https://community.graphisoft.com/t5/Modeling/slab-and-wall-intersection/m-p/223297#M120601 Make sure that in the Options\Project Preferences\Legacy Dialog, the "Use legacy intersection and surface methods for model elements"checkbox is unchecked. Then Priority Based Connections will be created between intersecting elements and the intersection will be resolved between the Wall and the Slab.<BR /> I would use a Beam to create that beam situation below the Wall you are referring to. Mon, 12 Oct 2015 22:23:46 GMT Laszlo Nagy 2015-10-12T22:23:46Z https://community.graphisoft.com/t5/Modeling/slab-and-wall-intersection/m-p/223293#M120597 <DIV class="actalk-migrated-content"><T>using ac17, why do i see the finish line of the slab where the wall is? how can i change this!? <BR /> thankyou</T></DIV> Wed, 24 May 2023 06:46:52 GMT https://community.graphisoft.com/t5/Modeling/slab-and-wall-intersection/m-p/223293#M120597 Anonymous 2023-05-24T06:46:52Z https://community.graphisoft.com/t5/Modeling/slab-and-wall-intersection/m-p/223294#M120598 pic<BR /><IMG src="https://community.graphisoft.com/t5/image/serverpage/image-id/13012i1012910E7DAED176/image-size/large?v=v2&amp;px=999" border="0" alt="2.jpg" title="2.jpg" /> Sun, 11 Oct 2015 07:50:41 GMT https://community.graphisoft.com/t5/Modeling/slab-and-wall-intersection/m-p/223294#M120598 Anonymous 2015-10-11T07:50:41Z https://community.graphisoft.com/t5/Modeling/slab-and-wall-intersection/m-p/223295#M120599 another problem using slabs- can i do someting so that the slab's core will replace the slab's finish under the wall? Sun, 11 Oct 2015 07:55:30 GMT https://community.graphisoft.com/t5/Modeling/slab-and-wall-intersection/m-p/223295#M120599 Anonymous 2015-10-11T07:55:30Z https://community.graphisoft.com/t5/Modeling/slab-and-wall-intersection/m-p/223296#M120600 Your wall should be standing on the core, not on the finish.<BR /> If you have a 50 mm finish you shoud offset your wall at buttom with -50 mm.<BR /> <BR /> <IMG src="http://nees64.home.xs4all.nl/archicad/slab2.jpg" /><BR /> Left wall has an offset of -50 mm, right wall has no offset. Sun, 11 Oct 2015 08:54:53 GMT https://community.graphisoft.com/t5/Modeling/slab-and-wall-intersection/m-p/223296#M120600 Dontknow 2015-10-11T08:54:53Z https://community.graphisoft.com/t5/Modeling/slab-and-wall-intersection/m-p/223297#M120601 Make sure that in the Options\Project Preferences\Legacy Dialog, the "Use legacy intersection and surface methods for model elements"checkbox is unchecked. Then Priority Based Connections will be created between intersecting elements and the intersection will be resolved between the Wall and the Slab.<BR /> I would use a Beam to create that beam situation below the Wall you are referring to. Mon, 12 Oct 2015 22:23:46 GMT https://community.graphisoft.com/t5/Modeling/slab-and-wall-intersection/m-p/223297#M120601 Laszlo Nagy 2015-10-12T22:23:46Z