The US$56.7m increase was mainly due to a 70% increase in realised pricing that was partially offset by a 2% decrease in sales volumes.
Adjusted EBITDA for the Q1, 2013 was US$62.5m compared to adjusted EBITDA of US$9.6m in the same quarter last year.
Ainsworth President and CEO, Jim Lake said: "I am pleased to report very strong Q1 results as we benefited from the early stages of the US housing market recovery and significantly stronger OSB pricing."
