"***Composite wood products*** -- lumber substitutes made from smaller pieces of wood -- are continually improving as solid lumber becomes more scarce and wood adhesives improve. These manufactured products are changing the lumber industry and one day even may replace the 2-by-4, says Roy Adams, associate professor of wood products in Penn State's School of Forest Resources.
'***Composite woods*** became popular in the '40s and '50s during the post-war building boom," Adams says. "Because you can't get a 4-by-8-foot sheet of wood out of a tree, lumber mills on the West Coast made softwood plywood out of Douglas fir, and later Southern mills made it from yellow pine.'"

http://www.oldhouseweb.com/stories/Detailed/12282.shtml

¡Saludos de nuevo! ;-)