ISO 12215 is how a CE-marked boat's structure was sized: the thickness of the laminate, the size of the floors, the strength of the keel attachment and the chainplates. A surveyor doesn't recalculate it on the hard. It matters when a structural finding raises the question of whether the boat was built strong enough, and when a repair has to restore the original strength.
What it covers
From the published scopes, the parts surveyors meet most:
| Part | Covers |
|---|---|
| 12215-2 and -3 | Materials: core materials for sandwich construction; steel, aluminium alloys, wood and others |
| 12215-5 | Design pressures, design stresses and scantlings for monohulls up to 24 m, for parts treated as watertight or weathertight in the ISO 12217 stability assessment |
| 12215-6 | Structural arrangements and details not covered elsewhere, with examples of good practice, for FRP, aluminium, steel, wood and other materials |
| 12215-7 | Loads and local scantlings for multihulls |
| 12215-8 | Rudders on monohulls. Manoeuvring loads only; grounding and docking loads are out of scope |
| 12215-9 | Sailing craft appendages: design loads for the keel, centreboard and their attachments on monohulls |
| 12215-10 | Rig loads, rig attachments and mast steps, with established practices for mast steps and chainplates in its annexes |
Part 5 applies to recreational craft, including charter boats, and to small commercial craft. It excludes craft designed only for professional racing.
What surveyors check against it
Structural damage. Cracked floors, loose bulkhead tabbing, keel-to-hull joint movement, chainplate and mast step damage. Report what you see and measure. See loose bulkhead tabbing and grounding damage.
Rudders after grounding. Part 8 covers manoeuvring loads only, so a rudder bent in a grounding wasn't designed for that load. Say how it was damaged.
Repairs. A repair to the keel attachment, floors or chainplates should restore the original design. Ask for the repairer's method and whether a designer approved it.
The builder's plate. The design category on the plate is the condition the structure was designed for. Compare it with the boat's intended use.
Citing it in a finding
Report the damage and refer the design question: "Cracking in the laminate of the floors either side of the aft keel bolt. Have the keel attachment and floors assessed and a repair designed by a naval architect or the builder to restore the strength required by the original design, ISO 12215-9." Don't state that a boat fails ISO 12215 without the calculation.