This 24 minute ArchiCAD training lesson explores the methods that may be used to connect roofs to each other, focusing on adding a gable extension to a simple hip roof system.
The lesson is conducted using ArchiCAD 14, and it applies directly to earlier versions as well. In ArchiCAD 15 and later, roof construction has changed and we will cover this in the next lesson; however there are times even in later versions that the methods shown here may be necessary, due to the limitations in the newer multi-plane roof tool.
After a basic rectangular building is drawn with a hip roof, a gable extension is created. Using the Command-click or CTRL-click method, roof edges are quickly repositioned to the location where they will meet the selected roof. Quick manipulations create overhangs and trim the walls to the roofs using Solid Element Operations, and the gable extension is completed.
One variation is made: the slope of the gable is changed. The roof edges need to be repositioned, which is done by selecting the main roof and Command or CTRL-clicking on the valley edges of the gable; the cutout for the main roof, as well as the extents of the overhangs, also need manual adjustment.
The slope changes are reversed using the Undo command multiple times, then the gable extension is duplicated twice, each time with a different pivot line height. First the version with a higher plate is cleaned up, then the one with the lower pivot line. In each case, a combination of manipulations is able to clean up the roofs to each other and set the walls properly.
Two final demonstrations are made showing how the gable extension can be moved in line with the hip at one end, and the hip roof contour polygon can be adjusted to include what formerly was an independent gable piece.
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