My assumption is that you meant they were throwing detection on top of an already acceptable building when you said:
"This is NOT the case in your proposed installation. In fact it's just the opposite...."
And not that the building is borderline Div 1. Either way, my thoughts on the matter may lean toward yours regarding waste. Thankfully I have no real stake in this site except for business...and of course doing a proper job is included in that. One other area of benefit they will have, and will be using, is to monitor, trend, and study the changes in alcohol level. Along with multiple building temps, even non concerning levels of alcohol can be used to create a "model" for a good product over a not as good product. We are using analog signals to monitor an alcohol range 0-100% LFL. If there was very gradual, low level seepage I guess it can fit into a pattern that is helpful. The only "alarmable" levels are up in the industry standard range of 25-50% LFL.
Bob, I appreciate your patience and I am sorry if there has been too much back and forth. As I said before, all of the information I've received here has equated to a huge learning experience of which I am grateful for. What is learning if not filled with questions along with an ear to listen?! Anything else you wish to add is welcome. The 5 hour drive I've gotta make in a few hours is gonna pull me away for a while though. Thanks everyone.