Q: I have an open ceiling in my garage that is insulated with paper-backed R-13 batts with the fiberglass exposed and held in place by metal strips. The ceiling has a lot of pipes and wires running over the ceiling joists. I plan to install poly-encapsulated R-19 batts into these spaces. Is it better to remove the old insulation, then install new insulation? Or can I leave the old insulation, remove the metal strips and fit the new insulation into the space? Another option would be to leave the old insulation and use a foil insulation product to enclose the ceiling. A: To put it bluntly, don't do it. Don't install poly-encapsulated R-19 insulation over the existing craft-paper-faced R-13 insulation. "Poly-encapsulated" is fancy term for fiberglass insulation encased in ...
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