Railing Height Baselevel Offset on Stairs

[Anonymous]

I have a problem with Revit's railling location rule for stairs.

The program's default rule establishes that the height of railing elements will be measured by the base level of the railling. When placed on stairs, this corresponds to the level of each tread, aligned by the riser line, as shown in the following image:

The problem begins when one has to adapt this rule to the brazilian accessibility standard rule, for example, which establishes that the handrail height should be measured by the middle of the tread:

I know that there is no option for this kind of alternative natively in Revit. I do know that rainlings have an instance parameter that could quickly workaround this: Baselevel Offset. But it is not available for stair hosted railings:

Alternatives for resolution seem quite painful. I figured out I could adjust the height of elements inside the railing sketch – which means editing many, many lines...–, or creating specific families for different stairs – as different riser/tread relations may require. It looks just wrong to create nearly identical families with small height adjustments. That would pave roads for many mistakes.

I'm I missing some important feature?

[Ilic.Andrej]

You can try and use Dynamo to define railing height values. It could be based on this math:

Height = Height by Brazilian Standard Rule - (Riser Height/2)

... so "Height by Brazilian Standard Rule" and "Riser Height" could be some project parameters you add to the railing category, which then you can use to manipulate the built-in parameter "Height"...

...Or you could just do the math yourself, you could create a global parameter calculator that can help you get the result. So for example, "Height by Brazilian Standard Rule" , "Riser Height" and "Railing Height" are all global parameters where "Railing Height" has this formula assigned to it. You just copy the result and define the height of the railing...

[nikhil.kumar.d.shah]

@Anonymous 

I was thinking that the tread would be flat, and therefore the same elevation at the riser line or at the middle of the tread. However from the pictures I can see that there would be a small difference in height due to the slope of the stairs/railing.

It seems like this difference would be measurable and constant. I.e., they should be able to calculate the value they need to set for the height at the riser line so that they would get the right height at the center of the tread.