A building assembly module is a distinct, repeatable subcomponent within a larger building assembly, such as a wall, floor, or roof system. It represents a logical layer or portion of the assembly that performs a specific function—such as structure, insulation, waterproofing, or finish.
In modular detailing frameworks (such as those used in BIM or generative design systems), modules are often divided into:
Assembly Modules may also include additional variants, such as “inner addition” or “outer addition,” to account for performance upgrades, transitions, or phased construction. These layers work together to deliver specific environmental or structural performance within the full assembly.
Modeling and organizing components as building assembly modules improves:
Assembly Modules support the increasing complexity of modern façades, envelope systems, and interior partitions by breaking them into manageable, editable parts.
In a mid-rise commercial project with a complex façade composed of multiple cladding systems, the design team implemented a modular strategy by defining distinct building assembly modules, such as “outer cladding,” “structural backup,” and “thermal control layers.” This allowed them to isolate detailing responsibilities and performance criteria within each module, rather than redrawing each condition from scratch.
By leveraging a module-based detailing logic, teams could rapidly test variations in insulation thickness, fire-rated assemblies, or membrane locations without compromising overall design structure. This was especially useful for conditions where multiple façades met. For example, where a rainscreen system transitioned to a punched opening or curtain wall condition.
With a supporting system, the team could map module variants across typical and edge conditions, automate logic checks, and identify where critical transitions were underdeveloped or inconsistent. This not only improved internal coordination but also reduced the manual labor of redetailing repeating conditions, which leads to a clearer, more reliable Construction Documentation set.
The modular assembly logic also made it easier to collaborate with consultants and product reps, since each layer was clearly defined in terms of material, location, and responsibility.
A building assembly module is like a building block within a wall or roof—each one handles a job, like support, waterproofing, or finish. Together, they make up the full assembly.
The D.TO platform is built around modular detailing logic. It allows designers to structure BIM assemblies using a clear module framework—such as “Outer,” “Inner,” “Outer Addition,” and “Inner Addition.” D.TO then applies this logic to:
With D.TO, building assembly modules aren’t just modeled—they’re analyzed, versioned, and optimized within the broader project context. This supports both design flexibility and documentation precision at scale.
Discover how D.TO enhances your daily design workflows on D.TO’s key features page, or schedule a demo to explore them in more detail!!
