Concrete Steps

Revit doesn't seem to like generating a smooth underside for some stair configurations. A post at AUGI asked about making what seems like simple concrete steps. Yes, they do look simple. The stair (and railing) features sure have a lot of buttons, dialogs and subtlety. There is definitely no easy button unless you are satisfied with whatever the stair looks like after you place two points to create a straight stair. This is the image that the original post included at AUGI.

Years ago I picked on Autodesk because the stair and railing features couldn't easily be used to make the stair in their building's own ground floor atrium/foyer. They've moved since and there aren't any featured stairs now. Coincidence? [evil grin]

Revit doesn't mind creating the steps if we choose the "Stepped" option.

This is what the sketch looks like.

Keep in mind that the "end" of a stair like this needs a riser not a boundary sketch segment. That's why the sketch line at the top of the steps is black, not green. Creating a stair that ends at a landing can be a bit counter-intuitive, I wrote a post about that condition some years ago too, it's called "A Flat Slope".

A little bit later I was doing something with a floor slab edge and it occurred to me that I could use a slab edge profile to create the steps too. So this is the result of a profile family applied to a Slab Edge type and then applied to three sides of the floor edge. I made the top step the floor so I'd have three edges to work with. If I wanted a joint between the floor slab and the step I could just make the top step a floor and create another floor behind it for the building's floor slab.

Here's the section through the steps and floor (on the left) and the profile family in the family editor (on the right).

The section of the step profile shows that it extends under the slab. I did that so I could use Join Geometry between them and clean up the lines between them. Assigning the same material to the Slab Edge type means that the concrete pattern flows between them nicely. The view from below the steps reveals the nice sloped slab edge that results from the slab edge profile. Compare that against the stepped version and this one looks more realistic from a construction perspective.

Now all I need to finish it off is a short foundation wall to close up the space behind the steps and the edge of slab. Something to consider for those little steps you need for your next project.

Color Fill Legends Mixing with Stairs and Railings

David Light wrote a post about getting stairs to display better when color fill legends are involved. Then Brian Mackey wrote a post to offer another solution. David's approach involves using a solid fill and matching color to "blend" the color fill and the solid fill colors. Brian's involves using the new "Ghost Surfaces" feature.

To offer my two cents I wrote a comment to David's post after reading his. I mentioned what happens when we use the "Transparent" option for categories in Visibility/Graphics or using Override Graphics in View feature > By Element.

This is what you see on screen (using the "Transparent" option to "Override Graphics in View > By Element")(uh oh):

And this is what you get when you print (oh? okay):

Intrigued because I didn't bother to try the approach Brian suggested, I tried it. Using the "Ghost Surfaces" option to "Override Graphics in View > By Element" you see this on screen (looking good):

This is what you get when you print (oh, not so good):

Tag...you guys are "it"! :)

Stair Headroom Clearance

In the past I've written about using a line based family to document path of egress information. Brian Mackey with BD Mackey Consulting in Denver recently shared a concept he uses for demonstrating that a stair well has sufficient clearance. He uses a railing family that has a profile to document the required clearance instead of what we'd usually use. In this example I quickly mocked up I just used a similar "guy" I'm calling Clarence, so Clarence can show the Clearance is met.

It's easy! Just create a profile family and load it into your project. Assign the profile to a new railing type, called Clearance. Assign Clarence to the Railing. Place the railing on the center line of the stair. You'll have to fuss with graphics and decide when it should be visible but it's pretty simple. To really show the zone required for clearance a simple rectangular profile off a specified height would suffice and show where no building elements should touch. A quick interference check would help catch problems too.

Cool solution Brian!

Stairs by Sketch and Worksets

I've written about this a couple times in the past. Hanging around with a serious Revit guru tonight I was surprised that he wasn't aware of the issue. He'd encountered it but had not sorted out the cause. The previous posts are THIS ONE and THIS OTHER ONE.

The essence of the problem is how the sketch is created in a workset enabled project. If you create individual segments so the stringers are formed properly Revit complains about having "two boundaries".

If you sketch segments that will not generate stringers correctly the stair will finish but generate another error. If you immediately edit the sketch and use the Split tool to break up the segment it then works properly.

Do the same thing in a stand alone project file and no problem. This is ages old but for some reason it only showed up on the radar when I submitted the issue back in 2007. Still with us today, go figure! Hey for those of you out there that I tried to blame it as "user error", sorry bout that! :) An apology is better late than never...