https://community.graphisoft.com/t5/Modeling/Internal-wall-goes-into-exterior-wall/m-p/259014#M170251 Hello,<BR /> <BR /> You have used a material which is intended to be used for thermal insulation from the outside of the building.<BR /> Did you try to select these two walls and then go to the material library to check all their material priority ?<BR /> <BR /> I advise you to duplicate the material you want to modify instead of modify the original material. Sat, 28 Sep 2019 19:56:34 GMT Christophe Fortineau 2019-09-28T19:56:34Z https://community.graphisoft.com/t5/Modeling/Internal-wall-goes-into-exterior-wall/m-p/259013#M170250 <DIV class="actalk-migrated-content">Hi People,<BR />I am learning ArchiCAD at school and doing assignment at home. The interior wall I drew goes cross and goes on top of the exterior wall, I have clicked on the inside line of exterior wall but it starches to the outside line. Does anyone know how to fix this?<BR />Thanks <BR />Johnny<IMG border="0" /><S><IMG src="&lt;/s&gt;&lt;e&gt;" border="0" /></S></DIV> Wed, 31 Jan 2024 12:41:43 GMT https://community.graphisoft.com/t5/Modeling/Internal-wall-goes-into-exterior-wall/m-p/259013#M170250 Anonymous 2024-01-31T12:41:43Z https://community.graphisoft.com/t5/Modeling/Internal-wall-goes-into-exterior-wall/m-p/259014#M170251 Hello,<BR /> <BR /> You have used a material which is intended to be used for thermal insulation from the outside of the building.<BR /> Did you try to select these two walls and then go to the material library to check all their material priority ?<BR /> <BR /> I advise you to duplicate the material you want to modify instead of modify the original material. Sat, 28 Sep 2019 19:56:34 GMT https://community.graphisoft.com/t5/Modeling/Internal-wall-goes-into-exterior-wall/m-p/259014#M170251 Christophe Fortineau 2019-09-28T19:56:34Z