Is it possible to make external walls 9,52 in (242 mm) and thinner internal walls, for example, 6,37 in (162 mm) or 7,95 in (202 mm)?
It is possible, but we recommend to make the outer and inner walls, of the beam of the section, for uniform shrinkage of the structure. The minimum allowable difference in the thickness of the timber, not more than 1,57 in (40 mm)