Slab edge on sloped slab gives error "can't cut joined element

[mjmcdoDPLV5]

i created a 5" thick slab and a 2'x2' footing with a chamfer. 

i slope the slab and then try to add the edge. it doesn't add on the sloped sides.

i flatten the slab and add the edge to all sides. then i attempt to add slope using slope arrow. get can't cut joined elements

i flatten slab and add edges, join geometry, attempt to add slope, same error

i flatten slab, add edges, slope slab, get error, finish, then attempt to join geometry, get same error..

how can this work? it seems like it should be simple....

[martijn_pater]

You can always model the edge in-place.

[barthbradley]

That is typical behavior.  

Slab Edge Profile place on Sloped Slab via In-Place Component Sweep:

[RDAOU]

You can place the Slab Edge on a sloped slab...First place the edge Then edit the slab and add the desired slope to it.

[mjmcdoDPLV5]

if i only put on sloped sides it works. it doesn't work when you put on all four sides.

[RDAOU]

Works on all 4 sides … I'm using 2020.2

[barthbradley]

HEY @RDAOU !  Long time, no see!  How's it hanging?  

...regarding the resulting slab edge by doing the way you are; it's not contiguous to the bottom of the slab.  It might be "close enough", but I don't know why, by now, Revit can't get it "dead on ballz accurate" -- especially since doing it as an In-Place sweep using the same Profile is DOBA.    

[mjmcdoDPLV5]

it works as an in-place sweep. it doesn't work as  a slab edge with a 2'x2' chamfered  profile

[ToanDN]

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@barthbradley wrote:

HEY @RDAOU !  Long time, no see!  How's it hanging?  

...regarding the resulting slab edge by doing the way you are; it's not contiguous to the bottom of the slab.  It might be "close enough", but I don't know why, by now, Revit can't get it "dead on ballz accurate" -- especially since doing it as an In-Place sweep using the same Profile is DOBA.    

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Because the in place approach creates a single sweep geometry and the slab edge approach creates 4 pieces (I see them more of swept blends than sweeps).

[ToanDN]

Here is as clean as I can get using slab edges.

[RDAOU]

Hey @barthbradley  @ToanDN 🙂

Hey Barth/T

In-place sweeps and blends are heavy and tedious...I would rather go with a slab edge (better a roof element with facia) and set a different profile at the highest and lowest edge of the slab/roof to compensate the slope.

[RDAOU]

@ToanDN  it should be seamless …  tweak the profile by adding an angle parameter and u get the result below

works for both "floor with slab edge" or "roof with facia"

[martijn_pater · Accepted solution]

I still prefer an in-place sweep for accuracy, the example above is a workaround also. But I suppose you are right that it also depends on the number of edges in the project.