Derb: I happen to know a little bit about Home Depot–both my in-laws work there. Your speculation is 100% correct. Those aisles are shut down because of trial lawyers. There was a customer death a couple of years ago when something fell off a high shelf as it was being retrieved. The whole chain created a new policy of closing an aisle when they’re pulling something down from way up high. Also, Home Depots everywhere are getting a makeover–most noticeably, the orange shelves are turning beige and, less noticeably, the stocking is supposed to require fewer aisle closures. Just hope those trial lawyers don’t get a good look at your tree house.