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Window-to-wall ratio

Geometric ratio; limit per ASHRAE 90.1 and similar

Glazed proportion per elevation and whole-building, against the usual code limit.

North

North — wall width

North — wall height

North — glazed area

m²

South

South — wall width

South — wall height

South — glazed area

m²

East

East — wall width

East — wall height

East — glazed area

m²

West

West — wall width

West — wall height

West — glazed area

m²

Whole-building WWR

38.57 %

Moderate

Gross wall

840.00 m²

Glazed

324.00 m²

Opaque

516.00 m²

A geometric ratio. Codes differ on what counts as gross wall area — whether spandrel, parapet and floor zones are in or out — so confirm the definition and the limit that applies locally.

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