Common questions
Why do parapets matter when the scope is a roof rail?
Because the roof-edge support condition, appurtenances, and parapet behavior can control whether the rail detail is actually buildable and safe.
Can roof access items fall into the same review path?
Yes. Access rails, ladders, and nearby edge accessories often overlap the same receiving-structure and parapet questions as guardrail work.
Are parapet observations relevant?
They can be. Where the roof edge fronts the public right-of-way or the appurtenance condition is part of the parapet picture, teams should keep current DOB parapet guidance in view.