If you’ve ever spent some time amongst old-house lovers, and especially the craftspeople who work on them, you’ll no doubt have heard mention of “old-growth lumber.” It’s a material that’s spoken of with reverence, usually as supporting evidence for the “they don’t build ’em like they used to” argument, and always contrasted with today’s lumber, which is deemed comparatively subpar. So what is it about old-growth lumber that makes it so legendary, and if it’s so great, why don’t we use it anymore? …So yes, the trees are generally between 100 and 150 years old, but old-growth lumber is also characterized by competition to survive and disturbance history. In other words, if the forest is left alone for long enough, and no natural disasters reset the clock, you end up with old-growth trees. So it’s not that we can’t produce old-growth lumber now, it’s that it doesn’t fit our production needs.