DEFINITIONS
Compartment (fire) 2 A building or part of a building, comprising one or more rooms, spaces or storeys, that is constructed to prevent the spread of fire to or from another part of the same building or an adjoining building. Compartmentation 2 A means of preventing the spread of fire within a building and providing adequate means of escape by containing it in the compartment of origin. Designer An organisation or individual who prepares or modifies a design or who arranges or instructs any person to do so. HSE CDM Designers hse.gov.uk/construction/cdm/2015/designers.htm Dewpoint 1 Temperature at which air becomes saturated with water vapour. Fire classification Reaction to fire classification is determined in accordance with BS EN13501-1 Fire classification of construction products and building elements - Part 1: Classification using data from reaction to fire tests. This considers how a product or element behaves in the early stages of a fire (ignition and growth), and how a material might contribute to the development of that fire (ignitability and combustibility). The classification standard details the test methods used, and performance levels expected to achieve a reaction to fire classification. The classification system has seven classes from A1 (products that do not contribute to the development of a fire) to F (products with no performance criteria claimed). Fire resistance classification considers the ability of a system to resist the effect of a fully developed fire, and prevent the passage of fire through a wall/ floor, and/or the ability to keep structural integrity. Fire resistance classification is determined in accordance with BS EN13501-2 Fire classification
Assessment A technical evaluation of the likely performance of a component or element of structure (as defined in Approved Document B and equivalents in Scotland, Wales and Northern Ireland) if it were to be subjected to a relevant standard fire test. An assessment may consider design changes to a tested element of construction for a specific project, or it could form a wider scope of approval with a defined period of validity. Assessments, based on sufficient relevant test evidence, provide a defined scope of approval for a particular design or range of designs. They form an opinion of the likely performance of a component or element of structure if it were to be subjected to a standard fire test. AVCL 1 Air and vapour control layer – a continuous layer of impermeable material. Breather membrane A membrane with water vapour resistance greater than 0.25 MN·s/g and less than 0.6 MN·s/g. Building control body (BCB) 3 The body responsible for enforcing Building Regulations on a project and assisting with compliance by giving feedback on plans and providing site inspections. This may be a local authority building control officer or an approved inspector. Cavity barrier 2 Construction within a cavity, other than a smoke curtain, to perform either of the following functions: • Close a cavity to stop smoke or flame entering • Restrict the movement of smoke or flame within a cavity. CDM Regulations 2015 2 Regulations intended to protect persons from health and safety risks from construction work through a systematic framework for the management of those risks.
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