Louisiana-Pacific Corporation (LP) is the latest company to join a growing list of lumber producers who are curtailing mill operations, primarily in British Columbia.    LP announced that its Peace Valley facility in Fort St. John, B.C., will indefinitely curtail production of oriented strand board (OSB) beginning early in the third quarter.    “Despite efforts by our Peace Valley team to reduce costs over the past several months, this decision is necessary to support the optimization of our OSB business in challenging market conditions,” said Jason Ringblom, LP executive vice president for ...