While you can generally drill holes in a structural beam you have to be sure of their size and placement in the beam. I'd be worried about that plaster on the roof containing asbestos. Also I don't imagine any nice way to disturb it without it looking bad.
ilikeawesome t1_ja9lsfi wrote
Reply to Attaching dowels to a steel beam which is covered with stucco on the sides by Drachenlol2
While you can generally drill holes in a structural beam you have to be sure of their size and placement in the beam. I'd be worried about that plaster on the roof containing asbestos. Also I don't imagine any nice way to disturb it without it looking bad.