Practice Management Member Conversations

This message has been cross posted to the following Discussion Forums: Practice Management Member Conversations and Project Delivery .
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I am presently looking at a re-roofing of a Museum project. Th eown er is asking for a "zero - water infiltration" clause in the docuemnts. Is anyone aware of a definition of "zero - water inflitration" for drawing and specs. In addition address inforcement during construction. 

The project also will require an experienced roofing contractor. Beyond the requiring certified roofing  installers by the manufacturer, 5 years or more experience with product and similar type complicated roofs, and proper bonding and insurance, what additonal requirements may be added to help enssure a qualified roofing contractor. 

Any responce or experience with the above questions woudl be grealy appreiciated.

Thank you in advance for your attention.  
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Richard Shanahan AIA
Richard M. Shanahan Architects
Bozeman MT
richard@shanahanarchitects.com
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Kenneth Kruger AIA, F.ASCE
Kruger Kruger Albenberg
Cambridge MA
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Museums usually opeerate at somewhat high relative hunidity -- about 50%.  This creates increased risk of condensation, which could be claimed as water-intrusion.  Great design-and-construction care is required to assure no condensation.

Presumably this is a low-slope roof.  All membrane roofing should benefit from full-time inspection and a museum even more so.