With Housing going soft, these charts say Lumber production should start to fall immanently. Yes, these maths will work on production output data, not just prices!

Note the nodes now being reached, .500 on earlier format (with a trendline crossover, another indication of change, lower chart), and on a different study, -1.0 on the newer format (upper chart). The reason this works for production data, is because raising or lowering production is an economic decision, not unlike buying or selling a security.