Geometry nodes - How to select edges along the Z axis

Hi everyone,

I’ve been working on a procedural house system and I have not been able to do this one simple thing.
When working on the roof I want to instance some tiles along the top edge, and later on the downward edges.

I’ve tried to isolate the edges capturing the normal atribute but I couldn’t make it work, I’ve also tried to use the edge vertices and edge angles but it all led to failure.

Does anyone have a clue how it should be done?
In the image is shown what I want to select first. I guess knowing how to do one will light the path to the other.

Thanks in advance.

You could use position in the z and edge verts node.

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