Stair Risers

[blah387566]

So, how do I manually input the height for each riser in Revit? The automatic calculation is awesome, but I'd like to vary it slightly to make things easier to manufacture. For instance, I'd like the first height to be 7 3/8", and then the next two 7 1/4". Please explain this step-by-step (Barney style) if possible. Thanks.

[Duncan Lithgow]

I'm thinking you'll need multiple runs of component based assembled stairs to get that to work, but I'm no Revit stairs expert. Doesn't sound like an easy task for Revit. I'll be watching this thread with interest.

[dhurtubise]

Not going to be fun trust me :) but I'm concerned about the fact that you will have different risers on a stairs... is that even allowed code wise?
Or is it some exterior "stairs" on a plaza?
If it's a real stair i'd use an InPlace family and would bother with the Stair tool

[blah387566]

Not going to be fun trust me :) but I'm concerned about the fact that you will have different risers on a stairs... is that even allowed code wise?
Or is it some exterior "stairs" on a plaza?
If it's a real stair i'd use an InPlace family and would bother with the Stair tool

Oh come now, 1/8" difference on a single riser isn't going to cause Grandma to fall down the stairs. But since you were wondering...


R311.7.4.1 Riser height. The maximum riser height shall be 7¾ inches (196 mm). The riser shall be measured vertically between leading edges of the adjacent treads. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm).

It concerns me that Revit seemingly will not allow me to manually change riser heights. I assure you, the builder isn't going to be cutting risers to 47/128", that kind of accuracy just ain't gonna happen.

[dkoch]

I would hope any framer worth his/her paycheck could divide any given length into any given number of equal parts without the need to measure each one. The variance allowed by most codes accounts for the fact that the products of human labor are not going to be perfect.

Be all that as it may be, I would never design a stair with intentionally varying risers in a single run, to get the numbers to be easily measurable. I would divide the entire rise by the number of risers and put one dimension on the entire rise, with an indication of the number of equal risers. It is up to the fabricator to do her/his best to create equal risers, while staying within code-mandated tolerances.