prEN ISO 12216

• Abstract:

  This document specifies technical requirements and test methods for windows, portlights, hatches, deadlights and doors on small craft with a length of hull, LH, as defined in ISO 8666:2016, of up to 24 m. It takes into account the type of craft, its design category, and the location of the appliance.; The appliances considered in this document are only those that are critical for the craft's watertightness.; Openings and non-opening devices fitted below area I (see 3.5.2) are excluded from the scope of this document.

• Status: Not Published
• Publication Date: 01-Feb-2028
• ICS: 47.080 - Small craft
• Technical Committee: CEN/TC 464 - Small Craft
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 09-Jul-2026
• Completion Date: 09-Jul-2026
• Directive: Harmonized Standard2013/53/EU - Directive 2013/53/EU of the European Parliament and of the Council of 20 November 2013 on recreational craft and personal watercraft and repealing Directive 94/25/EC
• Mandate: M/542 - [C(2015)8736] Standardisation Request to the European Committee for Standardisation and the European Committee for Electro-technical Standardisation as regards recreational craft and personal watercraft in support of Directive 2013/53/EU of the European Parliament and of the Council of 20 November 2013 on recreational craft and personal watercraft and repealing Directive 94/25/EC.
• Ref Project: oSIST prEN ISO 12216:2026 - Small craft - Windows, portlights, hatches, deadlights and doors - Strength and watertightness requirements (ISO/DIS 12216:2026)

• Revises: EN ISO 12216:2022/A11:2023 - Small craft - Windows, portlights, hatches, deadlights and doors - Strength and watertightness requirements
• Effective Date: 19-Jun-2024
• Revises: EN ISO 12216:2022/A1:2022 - Small craft - Windows, portlights, hatches, deadlights and doors - Strength and watertightness requirements (ISO 12216:2020)
• Effective Date: 19-Jun-2024
• Revises: EN ISO 12216:2022 - Small craft - Windows, portlights, hatches, deadlights and doors - Strength and watertightness requirements (ISO 12216:2020)
• Effective Date: 19-Jun-2024

Overview

prEN ISO 12216:2026 – “Small craft – Windows, portlights, hatches, deadlights and doors – Strength and watertightness requirements” is an international draft standard developed by CEN in conjunction with ISO. This document sets out technical requirements and test methods for critical openings and closures-specifically windows, portlights, hatches, deadlights, and doors-on small craft with a length of hull (LH) up to 24 meters, as defined by ISO 8666:2016. The requirements account for the type and category of boat, as well as the specific location of the appliances. The standard aims to ensure these vital components provide appropriate strength and watertightness to maintain safety and functionality in marine environments.

Key Topics

• Scope of Applicability
  • Applies to small craft with LH ≤ 24 m
  • Covers appliances that are essential for watertightness
  • Excludes openings and non-opening devices fitted below "area I"
• Types of Appliances
  • Windows: Glazed components for light and visibility
  • Portlights: Framed windows, fixed or openable, below deck
  • Hatches: Openings used for access, ventilation, or escape
  • Deadlights: Secondary watertight closures for increased safety
  • Doors: Companionway and access closures above and below deck
• Strength Requirements
  • Appliances must meet defined standards of structural strength
  • Includes tests for both fixed and opening devices
  • Frames, plates, fastenings, and joints are assessed for performance
• Watertightness Performance
  • Defines degrees of watertightness (waterproof, watertight, weathertight, spraytight)
  • Appliances are tested according to their position and the craft’s design category
• Material Considerations
  • Covers acrylics, glass types (annealed, tempered, laminated), and related materials
  • Specifies use of compliant metals and plastics

Applications

Adhering to prEN ISO 12216:2026 delivers practical value across a range of stakeholders in the small craft industry:

• Boat Builders and Designers
  • Ensures that critical closures like windows, hatches, and doors meet internationally recognized standards for marine safety and integrity
  • Assists in selecting compliant materials and construction methods
  • Enables clear assessment and documentation for regulatory and customer assurance
• Equipment Manufacturers
  • Guides the design and factory testing of prefabricated windows, portlights, hatches, and doors for small craft applications
  • Supports the development of product documentation, labelling, and marketing claims related to watertightness and strength
• Surveyors and Inspectors
  • Provides clear testing methods for on-site compliance checks before craft commissioning or certification
  • Offers criteria for inspection of both new and in-service vessels, aiding in maintenance and retrofits
• Owners and Operators
  • Enhances overall onboard safety by ensuring all critical apertures prevent water ingress and withstand expected loads
  • Offers reassurance for recreational and commercial users across different marine environments (oceans, coastal, inland)

Related Standards

To ensure comprehensive compliance and performance, prEN ISO 12216:2026 should be considered alongside these key references:

• ISO 8666:2016 – Small craft - Principal data (definition of hull length and other terms)
• ISO 9094:2022 – Small craft - Fire protection
• ISO 12215-5:2019 – Small craft - Hull construction and scantlings - Design pressures for monohulls
• ISO 12215-7 – Small craft - Hull construction - Local scantlings for multihulls
• ISO 12217-2 – Small craft - Stability and buoyancy assessment for sailing boats (≥6 m)

By detailing strength and watertightness requirements for small craft closures, prEN ISO 12216:2026 helps elevate safety, durability, and regulatory compliance for manufacturers, boat builders, and marine professionals worldwide. Use of this standard supports harmonization across the international boating sector and provides a robust foundation for technical innovation and trusted vessel design.

SLOVENSKI STANDARD
01-september-2026
Mala plovila - Okna, lopute, pokrovi in vrata - Zahteve za trdnost in odpornost proti
vodi (ISO/DIS 12216:2026)
Small craft - Windows, portlights, hatches, deadlights and doors - Strength and
watertightness requirements (ISO/DIS 12216:2026)
Kleine Wasserfahrzeuge - Fenster, Bullaugen, Luken, Seeschlagblenden und Türen -
Anforderungen an die Festigkeit und Wasserdichtheit (ISO/DIS 12216:2026)
Petits navires - Fenêtres, hublots, panneaux, tapes et portes - Exigences de résistance
et d'étanchéité (ISO/DIS 12216:2026)
Ta slovenski standard je istoveten z: prEN ISO 12216
ICS:
47.080 Čolni Small craft
91.060.50 Vrata in okna Doors and windows
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 12216
ISO/TC 188
Small craft — Windows, portlights,
Secretariat: SIS
hatches, deadlights and doors
Voting begins on:
— Strength and watertightness
2026-07-08
requirements
Voting terminates on:
2026-09-30
Petits navires — Fenêtres, hublots, panneaux, tapes et portes —
Exigences de résistance et d'étanchéité
ICS: 47.080
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 12216:2026(en)
DRAFT
ISO/DIS 12216:2026(en)
International
Standard
ISO/DIS 12216
ISO/TC 188
Small craft — Windows, portlights,
Secretariat: SIS
hatches, deadlights and doors
Voting begins on:
— Strength and watertightness
requirements
Voting terminates on:
Petits navires — Fenêtres, hublots, panneaux, tapes et portes —
Exigences de résistance et d'étanchéité
ICS: 47.080
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: [phone]
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 12216:2026(en)
ii
ISO/DIS 12216:2026(en)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 General definitions of openings and their coverings .2
3.2 Devices covering an opening.2
3.3 Plate of an appliance .3
3.4 Specific appliances .3
3.5 Area definitions .4
3.6 Plate end-connections .6
3.7 Types of glass .6
3.8 Watertightness .7
3.9 Other general definitions .7
4 Symbols . 9
5 General requirements . 10
5.1 Strength of appliances .10
5.2 Watertightness of appliances .10
5.2.1 Minimum degree of watertightness .10
5.2.2 Additional requirements for appliances related to watertightness .10
6 Plate materials .11
6.1 General .11
6.2 Acrylic sheet materials .11
6.3 Glass .11
6.3.1 Restrictions of usage .11
7 Specific requirements of appliances . .11
7.1 Plate end connection and location .11
7.1.1 Simply supported plates .11
7.1.2 Semi-fixed plates . 12
7.2 Fastening requirements . 12
7.2.1 Fastening of plates and frames . 12
7.2.2 Fastening of semi-fixed plates . 13
7.2.3 Fastening of glued plates . 13
7.3 Special requirements . 13
7.3.1 Appliances fitted in area I .14
7.3.2 Appliances fitted in area IIa . 15
7.3.3 Flush deck companionway opening sill heights .17
7.3.4 Sliding appliances .18
7.3.5 Washboards .18
7.3.6 Securing system .18
7.3.7 Deadlights.18
7.3.8 Multihull escape hatches .18
7.3.9 Prefabricated appliances .19
7.3.10 Appliance systems .19
8 Strength assessment .20
8.1 Assessment methods for appliances strength . 20
8.2 Monolithic material plates — Direct calculation methods . 20
8.2.1 General . 20
8.2.2 Monolithic material semi-fixed or simply supported plates — Direct calculation
method . 20
8.2.3 Selection of monolithic material plate thickness .21
8.2.4 Plate aspect-ratio coefficients, kr and kf . 22
8.2.5 Design pressure . 23

iii
ISO/DIS 12216:2026(en)
8.2.6 Plate size pressure reduction factor . 23
8.2.7 Hull length pressure reduction factor .24
8.2.8 Curvature coefficient.24
8.2.9 Flexural strength and modulus of elasticity .24
8.2.10 Safety factor and minimum plate thickness .24
8.2.11 Monolithic material plate simply supported on 2 sides — Direct calculation . 25
8.2.12 Monolithic material plate simply supported on 3 sides — Direct calculation . 25
8.3 Laminated glass — Direct calculation . 26
8.4 Advanced calculation method.27
8.5 Pressure test assessment method . 28
8.6 Mullion calculation . 28
Annex A (informative) Location areas of appliances above WLREF .34
Annex B (informative) Types of plate edge connection .36
Annex C (normative) Unsupported plate dimensions .38
Annex D (normative) Test methods .40
Annex E (normative) High-impact-resistance glass . 47
Annex F (informative) Precalculated tables .48
Annex G (informative) Background information .79
Annex ZA (informative) Annex ZA .81
Bibliography .84

iv
ISO/DIS 12216:2026(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types
of ISO documents should be Noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent
rights identified during the development of the document will be in the Introduction and/or on the ISO list of
patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 188, Small craft.
[1]
This third edition cancels and replaces the second edition (EN ISO 12216:2022/A11:2023 ), which has been
technically revised.
The main changes compared to the previous edition are as follows:
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

v
DRAFT International Standard ISO/DIS 12216:2026(en)
Small craft — Windows, portlights, hatches, deadlights and
doors — Strength and watertightness requirements
1 Scope
This document specifies technical requirements and test methods for windows, portlights, hatches,
deadlights and doors on small craft . It takes into account the type of craft, its design category, and the
location of the appliance.
The appliances considered in this document are only those that are critical for the craft's watertightness.
Openings and non-opening devices fitted below area I (see 3.5.2) are excluded from the scope of this
document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 6603-1, Plastics — Determination of puncture impact behaviour of rigid plastics — Part 1: Non-instrumented
impact testing
ISO 9094, Small craft — Fire protection
ISO 9094:2022, Small craft — Fire protection
ISO 12215-5, Small craft — Hull construction and scantlings — Part 5: Design pressures for monohulls, design
stresses, scantlings determination
ISO 12215-5:2019, Small craft — Hull construction and scantlings — Part 5: Design pressures for monohulls,
design stresses, scantlings determination
ISO 12215-7, Small craft — Hull construction and scantlings — Part 7: Determination of loads for multihulls and
of their local scantlings using ISO 12215-5
ISO 12217-2, Small craft — Stability and buoyancy assessment and categorization — Part 2: Sailing boats of hull
length greater than or equal to 6 m
ISO 15510, Stainless steels — Chemical composition
EN 485-2, Aluminium and aluminium alloys - Sheet, strip and plate - Part 2: Mechanical properties
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/

ISO/DIS 12216:2026(en)
3.1 General definitions of openings and their coverings
3.1.1
hull
[2]
envelope of the craft located below sheerline, as defined in ISO 8666
3.1.2
deck
[2]
envelope of the craft located above sheerline as defined in ISO 8666
3.1.3
superstructure
decked structure on the deck
3.1.4
transom
aft limit of the hull
3.1.5
craft envelope
hull, deck or superstructure in which an opening might admit water into the interior
3.1.6
heeled waterline
level of the water on the hull in the fully loaded ready-for-use m condition when the craft is inclined to
LDC
— 7° for motor boats and sailing multihulls; or
— 30° or immersion of the sheerline, whichever occurs first, for monohull sailing boats
[2]
Note 1 to entry: The fully loaded ready-for use condition is defined in ISO 8666 .
3.1.7
opening
cut-out in the envelope of a craft such as in the hull or superstructures
Note 1 to entry: An opening is usually covered by a glazing or an appliance, that can be fixed or opening.
3.1.8
clear opening dimensions
dimensions of the area within a structure or frame, through which objects or people may pass when the
incorporated plate is disregarded
3.2 Devices covering an opening
3.2.1
appliance
device made of a plate (3.3.1) plate and its associated frame(s), opening (hingeing) and fixture systems,
when included, used to cover an opening in the hull, deck or superstructure of a boat; it can be fixed or
openable (detachable, hinged, sliding, folding, etc.)
EXAMPLE window (3.4.1), portlight (3.4.2), hatch (3.4.3), deadlight (3.4.7), door (3.4.6), sliding appliance (3.2.5),
escape hatches.
3.2.2
fixed appliance
non opening appliance (3.2.1)
3.2.3
opening appliance
appliance (3.2.1) that can be opened

ISO/DIS 12216:2026(en)
3.2.4
hinged appliance
opening appliance (3.2.3) that is connected to its framing by hinges
3.2.5
sliding appliance
opening appliance (3.2.3) which opens by sliding in line with its area, in any plane, where the plate either
slides in a rabbet or a frame or is fixed in a sliding frame
3.2.6
appliance system
appliance comprising of a secondary appliances (e.g. portlights) situated within plates of a primary appliance
that are themselves attached to the vessel to cover an opening in the vessel envelope
3.3 Plate of an appliance
3.3.1
plate
sheet of material, transparent or not, that is attached to the craft structure either directly or indirectly, may
be fixed or opening
3.3.2
stiffened plate
plate (3.3.1) with associated structural stiffeners
3.3.3
non-stiffened plate
plate (3.3.1) not equipped with associated structural stiffeners
3.3.4
frame
a rigid structure surrounding an empty space or nonstructural panels, may be a structural stiffener of a
plate (3.3.1) , it may be attached to a plate (3.3.1)
EXAMPLE a mullion (3.9.14) is a stiffening frame
3.3.5
unsupported dimensions of a plate
clear dimensions between the inner edges of supports bearing the plate (3.3.1)
Note 1 to entry: These dimensions can be different from the opening (3.1.7) dimensions in the craft envelope, because
a plate (3.3.1) can be fixed in either a fixed or opening framing.
Note 2 to entry: See Annex B and Annex C.
3.3.6
glazing
plate (3.3.1) that is transparent or translucent
Note 1 to entry: Consider changing glazing definition given impact resistance, brittleness and safety (fragmentation
pattern), PMMA vs Glass.
3.3.7
sandwich plate
plate (3.3.1) having an inner core covered on each side by a working skin
3.4 Specific appliances
3.4.1
window
glazed appliance (3.2.1)
ISO/DIS 12216:2026(en)
3.4.2
portlight
framed window (3.4.1), fixed or opening, located in the hull or transom below deck which, where openable, is
hinged and opens inwards
3.4.3
hatch
opening appliance (3.2.3), glazed or not glazed, used for access, lighting, inspection, ventilation or reach,
located on any part of the craft envelope
3.4.4
fire escape hatch
escape hatch
hatch (3.4.3) intended or dedicated to provide an exit for people and designated means of escape
[3]
Note 1 to entry: See ISO 9094 for definitions and requirements.
3.4.5
multihull escape hatch
appliance (3.2.1) allowing a viable means of escape in the event of inversion for multihulls vulnerable to
inversion
[4]
Note 1 to entry: See ISO 12217-2
Note 2 to entry: As this appliance is not immersed in the upright and inverted position, it is usually fitted below deck
level on the hull side, nacelle or crossarm bottom, or transom.
3.4.6
door
opening appliance (3.2.3) up to 45° from the vertical intended to close a companionway opening (3.1.7)
EXAMPLE Door open at sea, door not open at sea, hinged door, sliding door.
3.4.7
deadlight
secondary watertight appliance (3.2.1), permanently attached or separate and fitted to the inside of a window
(3.4.1)
3.4.8
washboard
opening appliance (3.2.3) for companionway opening (3.1.7) made of one or more mobile board(s) that, when
closed, are stacked one on top of each other
Note 1 to entry: This device is frequently found on sailing monohulls.
Note 2 to entry: Boards are added as the weather worsens to constitute a higher sill.
3.5 Area definitions
3.5.1
appliance location area
area of the watertight envelope of the craft where the appliance (3.2.1) is fitted, if an appliance is fitted
across two areas, the most onerous area is used
Note 1 to entry: See Annex A for sketches showing examples of appliance location areas.
3.5.2
area I
lower hull sides and transom
part of the hull sides (and transom) situated above reference waterline (3.9.5), i.e. up the sheerline to its
intersection with the weather deck (for decked craft), or the upper edge of the hull (for open craft or partially
decked craft), but only to the following upper boundary:

ISO/DIS 12216:2026(en)
— a horizontal line located at the height h above waterline in the rear half of the waterline (see Figure 1);
S
— a sloped line having a height h at mid waterline, and a height 1,2h at the front end of the waterline, with
S S
— h = L /12 for sailing monohulls,
S H
— h = L /17 for motor boats, sailing catamarans and central hull of sailing trimarans
S H
where h is limited as per Table 1
S
Table 1 — h limits of area I
S
Design category h higher limit h lower limit
S S
A No limit 0,5 m
B No limit 0,4 m
C 0,75 m 0,3 m
D 0,40 m 0,2 m
Note 1 to entry: The outer hulls of sailing trimarans are considered to be entirely in area I
Key
1 area I
2 area II b
Figure 1 — Limits of areas I and II b
3.5.3
area IIa
Accessible part of deck and superstructure
All areas where persons can stand, walk or step, even inadvertently, such as decks, superstructures, cockpit
soles, at an inclination of less than 25° to the horizontal in a longitudinal direction, and at an inclination
of less than 50° to the horizontal in the transversal direction respectively for sailing monohulls, or 25° for
multihulls. Superstructure areas on which people cannot normally stand or step, are not part of area II a, but
area III (3.5.5)
EXAMPLE Top of sailcraft coachroof on which one may stand or attend to sails.
3.5.4
area II b
upper hull side and transom
areas from the hull sides (and transom) not belonging to area I (3.5.2)
Note 1 to entry: The following areas may be included if they correspond to the definition:
— rear faces of transverse girders of multihulls when located above the waterline

ISO/DIS 12216:2026(en)
3.5.5
area III
deck and superstructures exposed areas
areas, other than area I (3.5.2), area IIa (3.5.3) or area II b (3.5.4), exposed to the direct impact of sea or
slamming waves coming from front and side
EXAMPLE Top of motorcraft wheelhouse is an area on which people cannot normally or inadvertently stand or
step.
3.5.6
area IV
deck and superstructure protected areas
parts of area III (3.5.5) protected from the direct impact of sea or slamming waves coming from front and
side, and not located within L /3 from the bow
H
EXAMPLE Cockpits, rear and side faces of superstructures.
Note 1 to entry: Areas other than the ones given in the example can be included in area IV. The protection against
impact from the sea is the responsibility of the manufacturer.
3.6 Plate end-connections
See Annex B for sketches showing examples of types of plate end-connection.
3.6.1
semi-fixed plate
SF plate
plate (3.3.1) fixed to restrict deflection and to prevent lateral movement at its boundaries
EXAMPLE Unframed or framed plate, if bolted and/or glued.
3.6.2
simply supported plate
SS plate
plate (3.3.1) that can deflect at its boundaries and/or perform a lateral movement
EXAMPLE Unframed plate, whether hinged or sliding, e.g. frameless sliding windows and hatch (3.4.3), including
companionway sliding hatches, companionway ladderboards, frameless hinged windows.
3.6.3
flexibly connected plate
simply supported plate (3.6.2) where the connection is achieved by an elastic support around the perimeter
of the plate
Note 1 to entry: A car windscreen joint, shown in Figure B.3, is a flexibly connected plate where there is no overlap
between the plate and its support, hence the plate can be pushed in the craft by the outside pressure.
3.7 Types of glass
3.7.1
annealed glass
sheet glass
glass as delivered directly from the fabrication cycle without subsequent treatment
3.7.2
thermally tempered glass
TG glass
glass where better mechanical properties are obtained by thermal treatment
3.7.3
chemically reinforced glass
glass where better mechanical properties are obtained by chemical treatment

ISO/DIS 12216:2026(en)
3.7.4
monolithic glass
glass consisting of one ply
3.7.5
laminated glass
multi-layer sheet having glass as outer plies, where the inside plies are made of plastic inter-layers, plastic
sheets, glass, or other glazing (3.3.6) material.
3.8 Watertightness
3.8.1
watertightness
capacity of an appliance (3.2.1) or a fitting to prevent ingress of water inside the craft
3.8.2
degree of watertightness
capacity of an appliance (3.2.1) or fitting to resist ingress of water, according to the conditions of exposure
to water
Note 1 to entry: See Table 2.
Table 2 — Definitions of the degrees of watertightness
Degree of watertightness Definition
1 (waterproof) Constructed to withstand continuous immersion
2 (watertight) Constructed to prevent ingress of water when tested according to Clause D.2
3 (weathertight) Constructed to minimize seepage when tested according to D.2.2.1
Protection against water drops falling at an angle of up to 15° from the verti-
4 (spraytight)
cal according to D.2.2.2
3.9 Other general definitions
3.9.1
craft
small craft
recreational boat, and other watercraft using similar equipment, of up to 24 m length of hull (L )
H
[2]
Note 1 to entry: The length of hull is defined in ISO 8666 .
3.9.2
design category
description of the sea and wind conditions for which a craft is assessed to be suitable
[5] [4] [6]
Note 1 to entry: See ISO 12217-1 , ISO 12217-2 and ISO 12217-3 .
3.9.3
sailing boat
craft (3.9.1) for which the primary means of propulsion is by wind power
[2]
Note 1 to entry: See also ISO 8666 .
3.9.4
motor boat
non-sailing craft (3.9.1) upon which the main propulsion system is a propulsion engine

ISO/DIS 12216:2026(en)
3.9.5
reference waterline
WL
REF
level of the water on the hull in the fully loaded, ready-for-use condition
[2]
Note 1 to entry: The fully loaded, ready-for-use condition is defined in ISO 8666 .
3.9.6
prefabricated appliance
component that is commercially available on the open market and has been tested to conform to certain
requirements and has been marked as such
3.9.7
sill
barrier above which water can enter companionway openings and downflood the craft
EXAMPLE Hatches of cockpit companionways.
3.9.8
fixed sill
sill (3.9.7) that is a fixed, integral and permanent part of the deck
3.9.9
semi-fixed sill
closing appliance, movable but permanently installed to the craft that, when in place, constitutes a sill (3.9.7)
higher than the fixed part of the sill
EXAMPLE Hatches, sliding sills, but excluding washboards.
Note 1 to entry: A lanyard is not regarded as a permanent attachment.
Note 2 to entry: Sliding or hinged doors are considered as a mobile part of a semi-fixed sill.
3.9.10
sill height
h
S
minimum vertical distance from the top of the sill (3.9.7) to the closest part of the deck
3.9.11
minimum sill height
h min
S
minimum value of the sill height (3.9.10)
Note 1 to entry: As required by this document.
3.9.12
flush deck companionway
companionway (3.9.13) fitted on a deck without a recess
3.9.13
companionway
opening intended for crew access to the accommodation and fitted with an opening appliance (3.2.3)
Note 1 to entry: The opening appliance can be a door, a hatch; vertical, horizontal, etc.
Note 2 to entry: There can be several companionways.
3.9.14
mullion
a stiffener supporting the window
EXAMPLE the vertical frame of the window

ISO/DIS 12216:2026(en)
3.9.15
readily accessible
capable of being reached quickly and safely for effective use under emergency conditions without the use of
tools
3.10
maximum load condition
m
LDC
boat in the light craft condition with the maximum load added so as to produce the design trim, the crew
being in positions typically used when the boat is under way (e.g. within the cabin, cockpit, deckhouse or
wheelhouse) such positions being designated by the builder
4 Symbols
Table 3 — Unless specified otherwise, the symbols shown in Table 4 are used in this document
Symbol Unit Designation/meaning Ref
6.3.3
7.3
h m Sill Height
S
7.3.3
7.3.3.2
L m Hull Length 8.2.6
H
WL mm Reference Waterline 7.3.1.3.1
REF
m kg maximum load condition 7.3.1.3.1
LDC
t mm nominal plate thickness 7.2.3
is the basic plate thickness
8.2.1
t mm using allowable stress
r
8.2.2
criterion
7.3.1.1.1
Short side dimension,the
8.2.1
unsupported short side of a
b mm 8.2.5
rectangular plate or “equiv-
8.2.7
alent short side” of a plate.
8.2.11
The crown height of a
c mm 8.2.7
curved plate
d mm Diameter 8.2.5
8.2.1
is the curvature coefficient
k
c
(non-dimensional)
8.2.7
is the plate-aspect ratio co-
k efficient for stress calcula- 8.2.1
ri
tion (non-dimensional)
8.2.1
is the pressure reduction
Ψ
factor (non-dimensional)
8.2.5
p pascals is the basic design pressure, 8.2.1
p kPa Pressure 8.2.4
is the allowable flexural
σ pascals 8.2.1
a
stress of the material
t mm Equivalent thickness 8.3
eq
G N/mm shear modulus 8.3
Bending stress of the mul-
σ MPa 8.6
M
lion
Bending moment applied on
M N.mm 8.6
M
the mullion
ISO/DIS 12216:2026(en)
TTabablele 3 3 ((ccoonnttiinnueuedd))
Symbol Unit Designation/meaning Ref
I mm Inertia of the mullion 8.6
M
Longest perpendicular
distance between mullion
y mm 8.6
crit
neutral axis and the outer
skin of the mullion
Spacing of a mullion as illus-
s mm 8.6
M
trated below
Span of a mullion between
l mm 8.6
M
support as illustrated below
5 General requirements
5.1 Strength of appliances
The strength of all parts of the appliance, i.e. plates, framing, tracks and attaching (e.g. fastenings and glue)
shall meet the requirements of Clause 8.
5.2 Watertightness of appliances
To avoid flooding, all appliances shall be designed and fixed to prevent ingress of water, greater than that
specified in D.2.2 , into the interior of the craft when closed.
5.2.1 Minimum degree of watertightness
The required minimum degree of watertightness of an appliance, as fitted on the craft, shall meet the
requirements given in Table 4 which are a function of the craft's design category.
The required degree of watertightness of prefabricated appliances shall be tested before installation on the
craft using the test methods specified in Annex D.
Table 4 — Minimum degree of watertightness
Design category
Watercraft type Appliance and/or location area
A/B C D
Any Area I: lower hull side and transom 2 2 2
Sailing monohull 2 2 3
Area II (a+b)
Non-sailing +
2 3 4
sailing multihull
Any Sliding companionway hatch in areas IIa 3 3 4
Any Area III: deck and superstructure, exposed areas 3 3 4
Sailing monohull 3 3 4
Area IV: deck and superstructure, protected areas
Non-sailing +
3 4 4
sailing multihull
5.2.2 Additional requirements for appliances related to watertightness
5.2.2.1 Companionway openings of trimaran outrigger hulls
Companionway openings fitted on the decks of trimaran outrigger hulls at a height of less than L /17 above
H
heeled waterline shall not be sliding appliances.

ISO/DIS 12216:2026(en)
5.2.2.2 Non-permanently attached hatches
These appliances shall not be fitted in area I.
6 Plate materials
6.1 General
Appliance plates shall be made of
— a transparent glazing material, such as polymethylmethacrylate (PMMA), polycarbonate (PC), tempered
glass, chemically reinforced glass or laminated glass, or
— a non-transparent plate material, such as plywood (PW), glass-fibre reinforced thermosetting plastic
(GRP), aluminium alloy, steel, etc.; or
— any other material of strength and stiffness greater or equivalent to those cited above.
6.2 Acrylic sheet materials
Polymethylmethacrylate (PMMA) made with a technique other than the casting procedure shall have
mechanical properties and resistance to ageing equal to or greater than those of cast PMMA.
6.3 Glass
6.3.1 Restrictions of usage
The use of glass is restricted as per 6.3.1.1 and 6.3.1.2 for use as simply supported plates, 7.3.1 for use in
area I and 7.3.2 for use in area IIa.
6.3.1.1 Monolithic glass
Monolithic glass shall only be made of thermally tempered glass, the use of monolithic chemically reinforced
glass is not allowed.
6.3.1.2 Laminated glass
The glass plies used in laminated glass shall be made of thermally tempered glass, chemically reinforced
glass or annealed glass
7 Specific requirements of appliances
7.1 Plate end connection and location
7.1.1 Simply supported plates
7.1.1.1 Plates in area I
Simply supported plates shall not be used in area I:
— on sailing monohulls in design categories A and B, and sailing multihulls in design category A;
— on motor boats in design category A.
On other types of craft and design categories, where

ISO/DIS 12216:2026(en)
simply supported plates are used all the following conditions shall be met:
— the glazing material is PMMA or PC (see Clause 6);
— the plate thickness is not less than 1,3 times the one required by Clause 8;
— the fixing devices of the plate (hinge bolts, fixing knob, etc.) are not spaced more than 250 mm.
The above restrictions of use need not be considered if the appliance is equipped with a deadlight meeting
the requirements of 7.3.7.
NOTE Sliding appliances are also specifically covered in clause 6.3.4
7.1.1.2 Flexibly connected plates
Flexibly connected plates shall only be used on motor boats of design categories C and D in areas III and IV
(see Figure B.3.)
7.1.2 Semi-fixed plates
7.1.2.1 Plates made of material other than glass
Requirements for semi-fixed plates used in craft of all design categories and in all location areas shall be in
accordance with this clause and 7.3.
This type of end connection shall be achieved by one of the following means.
a) Connected with a counter frame: Plate edge support shall be achieved by pinching the plate at its
periphery between the craft envelope or a frame and a counter frame. The counter frame shall be
mechanically fastened and/or glued to the structure of the boat.
b) Connected by gluing: The edge fixture shall be achieved by gluing the plate at its periphery to the craft
envelope, to the structure of the craft or to a frame. This gluing shall either be in a rabbet or a face, edge
gluing or any combination of these gluing methods.
c) Connected by direct fastening: The edge fixture shall be achieved by fastening the plate inside
its periphery to the envelope, the structure of the craft or to a frame by correctly spaced and sized
mechanical fasteners. These fasteners shall be bolts, rivets, self-tapping screws or any adequate
mechanical fasteners.
NOTE Even with the best fastening system, full edge fixity of a non-stiffened plate at its periphery can never be
achieved. Plates are therefore considered at best as semi-fixed.
7.1.2.2 Plates made of glass
There shall be no contact between metal and glass.
7.2 Fastening requirements
7.2.1 Fastening of plates and frames
Plates and frames shall be fastened by mechanical means, glue or elastomer joints. All types of fastening
shall ensure watertightness of the plate or frame, and resistance to loads due to normal operating pressure.
Every part of the mechanical elements connecting appliances to the rest of the craft shall be capable of
withstanding, without breaking, twice the force induced by the pressure loads defin
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