Pulp & paper: Adjusted EBITDA was - $1 million in Q4 compared with - $6 million in Q3. Virostek attributed the sequential improvement largely to a major maintenance shutdown in Q3 .North America EWP: Adjusted EBITDA was - $24 million in Q4 versus - $15 million in Q3. Virostek said the company recorded a $239 million non-cash restructuring and impairment charge tied to the indefinite curtailment of the High Level, Alberta OSB mill .Lumber: Adjusted EBITDA was - $57 million in Q4, compared with - $123 million ...