REDUNDANCY: In engineering, redundancy is the intentional duplication of critical components or functions of a system with the goal of increasing reliability of the system, usually in the form of a backup or fail-safe, or to improve actual system performance. (Wikipedia) SERVICEABILITY : The capability of a building, assembly, component, product or construction to perform the function (s) for which it is designed and used. (Journal of Cleaner Production, 2019) SERVICE CLASS: A system used in timber engineering standards to specify environmental conditions: surrounding temperature and humidity which affect levels of moisture in timber exposed to these conditions. (TRADA, Moisture and humidity,2016 EN 1995 1-1) SERVICE LIFE: Period after installation during which a building, or its part, meets or exceeds the performance requirements. (“Home Quality Mark One, Technical Manual SD239, England, Scotland & Wales, BRE, 2018”. The actual time during which the building or any of its components performs without unforeseen costs or disruption for maintenance and repair. (CSA S478)) USE CLASS: Defined by British and European Standards, providing a guide to the risk of decay and insect attack to timber components, depending upon their end use. The higher the Use Class, the higher the level of preservative protection required. (BS EN 355:2012) USEFUL LIFE (OF A BUILDING): Amount of time an asset is expected to be functional and fit-for-purpose. With regard to a building, useful life can be defined as the number of years before the building deteriorates to the point that it is no longer safe or desirable for continued use, the point at which it no longer meets existing code requirements and would be too costly to bring up to code, the point in time at which other uses for the building site are more financially viable than keeping the existing building in place, and so on. (Circularity Concepts in wood Construction. Unece.org)
gluing, and finishing of wood and its mechanical, thermal, and acoustic properties are all influenced by moisture content. MOISTURE: The humidity which, as a result of unforeseen events, leads to an increase in humidity in wooden components. Causes can be weathering during the construction phase, increased building moisture or convective moisture entry through leaks in the building envelope. MOISTURE CONTENT (MC): The term ‘moisture content’ (MC) refers to the amount of water contained in the pores (voids) of a material. It is usually expressed as the percentage by mass of the water present relative to the material’s dry weight. (designingbuildings.co.uk) MOISTURE MANAGEMENT: All activities that are undertaken both to prevent moisture from entering a structure where it may cause damage as well as designing a structure to withstand unwanted moisture. Since moisture originates from various sources, such as built- in moisture from manufacturing, transport and storage of building materials; moisture loads from occupants and the surrounding air; outdoor climate, rain, snow, etc, it consequently affects all stages of building and maintenance. (OBERG, A., WIEGE, E., Moisture risks with CLT-panels subjected to outdoor climate during construction, 2018) RELATIVE HUMIDITY (RH) : A measure of the water vapour density of air compared to the water vapour density for saturated air at the same temperature and pressure (maximum amount of moisture that air can ‘hold’ at that temperature and pressure). (designingbuildings.co.uk) RECOVERABILITY / REPAIRABILTIY: Measure of the degree to and ease with which a product can be repaired and maintained, usually by end consumers. (Wikipedia) RISK FACTOR : A characteristic used in a risk model as an input to determine the level of risk in a risk assessment. (NIST Special Publication 800-39)
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