topic Re: Gable Roof with non Parallel Walls in Modeling

Gable Roof with non Parallel Walls

Anonymous — Tue, 23 May 2023 12:16:50 GMT

Hi!

I have a problem with drawing a gable roof on a building with non parallel walls.
I draw the roof as a single plane roof.
Afterwards I connect them in the 3D window by clicking 1 plane, press the cmd-button (Apple user) and click the edge of the other plane.
I repeat this with the second roof plane. They connect perfectly.
The only thing is that the ridge is not 'straight', because of the non parallel walls.

Is there any solution? I've tried and tried many.
I've had contact with KUBUS. A helpdesk for ArchiCAD users in Belgium and the Netherlands. But even they could not help.

I hope someone of you can!
Many thanks in advance!

Re: Gable Roof with non Parallel Walls

Anonymous — Sat, 22 Jul 2017 16:00:45 GMT

Could someone please help me?
I am completely new on this forum.

We have a very strict deadline for this project.
I've tried and searched on every website possible!
Maybe there's just no solution for this?

However. Within our office we renovate many buildings in the city of Antwerp where the front and back elevation are not parallel and with a gable roof.
It's a common problem. .
I can't imagine ArchiCAD can not draw those roofs correctly. .

Many, many thanks!

Re: Gable Roof with non Parallel Walls

Dave Seabury — Sat, 22 Jul 2017 19:01:49 GMT

Kiliand

If you want the ridge to be level start with your single plane roof on the
wall that is not angled (top of your drawing). Mirror this as a copy to the
other side of the building and join them as you have been doing. Now you
will need to adjust the eave to be parallel with the angled wall. The eave will now have the angle to it, not the ridge.

David

Re: Gable Roof with non Parallel Walls

Anonymous — Sat, 22 Jul 2017 19:18:59 GMT

Dave Seabury,

In the first place, thanks a lot for the response!
I've tried this already.
Than the problem moves to the wall instead of the ridge.

I guess it's impossible to create a gable roof with a 'straight' ridge on a construction with non parallel walls?

Thanks again!

Re: Gable Roof with non Parallel Walls

Brett Brown — Sat, 22 Jul 2017 23:56:08 GMT

Read this thread, might be what you want
http://archicad-talk.graphisoft.com/viewtopic.php?p=264569&highlight=mesh+roof+tool#264569

Re: Gable Roof with non Parallel Walls

Anonymous — Sun, 23 Jul 2017 09:03:00 GMT

Brett Brown,

Thanks a lot! But still, I'm not able to create the roof as it needs to be.
I also never used the Shell Tool in ArchiCAD before.
I guess if it's that complex to create that kind of roof, it just won't work and I need to take peace with the roof ArchiCAD generates by using the cmd-button.

On the picture you can see the building I'm drawing.
It's bingmaps, so it's not that clear.

Maybe there's still someone reading this that hopefully knows a simple solution.

Thanks again, Brett!

Kilian

Re: Gable Roof with non Parallel Walls

DGSketcher — Sun, 23 Jul 2017 21:31:18 GMT

I don't see the problem. There are only two solution using single plane roofs:

1. The ridge is parallel to one of the eaves and level, with the other eaves having a sloped wall top.
2. Both eaves are level and the ridge slopes down to the narrow gable.

From your comments I assume you want the latter. To do this draw your first roof parallel to the first eaves, then repeat parallel with the second eaves. You can then intersect the two roofs like this...
https://helpcenter.graphisoft.com/guides/archicad-21/archicad-21-reference-guide/elements-of-the-virtual-building/construction-elements/roofs/editing-roofs/intersect-single-plane-roofs/

Simples?

Re: Gable Roof with non Parallel Walls

felcunha — Mon, 24 Jul 2017 09:08:12 GMT

I think that your roof makes a ruled surface: the edges are not parallels.
You can't create a ruled surface with the roof tool... I suggest you to try using the shell.

Bon courage !

Re: Gable Roof with non Parallel Walls

Anonymous — Mon, 24 Jul 2017 16:09:21 GMT

I've drawn the single plane roof by using the Mesh Tool.
I installed an add-on so I could use the 'Create Roofs from Mesh' option.

In the end, I keep the roof with the ridge sloping down to the narrow gable, like DGSketcher said.

Thank you all for the replies!