## 5 New Taxonomy for Constructability Constraints and Features
### Validation of the New Taxonomy Through External Project Examples
#### 5.2.4 The Zahner Factory Expansion in Kansas City [37; 79; 80]  
Completed in 2011 and designed by Crawford Architects, this project is recognized for its innovative facade inspired by metal oxidation patterns. The goal was to create a large, column-free assembly space with clear height for material movement, seamlessly connecting it to the existing factory floor. The design transformed an underutilized area into a transparent, functional space showcasing Zahner's ability to produce highly engineered forms. The design's key components are vertically oriented fins, commonly used as structural backups behind organic facades manufactured by Zahner. Additionally, a glass panel system was implemented in this project to provide transparency between the factory's activities and the surrounding neighborhood, while offering ideal northern light to the assembly space. Computational design approaches were pivotal in addressing constructability challenges, particularly concerning the building's complex facade. According to [37; 79; 80], the Zahner Factory Expansion project faced several geometric constructability challenges, particularly related to its innovative facade design. Custom-made aluminum panels were developed in the form of vertical fins, requiring careful attention to both design and fabrication. Optimizing the spacing of these fins was essential to maintain structural integrity while achieving the desired visual effect. Additionally, the fins were composed in a manner that created a wave-like impression, adding a dynamic and visually striking element to the building's exterior. In addition to geometric challenges, the project encountered issues related to fabrication and project management. Efficient fabrication and assembly of the panels were critical to ensuring that the intricate design could be realized within the project's constraints. The effective integration of structural and aesthetic elements posed another significant challenge, demanding close collaboration among stakeholders. Moreover, prefabrication was prioritized to minimize on-site adjustments, streamlining the construction process and reducing potential delays. Tables 1-3 summarize the cross-referencing of the new taxonomy's levels and constraints with the geometric constructability constraints identified in the selected projects. As shown, all identified constraints align with the new taxonomy's categories, supporting the validation of its structure. With this validation, the new taxonomy can now serve as a control measure in the computational design process. By using the new taxonomy, computational designers can systematically review its levels to ensure that all related geometric constructability constraints are addressed. Moreover, computational designers will be able to incorporate necessary experts' knowledge and develop the corresponding constructability features, thereby streamlining their workflows more effectively. The next section focuses on applying a refined approach using the validated taxonomy. \begin{table}
\begin{tabular}{l l} \hline \hline  & \multicolumn{1}{c}{**Micro Level**} \\ \hline
**Taxonomy’s Geometric** & \multirow{2}{*}{**Observed Geometric Constructability Constraints**} \\
**Construcability** & & **Observed Geometric Constructability Constraints** \\ \hline  & **Eight Spruce St:** \\  & \(\bullet\)  Stack at window sill: 14” above finish floor \\  & \(\bullet\)  Aluminum frame panels: 2” min.