The attic is our house's thermal weak spot.

It's poorly insulated (only 4 inches of blown fiberglass).

All the wiring in the upstairs used to be knob & tube, and was laid directly over the joists.  In order to blow the insulation in, they laid cheap particle board flooring down, sandwiching the K&T between the flooring and joists.  Insulating around knob & tube with blown insulation is a HUGE fire hazard, especially with the wiring being brutally crushed by the flooring.  I'm truly in awe this place didn't burn down years ago.

Anyway, the K&T is all disconnected now and I can sleep a bit better for that.  There's still much to do though in that dark, itchy space under the roof.  More insulation would be a huge benefit, but we'll need to take the flooring up and run some more lumber perpendicular to the existing joists.  It wouldn't be a bad idea to remove the existing insulation and put a vapor barrier in either.

It's kinda tragic, really.  So much work to do up there, so little time in which to do it!