OK. So I have 1.5 tons of shoulder stuff (MWP) and 1.5 tons of good stuff (Spruce Pointe and Lacrete) stacked in my basement. The interesting thing is that the stack of 15 layers of MWP goes all the way to the ceiling. The 15 layers of good stuff still has room for 3 more layers before I hit the ceiling. The same stacking skills were used on both stacks. Is my house sagging or does this observation show difference in the density of pellets of differing qualities?