Originally Posted by jbarwick
I will have to check on the ceiling fans but all of the can lighting is pretty new from the 2000s. There was some added blown in insulation at some point but not much. The rigid insulation is not a bad idea and seems easy enough. Another thing I need to look into is if I have enough air circulation up there before I add more insulation. If not I will have to add some vent chutes but that is easy enough.
You can never have too many soffit vents, especially if you have power ventilation. No matter how the attic is vented it's probably pulling the air out of your house. It really pays to seal the ceiling (do the wall cavities, too). Caulk is cheap. Do it before you add more insulation.
There should be no harm in covering ceiling fan wires with insulation. The problem with light cans is that the bulb can get really hot and the heat has nowhere to go if it's in a box surrounded by insulation. Ceiling fan boxes don't have that problem. Do caulk the hell out of those ceiling boxes, though. Each one is like a big hole in your ceiling.
Oh, when I said to tape the boxes, I meant tape the foam together to make a box. Shove the box down over the fixture and caulk it to the ceiling (a brick or a book or something on top helps to hold it in place as the caulk dries).