HBP - got around to buying a small position in this. You're right that they are less exposed to lumber than I thought. It's ~10% of their sales.
Unfortunately, doesn't look like they break out operating income by their 3 divisions (millwork, building products, wood products). At most, it looks like the wood products division may have contributed ~3 million to operating income (though I suspect that's too high; I'm assuming ~12% margins here, comparable to some other lumber companies I follow).