If you are dead set on adding on the existing slab, be sure to drill the edge and pin it to the new. That will keep them form separating either vertically or horizontally. Someone mentioned a steel rail which would be nice, but at a minimum add a large wood beam for lifting.
Roll up doors are nice as light placement is more flexible, but air sealing at the top is difficult. and there is normally some leakage through the door seams. The latter can be helped with an add-on bubble foil sheet.
High windows and/or skylights are nice. Work for light and ventilation. Big exhaust fan if doing any painting or welding.
Roll up doors are nice as light placement is more flexible, but air sealing at the top is difficult. and there is normally some leakage through the door seams. The latter can be helped with an add-on bubble foil sheet.
High windows and/or skylights are nice. Work for light and ventilation. Big exhaust fan if doing any painting or welding.