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Joining two roofs problem

Hello! I want to join two single-plane roofs. I know that I have to use the CTRL command but everytime I press CTRL it turns into a scissor. I don't know what I don't do right. Can anybody explain me the steps for connecting them?
ArchiCAD 17 64-bit | Win 7


Make sure the Roof Tool is selected in the Toolbar, and one of the roofs is selected before holding down the Command (Mac) key.

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David Maudlin / Architect
Digital Architecture
AC24 USA • iMac 27" 4.0GHz Quad-core i7 | 24 gb ram • MacBook Pro 2.8GHz | 16 gb ram • OSX10.14.6

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