topic Re: Wall corner connection issue with two angled walls in Revit API Forum

Wall corner connection issue with two angled walls

F_Bgdh — Tue, 02 Sep 2025 14:46:38 GMT

Hello everyone,

I am trying to create a wall that forms an angle. Since I couldn’t achieve it directly, I tried to model it using two separate walls. However, the problem is that these two walls remain separated and do not join at the corner, as shown in the attached image.

Is there any way in the Revit API to properly join two angled walls so that they form a continuous corner without gaps?

Thank you in advance for your help.

Re: Wall corner connection issue with two angled walls

Charles.Piro — Sat, 30 Aug 2025 09:17:33 GMT

Hi,

first question ! Do you have the same endpoint for the two walls to be joined ?

😉

Re: Wall corner connection issue with two angled walls

F_Bgdh — Sat, 30 Aug 2025 22:35:42 GMT

hi
The short wall’s endpoint is the starting point of the long wall

Re: Wall corner connection issue with two angled walls

Charles.Piro — Sun, 31 Aug 2025 08:40:22 GMT

Hi,

I think , to start, you need to check if the jonction is allowed. Here is the code to check that :

//0 is the index of the endpoint bool IsAllowJoin1 = WallUtils.IsWallJoinAllowedAtEnd(wallElement1, 0) bool IsAllowJoin2 = WallUtils.IsWallJoinAllowedAtEnd(wallElement2, 0)

After, if the join isn't allowed, you can permit it for both elements :

//0 is the index of the endpoint WallUtils.AllowWallJoinAtEnd(wallElement1, 0); WallUtils.AllowWallJoinAtEnd(wallElement2, 0);

If the result isn't good, you can try attaching the geometries :

JoinGeometryUtils.JoinGeometry(doc, wallElement1, wallElement2);

😉

Re: Wall corner connection issue with two angled walls

F_Bgdh — Mon, 01 Sep 2025 10:51:43 GMT

Hi,

I tried the solution you suggested. It does work, but the two walls are still not properly joined.

Re: Wall corner connection issue with two angled walls

Charles.Piro — Mon, 01 Sep 2025 10:56:45 GMT

Hi,

thank you for your feedback.

Inside Revit UI, when you tried to join them using this function :

what is the result ?

😉

Re: Wall corner connection issue with two angled walls

F_Bgdh — Mon, 01 Sep 2025 11:19:12 GMT

Hi,

When I try to join the two walls with the Revit functions, they don’t join correctly — it only works if I extend the walls manually, or if I create reference planes to align their endpoints.

Another important point: I need to disable all wall joins in the project, otherwise the model becomes incorrect. That’s why I created a method to allow the join only for these two specific walls.

Re: Wall corner connection issue with two angled walls

Charles.Piro — Mon, 01 Sep 2025 11:48:20 GMT

Hi,

can you share part of your Revit project with 2 unjoined walls ?

😉

Re: Wall corner connection issue with two angled walls

F_Bgdh — Mon, 01 Sep 2025 13:25:48 GMT

Re: Wall corner connection issue with two angled walls

Charles.Piro — Mon, 01 Sep 2025 13:30:50 GMT

Hi,

Sorry if I wasn't clear. I was thinking of an attached Revit file !

😉

Re: Wall corner connection issue with two angled walls

F_Bgdh — Mon, 01 Sep 2025 13:54:21 GMT

Re: Wall corner connection issue with two angled walls

Charles.Piro — Mon, 01 Sep 2025 13:48:34 GMT

Just with problematic walls. 😉

Re: Wall corner connection issue with two angled walls

F_Bgdh — Mon, 01 Sep 2025 13:54:02 GMT

hi,

Re: Wall corner connection issue with two angled walls

Charles.Piro — Mon, 01 Sep 2025 14:38:50 GMT

Hi,

thank you for the file. The problem is your Updater whose disallow the junctions. Without it, I can join the walls manually and programmatically :

I think the best way is to exclude these elements from your Updater using a specific static list.

😉

Re: Wall corner connection issue with two angled walls

F_Bgdh — Mon, 01 Sep 2025 14:44:33 GMT

Thank you for your explanation. I’m not sure I fully understand your solution.

Could you clarify what you mean by excluding these elements from the Updater using a specific static list?

Do you mean I should create a list of walls that the Updater will ignore?
How exactly should I implement this in my project so that only these walls can join while other walls remain unaffected?

Thanks a lot for your help

Re: Wall corner connection issue with two angled walls

F_Bgdh — Mon, 01 Sep 2025 16:48:12 GMT

I tried your solution, but now I face a new issue: there is a height misalignment between wall1 and wall2. Here are two views: one in plan, and another one showing the vertical offset.

Re: Wall corner connection issue with two angled walls

kamaluddin.shaikh9 — Tue, 02 Sep 2025 03:19:53 GMT

Use wall join command from modify tab and make it miter join

Re: Wall corner connection issue with two angled walls

F_Bgdh — Tue, 02 Sep 2025 09:07:31 GMT

hi @kamaluddin.shaikh9,

I previously solved the issue by re-enabling the wall join for the two walls specifically, but that caused a vertical offset between wall1 and wall2.

Now with your solution (using Wall Join → Miter), should I apply it alone instead of my previous solution, or should it be combined with the previous fix?

Re: Wall corner connection issue with two angled walls

F_Bgdh — Tue, 02 Sep 2025 14:45:19 GMT

@kamaluddin.shaikh9 @Charles.Piro the Wall Join → Miter Join from the Modify tab in Revit. I wanted to ask: is it possible to reproduce the exact same Miter Join behavior programmatically using the Revit 2024 API?

Can this be done directly after wall creation, or do we need to implement a custom method to simulate it?

Re: Wall corner connection issue with two angled walls

F_Bgdh — Tue, 02 Sep 2025 16:31:42 GMT

I tested the Wall Join → Miter Join method manually, but the walls are not joining correctly.