i cant add roofs on my RCT3 buildings

[threeyoda]

when i go to put roofs on the buildings they stay on the ground, and dont go ontop of the building. Is there somthing you do to put it ontop of the building?

[Manny In England]

To raise and lower any object, building or coaster hold down shift and use the mouse.

[Steffen_Dk]

^ The manual says it pretty clear

[mcjaco]

The Shift key also properly capitalizes.