Wishes forum
Showing results for 
Search instead for 
Did you mean: 

Roof Tool Negative Pitch - for Drainage Plan Floors




If it would be possible to use the roof tool with a negative pitch, modelling floor elements for drainage plans would be so easy. 




Thank you:)


Just split to single plane roofs and flip the pivot line.

Erwin Edel, Project Lead, Leloup Architecten

ArchiCAD 9-24 NED FULL
Windows 10 Pro
Adobe Design Premium CS5


It is possible. Just mirror each roof segment, so the pitch mark for each segment will be in the middle. You'd need to use the single plane geometry method for that.

For solid structures with a leveled bottom side the mesh tool is a better choice.

Archicad 4.55 - 24 | HP Z800 | Dual Xeon X5667 | 48 GB RAM | Nvidia Quadro P1000 @ Windows 10 Pro x64


I know it is possible, its just that with a minor change to the tool like this, a lot of time would be saved. Also if there ever is a change to the drainage-plan and some drains have to be relocated -- you would have to change every roof element and adjust them to the new plan. When were working on large projects, this can take quite a while to do.

May be you can develop such element in Param-O easily, so can get repeated or modified easily as when needed.




Construct required roof in shape of expected drainage element with its apex towards +ve Z axis. Convert the roof into Morph. Later rotate the morph to get the drainage element upside down.

Rajesh Patil
AC 09-25 | INT | WIN10 64
Dell Inspiron 7591, Core i9, 9880H 2.30GHz, 16.0GB, NVidia GeForce GTX1650, 4.0GB, SSD Internal 500GB, Dell SSD External 250GB


Using the mesh tool could also be an option for modelling drainage, in my opinion it depends on the situation which one is easier to use.

actively using: AC22-25 INT | Rhino6-7 | macOS / win10


Just use single-plane roofs, which you will need to in any case as soon the model gets past the very first rough sketch. Screen Shot 2021-09-24 at 1.01.29 PM.png

Vasileios S_

Can we just stick to the wish that Jensth made? He wants a roof with negative pitch, I want that too.

Still looking?

Browse more topics

Back to forum

See latest solutions

Accepted solutions

Start a new discussion!