Thanks for all the great info. What I'm trying to pin down are which types of attics are notoriously difficult to retrofit and why? I have some sense of the problems but no real sense of the extent of the difficulty and how widespread the issues.
Just researching online:
http://www.pmengineer.com/articles/89255-potential-pitfalls-of-unsprinklered-and-sprinklered-attics
I know there are freezing concerns, difficulty getting water up to the top of the building, etc.
I'm writing a paper on NFPA 13 Attic Sprinklers and am trying to gather information on why they are expensive and difficult to protect. Does anyone have a sense of how expensive it would be to protect say a 1000ft space above a theatre? What are the issues associated with this?
