Glossary of External and Internal Thermal Insulation Terms

Basecoat mortar
(of ETICS)
Layer applied directly onto the background / the thermal insulation material. It contains the reinforcement. The basecoat provides most of the mechanical properties of the system. (EN 13500+13499)
Bedding mortar A designed mortar used for grouting to bed machines or materials. It can be cement or resin- based. (EN 1504-1).
Bonding mortar A mortar to produce a first bonding coat in a multicoat system. It is usually applied in a thin coat.
Coloured mortar A mortar specially coloured with a decorative function.
Decorative coat The final coat of a multicoat rendering or plastering system.(EN 998-1)
Durability The mortar resistance to chemical, mechanical and climatic conditions which comprise its effective life.
Efflorescence Crystallisation of salts on the surface of a mortar.(EN 13318)
ETICS : External thermal insulation composite system Site applied system of factory made pro-ducts comprising, as a minimum, adhesive mortar and/or mechanical fixing devices, thermal insulation material, one or more layers of a base coat, reinforcement, finishing coat. The components are inseparable.(EN 13500+13499)
Finish coat A render consisting of mineral and/or organic and/or inorganic materials forming the final coat of an EWI system.
Glass fibre Fibre manufactured as continuous filament from molten glass, normally used for reinforcement, tissue or textiles.(EN ISO 9229)
Hardening time The time during which the mortar develops strength. This time generally corresponds in practice to the time after which load may be applied to the element.
Impermeability Resistance of a mortar to penetration of water, under a certain pressure.
Lightweight mortar A designed mortar with a dry density below 1.400 kg/m3.(EN 998)
Mechanical fixing devices Devices for mechanically securing thermal insulation boards to the substrate. (e.g. rails or anchors).Devices for mechanically securing thermal insulation boards to the substrate. (e.g. rails or anchors).Devices for mechanically securing thermal insulation boards to the substrate. (e.g. rails or anchors).(EN 13499)
Mineral wool Insulation material having a woolly consistency manufactured from molten rock, slag or glass.(EN ISO 9229)
Monolithic application Application of a new layer of mortar directly onto the preceding one before the latter has finished setting.(EN 13318)
One-coat mortar (Monocouche) A designed rendering mortar applied in one coat which fulfills both the functions of weatherproofing and decorative appearance of a ¿multicoat¿ system.It is usually coloured.(EN 998-1)
Polymer based coating A coloured polymer-based dispersion mortar for protection and decoration of vertical surfaces.
Pot-life (working time) Period of time during which, after mixing, a mortar remains suitable for use.(EN 1015-9).
Prebatched mortar Constituents batched in a factory, supplied to the building site and mixed there according to the manufacturer's specification and conditions (e.g. multi silo mortar).
Reinforcement Wires, meshes or fibres added to mortars or material incorporated within a render or system to improve its mechanical strength.(EN 13318, EN 13500)
Roughness Characteristics of the texture of the mortar surface.
Setting time The time after which the mortar begins to harden. After this time the mortar is normally stable in the presence of water.(EN 1015-4)
Shelf life The time of storage under stated conditions during which a mortar may be expected to retain its intended working properties.(EN 12004)
Silicate coating Mineral render/plaster with potassium silicate as the principal binder. It hardens by evaporation of the water and solidifies under the action of carbon dioxide from the air.
Surface hardness The resistance of the surface of a hardened mortar to indentation by a loaded steel ball.
Thermal conductivity The value (l ) of a mortar in the dry state.The l-value is related to the density of the hardened mortar. (EN 1745)
Thermal insulation material Material which is intended to reduce heat transfer and which derives its insulation properties from its chemical nature and/or its physical structure. (EN ISO 9229)
Thin layer masonry mortar A designed masonry mortar for joints between 1 mm and 3 mm thick. (EN 998-2)
Undercoat mortar The lower coat(s) of a rendering/plastering multi-coat system. It is normally covered with a finish coat. (EN 998-1).
Waterproofing mortar A designed mortar which prevents water penetration in a substrate, under a stated pressure.
Weatherproofing mortar A mortar which resists rain penetration and protects the substrate from weather.(e.g. external rendering and one-coat mortars are weatherproof).

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