I'm currently extending my house in the UK (where this construction is less common for full houses) and the upstairs dormer is built in much the same way. Whil

I'm currently extending my house in the UK (where this construction is less common for full houses) and the upstairs dormer is built in much the same way. While I wouldn't have described it as rickety before sheathing, it's definitely much more solid once the walls have each side covered in well nailed-on OSB - it gains a lot of stability that's otherwise lacking to a degree as there's no diagonal bracing (other than some temporary elements which are removed as you add strength). I'm not a builder (I'm a musician for the most part), but what I've built is to a pro standard and millimetre-accurate. That wouldn't have been the case had it been post-and-beam!