I am trying to install a curtain rod about 4" above a first floor window. Unfortunately there appears to be some type of aluminum or duct work behind the drywall. Do not think it is plumbing. When drilling the pilot hole I hit the metal and drill right into it. The consistency of material felt like aluminum. I would be surprised it is were duct work given the location and the depth of the wall (exterior wall). Any thoughts on what could be back there?
Also does anyone have a tip on how to hang a curtain rod in this situation?
Thanks in advanced for any tips or advice.