I have only metal doorframes in my apartment and they are quite thick. How can I affix my mezzuzahs in a kosher fashion? Can I use very strong double-sided tape?
The mezuzah must be attached in a way that makes detaching it by hand difficult (Chovat Hadar 9,8). You can attach it to a metal doorframe by using a drill and screws or by cementing it. If the tape is strong enough to make its removal difficult- that is OK too.