Trying to make use of some fiberglass insulation that is on hand and have some questions.
1) How much settling in old loose insulation is acceptable and can you simply lay fiberglass insulation over the loose insulation? The old insulation is settled roughly an inch below the rafters - if I lay in the fiberglass it would set 2-3 inches above the rafters with a rafter-width gap between each one. Doesn't seem like that would do much good.
2) After laying fiberglass insulation into some empty bays I realized those bays are over the porch. What's the effect, if any, of insulating over the porch. Does the insulation need to be removed or is it just wasted effort, but no harm done?