> For the complete documentation index, see [llms.txt](https://docs.dietrichs.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.dietrichs.com/dietrichs-intelligent-documentation/docs-de-en/design-program/modellbereiche/dach/dachflachenausfuhrung/verschneidung-der-decken-und-dachlagen.md).
# Intersection of Ceiling and Roof Layers
The layers of the ceiling and the roof surfaces intersect automatically with each other according to the following rules:
* We distinguish between visible and non-visible roof structures. A roof structure is not visible if there is a layer below layer 0 (rafters) with a thickness greater than 0.0.
* The core layers of the roof always continue through and are never limited.
* The core layers of the ceiling extend up to the layer that was set in the roof surface execution. This setting can be made differently for boundary ceilings and intermediate ceilings.
Visible roof structures:
* The shells of the ceiling extend up to the layer that was set in the roof surface execution. This setting can be made differently for boundary ceilings and intermediate ceilings.
Non-visible roof structures:
* The shells above the core layers of the ceiling end at the lowest shell of the roof.
* The lower shells of the ceiling end at the lowest shell of the roof.
* The lower shells of the roof end at the core layer of a boundary ceiling. For an intermediate ceiling, they are interrupted by the core layers of the ceiling.
For clarification, see the sketch below:
The core layers have been shaded gray.
## Roof execution:
Position
Core layer
Insulation
Formwork
Tiles
Kink layer
Boundary ceiling runs up to
-5
X
-4
X
-3
-2
X
-1
X
X
X
X
0
X
1
## Ceiling execution, boundary ceiling:
Position
Core layer
Insulation
-3
-2
X
-1
X
0
X
1
---
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