Understanding LOD in Stair Construction: The Importance of Detail and Accuracy

Stair construction is a critical component of any building project, and the level of detail and accuracy of the stair model is crucial for ensuring the safety and functionality of the final product. That's where Level of Development (LOD) comes in. LOD is a standard used in the building information modeling (BIM) process to indicate the level of detail and accuracy of a building model at a specific stage of the project. In this blog post, we will explore the different LOD levels in stair construction and their significance in the overall building process.

LOD 100: Assumptions for all stair systems

At LOD 100, assumptions are made about the stair systems and elements included in other modeled elements such as a spatial or massing element. This level represents the most basic level of information, and is typically used in the early stages of the project when the overall design is still being developed. Assumptions for fire escapes and ladders are also included in this level.

LOD 200: Generic model element with simplified treads and risers

At LOD 200, the stair model includes more detailed information such as nominal overall unit scope and dimensions. Treads and risers are simplified, and nominal plan dimensions (length and width) and nominal vertical dimensions (levels and landings) are included. This level is typically used during the schematic design phase of the project, when the overall design is being refined and the stair layout is being developed.

LOD 300: Major stair support elements are modeled

At LOD 300, major stair support elements such as stringers are modeled with more accuracy. Element is accurate as to riser count, riser height, tread width, nosing conditions, including top and bottom, and landing geometry. This level is typically used during the design development phase of the project, when the design is being further refined and the stair layout is being developed.

LOD 350: Secondary stair support elements are modeled

At LOD 350, secondary stair support elements such as hangers, brackets, and handrail connection points are modeled. This level is typically used during the construction documents phase of the project, when the design is being finalized and the stair layout is being developed.

LOD 400: All stair elements are modeled to support fabrication and installation

At LOD 400, all stair elements are modeled to support fabrication and installation. This level is typically used during the construction phase of the project, when the stair layout is being developed and the construction documents are being finalized.

In conclusion, Level of Development (LOD) is an important standard in the building information modeling (BIM) process for stair construction. Each LOD level represents a different stage of the project and provides a different level of detail and accuracy for the stair model. The LOD levels range from basic assumptions at LOD 100, to detailed models at LOD 400. Understanding the different LOD levels and their significance in the overall building process is crucial for ensuring the safety and functionality of the final product.