The different pace of the Australian and New Zealand economies has also helped drive the kiwi dollar up against the Australian dollar to near five-year highs and the translation effect hurt reported earnings by about $7 million in the latest year.
"We anticipate year on year (the hit) will be about $15 million to reported earnings," Adamson said.
The outlook for the Australian business, Fletcher's second-largest market, "remains soft and uncertain."
"A sustained improvement in activity levels in New Zealand coupled with operational efficiency gains should drive earnings growth," the company said. "However, no significant volume growth is forecast in the Australian market and any further deterioration from current levels will temper the group's earnings momentum."
Adamson said there are some signs that record low interest rates in Australia are starting to revive activity in New South Wales but the company is yet to see that spread to Victoria and Queensland, while Western Australia is feeling the effects of a slowdown in mining and resources investment.
Fletcher's net profit jumped to $326 million in the 12 months ended June 30, from $185 million a year earlier, when the Auckland-based company took $132 million of charges. Sales fell 4 per cent to $8.8 billion. Profit beat First NZ Capital's estimate of $304 million.
The shares jumped 4.8 per cent to $8.60 after the results.