Why UBS just downgraded its rating on Boral (ASX:BLD) shares

Shares in building and construction materials group Boral Limited (ASX: BLD) have fallen sharply this past week, having come off a high of $6.61 on 28 October.

Boral shares continued to fall into the red today, closing at $6.34 and down 1.09%.

What’s up with the…