Chances are that you currently use your cell phone in metal roofed buildings on a regular basis. Think of the restaurants where you eat, the stores in which you shop, your bank, your church, etc. Many of those buildings have metal roofs or metal decks beneath flat roofs. Over the years and tens of thousands of roofs, we have had no more than five people tell us that their metal roof did seem to affect their cell phone reception. If you currently have very, very weak or spotty cell phone reception inside of your home, a metal roof may be the “straw that breaks the camel’s back.” Adding a cell phone signal booster in your house would have been helpful before the metal roof and certainly would be helpful after your metal roof is installed. However, if you have good to excellent cell phone reception now, the metal roof should not have any noticeable effect.
For the purposes of this question, we are going to break down the types of metal roofing based on the roofing materials.