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Modeling
About Archicad's design tools, element connections, modeling concepts, etc.

Flat Roof

Eman
Contributor
Hi guys,

I am really liking ArchiCad 😉

I have another little problem how to apply a flat roof? I can apply a slab easily but I cannot apply a flat roof with same method as the slab!

Thanks,
Eman / Draftsman
Works at an Architects Company using ArchiCad 21
Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz 3.19 GHz, 8.00 GB, 64-bit operating system, x64-based processor
9 REPLIES 9
Eduardo Rolon
Moderator
Flat roofs are done with slabs not with the roof tool.
Eduardo Rolón AIA NCARB
AC27 US/INT -> AC08

Macbook Pro M1 Max 64GB ram, OS X 10.XX latest
another Moderator

Eman
Contributor
Hi Ejrolon

Hmmmm OK thanks very much
Eman / Draftsman
Works at an Architects Company using ArchiCad 21
Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz 3.19 GHz, 8.00 GB, 64-bit operating system, x64-based processor
Szabolcs Miko
Graphisoft
Graphisoft
That only means that you model them with the Slab tool. You can Classify them as Roofs though, in order to have it's property set.

Szabolcs Mikó

Education Program Manager

DGSketcher
Legend
Roofs can be drawn with positive or negative gradients which includes flat or 0 degrees.

Slabs are used where you do not need a slope e.g. floors
Apple iMac Intel i9 / macOS Sonoma / AC27UKI (most recent builds.. if they work)
Tim Ball
Expert
Flat roofs are not flat in regions that have rain. So use the roof tool with a shallow pitch
Tim Ball

AC26, iMac

User since V5
Eduardo Rolon
Moderator
But flat roofs are flat underneath so use the slab tool and if necessary use a mesh to get the rise as you need.
Eduardo Rolón AIA NCARB
AC27 US/INT -> AC08

Macbook Pro M1 Max 64GB ram, OS X 10.XX latest
another Moderator

DGSketcher
Legend
Eman - As you can see from the posts above, Archicad is a very flexible tool and there are many different ways to do things. Learn what the tools do first and then when you get stuck, the members of this very helpful community will hopefully point you in the right direction.
Apple iMac Intel i9 / macOS Sonoma / AC27UKI (most recent builds.. if they work)
Tim Ball
Expert
At working drawing stage I use a pitched roof for the covering and firrings zone, SEO cut by a slab below that is the actual roof structure and ceiling
Tim Ball

AC26, iMac

User since V5
Laszlo Nagy
Community Admin
Community Admin
Years ago I wrote an article about this for GRAPHISOFT. Here it is:

https://helpcenter.graphisoft.com/knowledgebase/25582/
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac27