Join Roof to Wall

Video: Join Roof to a Wall

The join roof tool is typically used to extend the edge of one roof to the face of another roof, like you might see in a dormer condition, or where 2 separate roof elements have been created with 2 eave heights.  An aspect of the join roof tool often overlooked is the fact that it can also be used to join a roof to a wall.

When you use the join roof tool, first you need to select the roof edge to extend.  Once the edge is selected, note that the status bar says, “Select the face on another roof or WALL to which you want the first roof to be joined.”  The status bar is letting you know a wall face can be selected at this point.  You will also notice when you Hover over walls on the drawing window that they will highlight along with roof elements informing you that they can be selected.

Joining to a wall instead of a roof can be useful in a number of situations.  One example is in a “split gable” condition, which is a fairly common situation  When the roof tool is used to create a split gable roof in one sketch you will end up with a condition where the smaller of the 2 gables will “stop short” of the wall, leaving a portion of wall extending up to the larger gable.  Use the join roof tool and join the roof edge of the smaller gable to the wall extending into the larger gable to correct the geometry.

The other condition where joining a roof to a wall can be helpful, is the case in which the roof is a separate roof element and has an eave height lower than the roof you want to join with.  If you use the join tool and the lower roof is attached to the upper roof face, in many cases you will receive an error, and the geometry below the roof will not resolve as you would like. To avoid this problem, join the roof to the wall instead.  When the lower roof is joined to the wall, the roof extends to both the wall and the roof face above.