https://community.graphisoft.com/t5/Modeling/Trim-to-roof-issue/m-p/227251#M122334 The building material for your roof needs to be stronger than the building materials used in the walls.<BR /> <BR /> Or do a Solid Element Operation instead of trim to roof.<BR /> <BR /> Barry. Thu, 08 Sep 2016 01:53:50 GMT Barry Kelly 2016-09-08T01:53:50Z https://community.graphisoft.com/t5/Modeling/Trim-to-roof-issue/m-p/227250#M122333 <DIV class="actalk-migrated-content"><T>Ive encountered this a few times and it doesnt always happen but im not sure what is going wrong when it does.<BR /> <BR /> Sometimes when I trim to roof the wall footprint is shown ontop of the roof?<BR /> <BR /> What am I doing wrong?<BR /> <BR /> Thanks</T></DIV><BR /><IMG src="http://community.graphisoft.com/t5/image/serverpage/image-id/75207iA8F0E6B1A52BD5CA/image-size/large?v=v2&amp;px=999" border="0" alt="roof-issue.jpg" title="roof-issue.jpg" /> Tue, 23 May 2023 12:20:42 GMT https://community.graphisoft.com/t5/Modeling/Trim-to-roof-issue/m-p/227250#M122333 Anonymous 2023-05-23T12:20:42Z https://community.graphisoft.com/t5/Modeling/Trim-to-roof-issue/m-p/227251#M122334 The building material for your roof needs to be stronger than the building materials used in the walls.<BR /> <BR /> Or do a Solid Element Operation instead of trim to roof.<BR /> <BR /> Barry. Thu, 08 Sep 2016 01:53:50 GMT https://community.graphisoft.com/t5/Modeling/Trim-to-roof-issue/m-p/227251#M122334 Barry Kelly 2016-09-08T01:53:50Z