i purchased a 50's era small cape cod home last year. The garage has a section of duct work that is about 6 feet in length that is flush with the ceiling and flush with the interior block wall.
options for insulating this to stop it sweating in hot humid days? there are only two surface areas of this duct, the bottom (when looking up) and the side. The other side is directly (no gap) attached to the block and the top is directly attached (also no gap) to the ceiling. I was thinking framing a simple 2x4 triangular enclosure with cellulose or pink insulation, but really don't want to have wet insulation if i do it wrong.