Controlling what cuts what?

[patricks]

I have a wall and a flat roof. The roof extends to the outer face of the wall, and I have the outer layers of the wall unlocked and extended up part-way into the roof. Now I want to join them and have the wall cut away part of the roof that overlaps. However no matter what order I pick the wall and roof, the roof always cuts the wall. Is there any way to make the wall cut the roof?

[Firmso]

I have a wall and a flat roof. The roof extends to the outer face of the wall, and I have the outer layers of the wall unlocked and extended up part-way into the roof. Now I want to join them and have the wall cut away part of the roof that overlaps. However no matter what order I pick the wall and roof, the roof always cuts the wall. Is there any way to make the wall cut the roof?

I don't think that is possible because in actual construction, the wall always supports the roof.
Therefore it would be logical to have to edit the roof to go around the wall to achieve that result. if the roof attaches to the wall then you may need to add the beam into the wall to connect the roof.
However, if it was out of curiuosity you are inquiring about this, then my answer would be no. There isn't a way.

[cphubb]

What you are probably seeing is when you join or attach Revit attaches core layers to core layers and non-core to non-core based on the index number of the layer. Check that out.

[aaronrumple]

This is one of those things Revit should change. In the image below you want to remove the roof from where the two objects overlap to for a bird's mouth. Can't be done with the join command. The roof will always slice off the top of the wall.

Preferably the cut tool would be enhanced to take care of this situation.

[ejburrell67787]

This is one of those things Revit should change. In the image below you want to remove the roof from where the two objects overlap to for a bird's mouth. Can't be done with the join command. The roof will always slice off the top of the wall.

Preferably the cut tool would be enhanced to take care of this situation.You can make it look right in section or detail buy using the Edit Cut Profile tool though. (extra work I know!)

[patricks]

You can make it look right in section or detail buy using the Edit Cut Profile tool though. (extra work I know!)

Ah yes I always forget about that. Would be nice if it were more than just view-specific, though.

The reason I want to do this is because my roof type consists of metal deck, polyiso insulation, and roof membrane layers; while the wall consists of metal studs, sheathing, and EIFS. I'm going to have separate structure elements (bar joists and columns and beams), but I wanted to extend the sheathing and EIFS up under the polyiso layer, and have it cut away the metal deck layer (so the metal deck extends out to face of stud, while the polyiso would go out to outer finish face of EIFS). In my detail I will actually have wood blocking at the edge of the polyiso layer with the roof membrane and metal trim flashing extending over the wood blocking and down in front of the EIFS.

[eric.198284]

Wall always supports roof...

That's not necessarily true. A cripple wall that sits on a bearing wall could attach to a roof that is supported by a truss that also sits on the bearing wall. I'm having trouble with trims as well and the limited control. It seems like many 'ALWAYS' assumptions gets in the way of decent drafting in Revit.