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Modelling and drafting in ARCHICAD. (Example: How can I model a Roof soffit/fascia?)

Moderators: Barry Kelly, Karl Ottenstein, LaszloNagy, ejrolon, gkmethy

By Einar Wahlstrøm
#273048
Hi.

I'm struggling with how to make a roof ridge that is not horizontal. I'm just beginning this BIM model and will naturally be working on it for the next 2-3 years so the solution has to be practical in terms of future skylight, sections...

What is the best way to approach this?
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screenshot.jpg
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By Erwin Edel
#273049
Unless the gutter is sloped as well or your building footprint is not a rectangle, you will have to bend or curve the roof planes to do that.

If you do want a sloped gutter or a trapezium footprint, the ridge will be sloped.

Build your model with cardboard and you will see how the roof planes work.
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By Erwin Edel
#273051
If you want to re-invent the rules of geometry, I'm not stopping you :wink:
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By Erwin Edel
#273054
Your roof pivot lines need to form a trapezium shape, that is the only way you will make that shape, without splitting that triangle in to two triangles or twisting the roof in to a curved shape.
By Einar Wahlstrøm
#273061
Thank you, both of you.

I was hoping there would be a solution where I could use the multi-plane roof, and easily adjust the angles as the project develop. It seems I have to use single-plane roofs, which is OK, but a bit more work...
Attachments
screenshot.jpg
By Stephen Dolbee
#273062
If your roof planes are not parallel with each other, your ridge will not be horizontal. It will slope up or down.
By Einar Wahlstrøm
#273063
Yes, the multi-plane does that...

Unfortunately the moment the footprint becomes something else than a rectangle the top ridge point is un-movable? That is very inconveniant at such an early stage...but probably because of geometry constraints.
Attachments
screenshot.jpg
Last edited by Einar Wahlstrøm on Mon Oct 16, 2017 6:19 pm, edited 1 time in total.