FAQ 003067 EN

9 May 2019

Markus Baumgärtel Modeling | Structure RFEM

When creating a solid, I always get the message "Boundary surfaces are not closed at edges ..." What can I do?


It is often the case that one or more surfaces of the generated volume have double lines. In this case, the peripheral surfaces of the solid are not closed and the generation must be stopped. To find these lines quickly, the program displays a corresponding message.


You can quickly find double lines with the function "Tools → Model Check → Overlapping Lines". In this tool, you can also display the line pairs as an Excel list or create partial views (see highlighted buttons in Figure 02).

However, it is often the case that the lines can not be deleted easily because they are assigned to different objects. If you delete one of the lines, e.g. a surface will be deleted as well. It is therefore recommended to check for all structural components if the lines can be deleted and if the boundary lines should be adjusted.


Boundary surface Volume error Double line



Contact us

Contact to Dlubal

Did you find your question?
If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

+49 9673 9203 0


RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

Price of First License
3,540.00 USD