Roof openings — name the opening in a sloping roof whose top is parallel to the roof surface In roof design, what is the term for an opening or glazed element provided in a sloping roof such that its top (upper edge) runs parallel to the roof surface?

Introduction / Context:
Daylighting devices in roofs include dormers, skylights, and lanterns, each with distinct geometries and applications. Correct naming is important for detailing, waterproofing design, and scheduling in the bill of quantities.

Given Data / Assumptions:

• Sloping roof construction.
• The top of the opening is parallel to the roof surface (i.e., aligned with the slope).
• We are distinguishing among common roof opening types.

Concept / Approach:

A skylight is an opening window or glazing set in the plane of the roof slope (or curb-mounted but parallel to the surface). A dormer projects from the roof with a vertical window and its own small roof; its top edge is typically horizontal, not parallel to the main roof surface. A roof lantern is a glazed structure over a flat roof, usually raised on a curb with multiple facets. Louvered windows describe a sash style, not a roof-opening type by geometry.

Step-by-Step Solution:

Verification / Alternative check:

Roofing manuals detail curb and flashing kits specifically labeled for skylights installed parallel to roof slope, validating the terminology.

Why Other Options Are Wrong:

• Dormer window is not parallel to the main roof surface.
• Lantern is for flat roofs and is elevated above the roof plane.
• Louvered describes operable slats, not the roof opening type.

Common Pitfalls:

• Confusing skylights with sun tunnels or roof windows with different opening mechanisms.
• Poor flashing around skylights leading to leaks.

Final Answer:

Skylight window.