We have professional people from all walks of the construction industry. But, when a subject comes up that no one has any reliable information on, the post is sometimes ignored. When that does occur, it is not our intention to "shun" anyone by any means, its just that we cannot answer your question with authority and reliability.
I definately pass on this question, so be patient and lets see if anyone can jump in.
We all assist in answering questions after our "real" job and this is something that we do as a "payback" to others that may have assisted us in the past. No one is paid and no benefits other than gratitude.