Boral - Sharp Falls, page-51

Here's a couple more: the North American assets aren't fully baked in to the share price (SP). It was a large and complex acquisition and investors were skeptical it would/could work.
BLD have done well so far IMO, but have a couple years of efficiencies to keep gaining. As these all hit, NA profits should keep increasing - thus should flow back to SP gains.

Sounds like there are also plenty of opportunities in the NA flyash space too.

Also the gyprock/drywall JV business. Seems they found a loophole it which to buy it out (if it makes sense to do so). Per the recent announcement, they're running the numbers now to work out how to play this. Could potentially be a good opportunity - we'll have to wait and see - but I expect this'll take a few years to play out in the SP too (aside from a possible short term spike, on news).