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        Q: How thick should an exterior wall be?
A: In the U.S. , in the majority instances , the framing for both interior and exterior walls is 2x4 dimensional timber with an actual dimension of 1-1/2 inches x 3-1/2 inches . With 1/2 '' drywall on either side , a finalized interior wall will be 4-1/2 '' thick . With drywall on one side , and 1/4-3/4 '' exterior sheathing on the other side , an exterior wall will be different in thickness . Siding , stucco , or brick veneer will add to the exterior wall 's total thickness . 

Q: What is the thickness of an interior wall and exterior wall?
A: any project i do it 2x6 walls all over subsequently 2x4 interior walls . Matt O & P Concrete 

Q: Painting interior walls?
A: yep . I did that in one of the housings I have lived in .   Sand it smooth , prime it , paint it . You 're golden .