22-0118 Daylight and Views Core and Shell Constraints


For our Interior typology project, we are coming up just short of the I10 Healthy Interior Performance requirement for 95% of regularly occupied spaces having access to views and daylight. After extensive analysis and resulting design updates, we have achieved the requirement in 94% of regularly occupied spaces. (This is after utilizing the clarification in I09 allowing for measurement of 14 meters from windows.) We believe this is still a huge success given the constraints of the core and shell building for our interior tenant improvement project, and our exploration of this Imperative led us to make beneficial improvements to the design. We believe our final design meets the intent of this Imperative. In addition, the project does meet the other requirements of Healthy Interior Performance Imperative, namely that occupants have the ability to influence their local airflow and temperature through direct input or controls, and flexible options for working are provided.

For reference, see the documentation included with this post. The building in which our Interior project is located constrained the ability to meet the 95% threshold by being a deep, square floor plate and by having only two elevations with glazing. These constraints pushed us to arrange the program so that non-regularly occupied spaces, such as restrooms and storage, are located in the back corner of the floor plate where there are no windows. The workstations are arranged along the two glazed facades, and semi-regularly occupied spaces such as conference rooms and huddle rooms are in the center of the floor plate. In the conference and huddle rooms, the design team added storefront glazing and clerestory windows where appropriate to provide access to views and daylight while maintaining privacy. All these decisions were verified and refined by computational daylight analysis and 3D view studies.

We believe our final design meets the intent of this Imperative and ask ILFI to grant us an exception.


Given the constraints of an interior project, that the design achieves 99% of the targeted access to daylight and views, and that the project team's analysis and resulting layout maximizes access to daylight and views in the most-regularly occupied spaces, the Institute finds that the intent of the requirement has been met. As proposed in the drawings and narrative supporting this Dialogue post, the Institute agrees that the project complies with the I10 Healthy Interior Performance requirement to provide access to views and daylight from 95% of regularly occupied spaces and opportunities for those occupants in the remaining five percent of regularly occupied spaces to move to compliant spaces for a portion of their day.

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