CSST pipe is flexible and can go around corners easily making the time and expertise for install much less. After installation a "yellow information card" is supposed to be posted that states in part "CSST's wall thickness make it more likely than than rigid steel pipe to be punctured by a nail or other sharp object or by extraordinary forces such as a lightning strike." All this was a result of the 2007 class action lawsuit that found "CSST poses an unreasonable risk of fire due to lightning strikes". Another safety feature of copper and black pipe is that they can act as grounding lines in case of a lightning strike. For myself I do not feel comfortable with CSST and will pursue changing to a wall pipe for my gas in the attic. If anyone has had any experience with this changeover please post what you did and who you used.
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