Windows in Sloping Roofs – Identifying the correct term Which term describes a window provided on a sloping roof, projecting from the roof plane to admit light and ventilation into the attic or upper room?

Introduction / Context:
Roofs often incorporate special window types to bring daylight into attic spaces. Understanding the terminology helps in detailing weatherproof junctions and in communicating with architects and contractors.

Given Data / Assumptions:

• Window is built into and projects from a sloping roof.
• Purpose is light and/or ventilation of the attic/loft.
• Traditional pitched roof context.

Concept / Approach:
A dormer window is a vertical window set on a small roofed structure projecting from the main sloping roof. The dormer's cheeks and roof require flashing to integrate with the main roof covering. It differs from a lantern (rooflight cupola), and from generic louvered windows (defined by slats).

Step-by-Step Solution:
Identify placement: on the slope, projecting outward.Match to “dormer window”.Exclude other window types that do not specifically describe a projection on a sloped roof.

Verification / Alternative check:
Architectural standards and detailing guides show dormers in many styles (gable, hip, shed), all requiring careful flashing.

Why Other Options Are Wrong:

• Lantern window: glazed rooftop cupola or ridge light, not a roof projection with vertical window in a cheeked structure.
• Louvered window: describes opening/vent device, not the roof integration.
• “Rash window” and “Air window”: nonstandard terms for this application.

Common Pitfalls:
Confusing dormers with skylights/rooflights (which lie in the plane of the roof). Dormers add headroom but require more complex waterproofing.

Final Answer:
Dormer window