A wall under a stair doesn’t have a flat top. It follows the stringer, and a Revit wall out of the box has no idea about that. Edit Profile is the tool for this. But the step people skip is the first one: getting a view where you can actually see what you’re about to cut.
Get a view where you can see under the stair
Two options. The first is a building section through the stair from the floor plan. In my file the section tags are hidden by the view template, so I used Reveal Hidden Elements to find it, flipped it so it’s looking the right direction, and double-clicked to open it. Now the underside of the stair is right there.
The second is a 3D view with a section box. Open the default 3D view, tick Section Box in Properties, and drag the box in until it slices through the building near the stair. I find the 3D view easier to read for this. Either way, don’t start sketching the profile until you can see the geometry you’re matching.
Draw the wall and leave it unconnected
Back on Level 1, Wall tool, draw along the edge of the stair from the bottom to where the wall should stop. Jump to the 3D view and it’s sticking up through the treads, which is expected.
Before editing the profile, set the Top Constraint to Unconnected and drop the Unconnected Height to something close to the real maximum, 9′-0″ here. I do this on every edited-profile wall. It keeps the wall from being tied to a level above, so if that level moves, the sketch doesn’t get dragged around with it.
Edit Profile with Pick Lines
Select the wall and click Edit Profile. Rather than drawing the slope by hand, use Pick Lines and click the underside of the stringer. Revit gives you the option to lock that line to the stair. I usually don’t. If the stair changes you’ll probably be in here fixing things anyway, and a locked line has a habit of throwing errors at the wrong moment.
Trim and finish
Now the sketch has the original rectangle plus a diagonal through it. Use Trim/Extend to Corner to join the diagonal to the vertical edges (or grab the line ends and drag them; either works). Delete the two leftover lines along the old top, so what’s left is the triangle under the stair. Green check, and the wall sits neatly against the stringer.
The same Edit Profile workflow handles sloped-ceiling walls, walls under a roof and the odd shapes around a landing. The only thing that changes is which line you pick.
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🔗 RESOURCES
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📐 Notion Business OS for Architects (free + paid templates): https://cpd.gumroad.com/l/civaw
📐 Free Notion Issue Tracker for Architects: https://cpd.gumroad.com/l/cjlls
🌐 More Revit tutorials: https://corbinteaches.com
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CHAPTERS
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0:00 The problem: a wall that follows the stair
0:21 Set up a section view
1:07 Or a 3D view with a section box
1:56 Draw the wall under the stair
2:30 Set an unconnected height
2:57 Edit Profile with Pick Lines
3:24 Trim, clean up and finish
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CONNECT
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