Simple composite WALL-FLOOR intersection

[stefan]

When two composite entities (wall and a slab) intersect, how do you get a correct cleanup?

I can set the priorities of the individual layers, defining the core of the slab to have priority over the core of the wall. But some lines of the wall continue and the non-core part of the slab (with lower priority) still pierces through the wall's core with higher priority.

[Erika Epstein]

In the Help it says:

"Skin Priority: Assign a skin priority to the selected skin which will affect its 2D intersection appearance in the project. This Skin Priority is relevant only if the current Composite Structure is used as a wall"

so skin priorities don't have effect with slabs.

Good wish item.

[Aussie John]

yes it is a good wish item - I'll vote if you post.
Now that walls can extend over multiple storeys this is more important than previously.

[Petros Ioannou]

A solution is to use 2 different slabs.
One for the concrete floor (S-Floor layer-single fill slab)
and another one for the floor cover (A-Floor layer - composite skin) which can change without affecting the structure of the building.

I think it is a better way because in most cases you have a single concrete slab for the whole floor but different floor finishes in different rooms (WC, corridors,Bedrooms etc).

HTH
Petros

[stefan]

I know I can fix it with split floors, but that beats the point of composite slabs largely. But it comes closer to how you should build.

I want to avoid Solid Element Operations in this case, since this is so common that I fear that they start to destabilize. I still avoid SEO unless they are "special occasions" and can easily be managed. The use of SEO lacks a project-wide overview. You have to know each and every one that you've created. They can not easily be retrieved.

I saw exactly this in a Revit demonstration and then started to realize that ArchiCAD cannot solve this easily.

Splitting floors is probably the cleanest solution, within the concept of the virtual building. In fact, the few ArchiCADders I regulary meet often split constructive elements (walls and floors), but I want to avoid it, certainly with walls, where this causes so much more effort to get the windows and doors correct.

[Anonymous]

Hello Stefan,
I am a new user of AC. I've got same problem. I was nearly crying I solve it in this way:
I gave slab's background fill white color ( not transparent). Then i adjust its display order . (send to back,front etc..)
I hope it's the solution for you

[Anonymous]

The cleanest workaround (for me) is:

- Take the composite slab only to the inner face of the wall.
- Make a beam with the same height than your slab, and position it against said slab, inside wall.
- with the new composite beams, you can even have many layers of floor 'entering' the slab.
- Group your beam with the outer wall, so it won't get misplaced.
- As the beam subtracts from the wall volume, you get correct quantities.

[Anonymous]

Krippahl wrote:
The cleanest workaround (for me) is:

- Take the composite slab only to the inner face of the wall.
- Make a beam with the same height than your slab, and position it against said slab, inside wall.
- with the new composite beams, you can even have many layers of floor 'entering' the slab.
- Group your beam with the outer wall, so it won't get misplaced.
- As the beam subtracts from the wall volume, you get correct quantities.

Surely this will result in a line between the beam and the slab which would not look right in section?

Weve been trying to figure this floor wall junction problem out as well. I cant believe that composite walls and slabs dont work automatically! Whats the point in them otherwise. This is where I start to really lose faith in AC when even the most basic of junctions doesnt work.

We had a toturial recently where the AC specialist said you have to split the screed and the slab and that the best way to get complex junctions to work is to use fills over the top to 'tidy up the messy lines etc'. Why doesnt this program do what its supposed to? Its supposed to create a 3d model which can then produce all the sections and elevs.

But has anybody actually ever done this without resorting to cheating fills etc? If so I would be really interested to hear how.

[stefan]

If Scott is reading this, he will smile and tell us that Revit does this cleanly...

I'm disappointed that I have to use tricks to solve this. I guess it's a result of the ability to break out of the "single wall on a single story" concept from before...

[SeaGeoff]

The second class nature of composites (along with a lot of other things) in S/E is one of the true failings of ArchiCAD. This slab-wall situation has been the point of complaint for years. Even so, make this a poll since it's Essential. Problem is there are so many essential things out there (e.g. the renewed call for decent stairs) that I don't know how Graphisoft will ever catch up.