First of all: Sweet Home 3D is NOT CAD software. It was initially created as interior design software but has grown over the years to software with much more capabilities, but still it's not CAD software.
In other words: don't expect CAD concepts to apply in Sweet Home 3D.
Then walls. Walls are a special type of object in Sweet Home 3D with special properties to create and join them and to allow cutting holes with objects like doors and windows.
The fact that walls are measured using the center line is discussed a thousand times here and appears to resurface every two weeks or so
. In short: that's how they work in Sweet Home 3D and it won't change.Wall thickness is measured from the center line to the wall sides: a vertical wall 10cm thick and a X position 0 will have its left side at X -5 and its right side at x 5: a thickness of 10.
When you join walls in 90° angle the connection point will be where the two center lines of the walls connect: in the center of the connection. You will have to get used to this concept because it differs from how CAD software handles it.
Dorin created a great mini-manual here on the forum that shows several concepts on how to handle wall measurements: https://www.sweethome3d.com/support/forum/viewthread_thread,9807#46003
Sloped walls are created by setting different heights for the start and end points. Sweet home 3D works with levels. If you want a sloped wall on top of regular walls you do that on a new elevated level. You should read my manual "Levels explained" to understand the concept of levels in relation to walls and floors.
To create a perfect roof use the Roof Generator plugin. Read the Thread of the Roof Generator plugin because it has many tips&tricks to create the perfect roof. It's currently at 33 pages of posts but it's worth the read if you intend to create more roofs. When you download the plugin make sure you have the latest version.
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