https://community.graphisoft.com/t5/Modeling/SEO-on-W07-composite-wall-amp-stair-leaving-a-gypsum-wall/m-p/276214#M143385 This may be a bug. The behavior of those Wall skins is definitely suspect since all of them should be properly cut by the Stair Tread.<BR /> All I can suggest is that you make that Wall shorter in height so it extends upward only to the bottom of the Stair Tread, in which case it does not even have to be SEO-ed by the Stair Tread. Wed, 16 Jan 2019 12:45:54 GMT Laszlo Nagy 2019-01-16T12:45:54Z https://community.graphisoft.com/t5/Modeling/SEO-on-W07-composite-wall-amp-stair-leaving-a-gypsum-wall/m-p/276211#M143382 <DIV class="actalk-migrated-content"><T>Working in ArchiCad 22. Just installed library update 4030.57 today. Began work on an existing (very simple) project. Needed to trim a wall that goes under a stair. The wall is a standard library composite of gypsum, wood, gypsum (W07)... Tried to Subtract with Upward Extrusion with the wood stair as operator, but only 2 of the three wall materials trimmed so one surface of gypsum was left untouched. Since the wall composite is gypsum, wood, gypsum, and the stairs are all wood, and since both are standard ArchiCad library objects, I do not know why this SEO is malfunctioning nor how to fix it. I did try undo, save, try again... several times.</T></DIV> Wed, 24 May 2023 06:15:32 GMT https://community.graphisoft.com/t5/Modeling/SEO-on-W07-composite-wall-amp-stair-leaving-a-gypsum-wall/m-p/276211#M143382 Anonymous 2023-05-24T06:15:32Z https://community.graphisoft.com/t5/Modeling/SEO-on-W07-composite-wall-amp-stair-leaving-a-gypsum-wall/m-p/276212#M143383 Could you post a screenshot that shows the result of the SEO in 3D? Tue, 15 Jan 2019 12:18:53 GMT https://community.graphisoft.com/t5/Modeling/SEO-on-W07-composite-wall-amp-stair-leaving-a-gypsum-wall/m-p/276212#M143383 Laszlo Nagy 2019-01-15T12:18:53Z https://community.graphisoft.com/t5/Modeling/SEO-on-W07-composite-wall-amp-stair-leaving-a-gypsum-wall/m-p/276213#M143384 Certainly! It is attached.I've also attached another example of solid element operations failing on an adjacent wall that is under the same stair. This wall was executed with 'upward extrusion' and the wall became a segmented mess, leaving partial skins in a sequence... even though this is one simple 8' tall wall along the side/under of the stair. Thank you for any help you can provide!<BR /> <BR /> AC 22 after installation of library update 4030.57 Tue, 15 Jan 2019 17:16:22 GMT https://community.graphisoft.com/t5/Modeling/SEO-on-W07-composite-wall-amp-stair-leaving-a-gypsum-wall/m-p/276213#M143384 Anonymous 2019-01-15T17:16:22Z https://community.graphisoft.com/t5/Modeling/SEO-on-W07-composite-wall-amp-stair-leaving-a-gypsum-wall/m-p/276214#M143385 This may be a bug. The behavior of those Wall skins is definitely suspect since all of them should be properly cut by the Stair Tread.<BR /> All I can suggest is that you make that Wall shorter in height so it extends upward only to the bottom of the Stair Tread, in which case it does not even have to be SEO-ed by the Stair Tread. Wed, 16 Jan 2019 12:45:54 GMT https://community.graphisoft.com/t5/Modeling/SEO-on-W07-composite-wall-amp-stair-leaving-a-gypsum-wall/m-p/276214#M143385 Laszlo Nagy 2019-01-16T12:45:54Z