These drain and vent pipes are attached directly to the basement wall. I need to insulate that wall with foamboard insulation. This means carefully cutting out pink foamboard shapes that exactly match the pipe hangers and fitting them into place. Then I’ll have to do this again for with the fire-resistant foil-faced foamboard, but this time I’ll have to insulate around the pipes themselves… very complex shapes. What a painstaking job. No contractor would do this kind of work, but I’ll feel better knowing that wall is thoroughly insulated.