I wish to thank you for your solid counsel. I will look into recycling them somewhere. The "smash and sweep" method of discarding toxic tubes seems a bit irresponsible. Long story short I salvaged a bunch 8 ft tubes and fixtures from a building demo and now I'm stuck with about 25 burnt tubes.
Does anyone have experience using corrugated steel siding for garage ceiling? Any concerns or advice on how to install it would be appreciated. Planning on insulating ceiling with batts first then steel. Is condensation an issue in colder climates?