Roof, Ceilings, Shaft

Roof creation
1. Footprint

• Most common method
• Overhang = usually 500mm
• Everything is referenced back to the walls.
• 'Defines slope' should be ticked on, this defines the pitch
• Create gable by clicking on the wall where it should extend up, then click 'Attach Top/Base', then click on where you want the wall to extend up to eg. the edge of the roof.

NB. don't create flat roofs using 'Footprint', use the Floor tool instead as it's more flexible (see later)
NB. 5 degrees is the flattest slope

2. Extrusion
For sidings and vaulted roofs (ceiling = roof)
First set up reference planes for where you want the overhangs to be (eg. 500 out from the selected walls). Then it will ask you to 'pick a plane' so just click on an appropriate plane, then it will open in sketch view for you to sketch the profile of the roof...

NB. trimming the wall up to the roof using the 'Attach Top/Base' tool will not work if the roof goes around past 90 degrees (ie a crazy shape). The only way to do this is to edit the wall profile instead (see Waitangi day example).

Slopes:

• create normal roof then define slopes (option on ribbon)
• click on the lines you want to start the slope from
• > 4 degrees

Skylights
- Home, Vertical cut if cutting into an existing roof
- if adding a sloping roof that will be glazed, create roof as normal then choose 'sloped glazing' option in properties

Ceilings
These are added in a similar way to floors etc.
Exercise = adding a ceiling, then cutting a hole in it and placing a lowered ceiling over, eg. a reception desk. The hole is filled with walls which are joined = offsets, height offset from the level.

Shafts
This basically cuts a hole through floors and is much quicker if you have multiple floors than editing the footprint of the floor for each level when, eg. making lift wells/stair wells.

Remember the pick tool!