What is the permitted variation from the design thickness of the layer for Item 201?

The permitted variation from the design thickness of the layer for Item 201 is typically defined by industry standards and specifications relevant to construction and materials engineering. In this context, a variation of ± 10 mm is considered acceptable. This allows for minor deviations that can occur during manufacturing, installation, or due to material characteristics while still ensuring the integrity and functionality of the structure.

Variations in thickness greater than this can lead to issues such as compromised performance, structural integrity, or potential safety hazards, which is why tighter control and standards are established. Therefore, having a standard variation allows for practical adjustments during construction without requiring complete redesign or re-evaluation of the project, provided that adherence to this range is maintained. This context aligns with typical engineering practices regarding tolerances in material layers, illustrating why this specific option reflects a balance between flexibility and the need for precise adherence to design specifications.