Window- Wall Ratio

During the design phase, when the architect is placing windows, it is important to take note of the window-wall ratio. Optimal window-wall ratio should be In-Class Exercise #08a: Window Wall Ratio 40%. A window-wall ratio too large will

make insulating the building very difficult, while a window-wall ratio too small won’t allow enough sunlight into the building.

1 - A building has a floor slab that is 20’ x 30’. Each exterior wall is 20’ tall. Windows comprise 25% of the walls. There are two (2) doors and each is 3’ wide by 7.5’ tall. The hip roof is 1,400 sf total. What percentage of the overall building is each component?

Floor Slab: 15% Exterior Walls: 36% Windows:13% Doors:. 01% Hip Roof 35% 2 - A building with a flat roof has the elevations below. What is the WWR (Window Wall Ratio)? Calculate for each facade and for all walls combined. We are only looking at walls in this case.

North

25%

East

45%

South

52%

West

27%