We have an attic that has 18 year old blown cellulose insulation. In many areas the insulation is compacted, and as such I assume worthless. We want to re-insulate and I am thinking of going with rolled fibreglass batting, but I have some questions.
Should I lay the insulation down over the top of the current insulation, or should I force the batting into the joist space further compressing what is there? Can I over insulate? I realize I need to keep my soffet vents open, but aside from that, is there such a thing as too much insulation? I was at a minimum considering running two layers perpendicular to each other to be sure I get good coverage. Good idea or bad?
BV.