Hi i am new to the software and trying to plan a new house. How do i make the software calculate wall sizes based off the final wall finish (i.e the plasterboard surface). As i draw the external walls and enter the dimensions i then notice that its creating the wall from the internal stud and not the finish wall surface. This means as i then start building internal walls when im trying to create a wall thats 1000mm from the external im entering 1000mm but its actually 980mm from finished all to all as its calculating from the stud surface instead.
For example i want to make this internal wall to wall space 2800 and not 2825
And when building this wall i wanted the external wall to measure 1200mm from the corner of the wall to the corner of the 90deg wall (shown in red).