Shares in CSR have fallen sharply after earnings in the building products supplier's aluminium division took a fall.

CSR’s net profit before significant items rose 11 per cent to $183.8 million in the year to March 31, just shy of the top end of its $154 million to $184 million forecast. After significant items, net profit was up 25 per cent to $177.9 million. The lift in net…