha website the table does not list the "7-11" rule. It shows for 7" risers to use 10 1/2" tread. And for 6

The general rule is that the tread + the rise should be between 17 and 18. For example, an 11" tread plus a 7" rise equals 18. It's a ratio that will provide a comfortable "feel" to the stairs regardless of their pitch.

For an 8" rise, you would want something between a 9" and 10" tread. Go for the wider tread if you have the room.

Note that the tread width does not include any "nosing" on the tread. This can extend about an inch beyond the tread width. So, for a stair carriage cut with 10" treads, you might have a step that is actually 11" deep.

Anthony

You should check you local building codes.

Rule of 17 would indicate 9" treads. Rule of 18 would indicate 10" treads.

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I think 10" treads are the minimum currently allowed.

Don't think 8" risers are allowed any more either. Seem to recall 7 or 7.5 as the max.

Of course your area could vary either way.

Colbyt

Thanks for everyones responses. After thinking about this for 2 days, I am going to play it safe and go with 7" risers. The only thing is I have to move some shrubs out of the way due to the overall longer run, but not a big deal.

This got me curious so I just measured my steps 7 1/2" rise and 9 1/2" run