Oh be serious.
Read the original post. The house was built in 1850s, the ceiling joists are attached to the rafters like collar ties. He's only raising them 6 inches and he's going to a dimension of lumber that will dramatically increase strength of the joists AND give him more surface area to attach the ceiling joists! Raising 6 inches will not reduce the strength of the long rafters enough to affect the snow loads in this application. An engineer would recommend so much more than is necessary (to cover his tail) that this project would become more than just the ceiling. An engineer would have him tearing out walls and installing brackets and gussets everywhere. Possibly removing his roof and replacing it all with new rafters and sheet decking to prevent racking.
I realize that homeowners can destroy the structural integrity of their home quickly and innocently. BUT, this is not one of those cases. Removing the floor joists from the top plates of the wall below is a big old double dog NO-NO, but that's not what he's talking about here. I'll bet that the current 4x4 ceiling joists are barely hanging, toe-nailed into the rafters, OR, nailed from the rafter side. If he uses bolts to attach the new 2x8s, once again he is far the better.
This is not a major structural engineering problem. Pull the old joists one at a time, replace it, then move on to the next one.
Tom in KY, not that big of a deal.