[MrChip72]

Originally Posted by villagetinker

There are steel lintel beams in the area where you will be installing the brackets for your curtains. You typically have about 1/2 to 5/8 inch of stucco before you hit the steel. I would try to use light weight curtains, and be very careful with the installation of the hangers. Specifically, I would do some test drill holes to confirm how thick the stucco is, then I would drill suitable holes for the plastic inserts, and I would use a good sealer in the hole, then insert the plastic insert, and the screw. The sealer will give added support to the plastic insert.
I have drilled the steel beam on 2 occasions, once with a hand drill and I needed 3 bits for each hole. First a concrete bits to get to the beam, then a cobalt bit to get through the beam, and then a slightly smaller concrete bit to finish the hole. Lots of work. The second time I used a SDS bit and a suitable hammer drill and was able to drill the holes with one bit in under 15 seconds.
Hope this helps with your project.

Thank you for this information!