outside sconces mounted on brick
Hello, Reciently I watched season 11, episode 13 on outside scounce replacement. I am in the process of replacing mine. The one at my back door was done in the same manner as the episode - but - the 3 front ones were monted on brick. I noticed that those 3 were not flush and in the past 10 years, the wind and water has allowed some seepage to the back of the sconces. How can I use the same process from episode 13 with the brick. Should I just have a sealent, or should I use cement to level the brick before mounting the new sconces? I could use a reply ASAP as my repairman will be here this week. Thank you.