Boiler room ceiling grid + insulation. The initial idea proposed by the client was to use foam board insulation, until I realized there was no way to get sheets of the stuff past the maze of pipes.
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Commerical kitchen hood duct insulation. This duct already had one layer, but the code requires two. Hardest thing about this one was the fact that whoever did the dropped ceiling continued the grid over the hood, requiring a clumsy version of Vincent Cassel’s dance through the laser field in Ocean’s Twelve to do the work. My first impulse was to cut it before starting, but everything takes longer than you think so you have to be careful not to sabotage yourself with scope-creep; first I’d have to cut down the cross tees (I didn’t have snips with me), then I’d have to cut down the drywall squares (they weren’t regular ceiling tiles), then shift over and re-attach the main runner (restaurant kitchen hoods vibrate a fair amount when operating, so best not to rest anything on them uncontained, lest it fall in).
