Library
Field reference & curated resources
Structural tolerances, EPSG codes, AutoCAD plugins, LISP macros, standards, and professional links—formatted for rapid consultation.
Positional & level tolerances
Standard alignment limits for construction elements
NSSS 6th Edition — Positional Tolerances
| Element | Tolerance | Condition | Source |
|---|---|---|---|
| Column position on plan | ±5 mm | Erected position | NSSS 4.2.1 |
| Column base position | ±6 mm | On holding-down bolts | NSSS 4.1.3 |
| Column verticality (H ≤ 30m) | H/600, max 25 mm | Single storey | NSSS 4.2.2 |
| Beam level at support | ±5 mm | From datum | NSSS 4.3.1 |
| Beam level at mid-span | ±10 mm | From datum | NSSS 4.3.2 |
| Slab level | ±10 mm | From structural datum | NSSS 4.4.1 |
| Connection bolts in template | ±3 mm | Between holes | NSSS 5.1.2 |
NCSC Concrete Tolerances
| Element | Tolerance | Condition | Source |
|---|---|---|---|
| Column position | ±15 mm | Formed position | NCSC T1 |
| Wall face alignment | ±8 mm | In any 5m length | NCSC T2 |
| Slab soffit level | ±10 mm | From datum | NCSC T3 |
| Opening position | ±25 mm | In plan or level | NCSC T4 |