Exactly how do you enforce that spec? It's the Contractor's obligation, having entered into an Agreement governed by the Contract Documents, to comply therewith.  If s/he doesn't comply therewith, s/he should just vanish from surface of the earth. How does one demonstrate commitment to nuisance?  I think most Contractors demonstrate a committment to nuisance, although some certainly are more committed to being nuisances than others. Does it matter if its not exactly ON the roof?  It is my opinion (I started to say "I believe," but that is a much weaker phrasing) that the Contractor is obligated not to commit nuisances anywhere on the site; I may have been less site-wide than I should have in the previous post regarding the matter of nuisance commission.  Like if I were hanging off the side nuisancing...is that okay? Only if the nuisance you were commiting were over your own head, but even then, you shouldn't be committing nuisances. Is it a nuisance if the Architect does it?   Architects don't commit nuisances.  This is like asking what would happen if a woman ever farted.  It just doesn't happen; it's not physically possible. What if the Building Official is a nuisance? They generally constitute nuisances, in my experience, although I will admit that I personally like a few of them (building officials, that is). What about the lawyers?  Lawyers are the very definition of "nuisance." Are you banning them from the work site? Would that it were possible. In fact, as I think about it, I don't know that any lawyer has ever been known to muddy his/her white shoes on a job site, so banning those particular nuisances from the job site is probably unnecessary, and as much a waste of Specifications text as saying "the Contractor shall...."