I am a newby to this group.I am building a Wrought Iron fence to replace my wood fence. It has brick pillars every 13 feet and a wood support in the middle of the gap. I plan to keep the brick pillars and replace the wood post in the middle with a 2x2 metal. The basic question is will I need to put in some sort of expansion joint in the horizontal run. I cant see the brick pillars giving much and the run will be bolted to the pillars.Thanks, HLAlexander