The division in the Specification book that contains information regarding roofing, flashing, siding, and skylights is:

The division in the Specification book that encompasses roofing, flashing, siding, and skylights is Division 7. This division is specifically focused on thermal and moisture protection, which includes various materials and construction methods designed to prevent water infiltration and manage temperature.

Roofing systems, along with related components such as flashing that directs water away from vulnerable areas, are included here, as they are critical to the overall integrity of a building's envelope. Additionally, siding, as it provides outer protection and aesthetic appeal, falls under this category, as does skylights, which serve both functional and design purposes but require precise installation to ensure they do not compromise roofing seals and insulation.

Understanding this categorization helps in navigating construction documents effectively, ensuring all elements related to weatherproofing and exterior protection are correctly identified and addressed.