After naming my Garage room, the floor and ceiling height information changed. Why does this happen?
When Auto Rebuild Foundation is turned on, naming a room as Garage will cause changes to the way the foundation is built under that room.
First, begin with creating a basic example plan, where you will be using all of the default settings for Floor 1 floor and ceiling heights, and for building the foundation.
To create the basic plan
In a new plan file in floor plan view, select Build> Wall> Straight Exterior Wall , then click and drag out the walls to create a basic structure with attached garage, as shown in the image below.
Once the main building and garage room have been created, the foundation is automatically created with the default stem wall and footing heights.
If you foundation does not automatically generate click Build> Floor> Build Foundation and put a checkmark in Automatically Rebuild Foundation and click OK.
The floor and ceiling heights in the room that will be designated as the Garage, are still at the default for floor 1. The Floor Height is 0" and in our case, the Finished Ceiling Height is 107 5/8".
To verify this information, use the Select Objects tool to click on the smaller room, which will become the Garage, then click on the Open Object edit button.
In the Room Specification dialog, notice the values set on the Structure panel.
Next, select the General panel, and use the Room Type drop down menu to select Garage.
When the Room type is changed, the foundation is rebuilt to reflect these changes.
Return to the Structure panel after specifying the room as a Garage and notice the changes
The Stem Wall Top (C) Height value is added to the Absolute Elevations and is set to the height of the underside of the floor joists on floor 1. The floor is changed to a slab and the slab is lowered 12" below the top of the stem wall.
The Stem Wall (I) Height is set to 24".
Click OK to close the dialog for now.
Note: You may want to change the Stem Wall (I) height to meet your frost depth needs, however, before making any changes to the Structure settings in the Room Specification, you must first turn off Auto Rebuild Foundation.
To create a Full Overview
Select 3D> Create Camera View> Full Overview to generate a 3D image of the basic plan thus far.
Once you have seen how the plan has been created, select File> Close to close out of the camera view, returning you to floor plan view.
To turn off Auto Rebuild Foundation
Select Build> Floor> Build Foundation .
In the Build Foundation dialog, remove the checkmark next to Auto Rebuild Foundation, and click OK.
In the New Floor dialog, choose Derive new Foundation from the 1st Floor plan and click OK again.
Use the Select Objects tool to click on the Garage room, then click on the Open Object edit button to again display the Room Specification dialog.
On the Structure panel, observe that the Stem Wall height is set to 37 1/2" to match the stem wall created for the main house.
The slab remains in its original position, 12" below the top of the stem wall, but the footing is moved down to accommodate the increased stem wall height.
You can raise or lower the slab by modifying the Floor To SWT (H) value.
To create a 6" curb, or stem wall above the slab, set this value to 6".
Click OK to apply this change and close the dialog.
Finally, create another Full Overview to see the change.
Now that you understand this procedure, you can take the knowledge you have gained and apply it to your own designs.