Weber Saint-Gobain - Official website of the company


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Abrasion resistance

The resistance of a hardened mortar surface to wear by mechanical action. (ISO 7784-2) (EN 12808-2 Grouts for tiles)


A finely divided inorganic material that may be added to mortar in order to improve or achieve special properties.(EN 13318, EN 998)

Adhesion failure

Failure occuring at the interface between mortar and substrate or associated material. The value equals the adhesive strength.

Adhesion strength (bond strength)

The maximum adhesion strength of a mortar applied onto a substrate, which can be determined by shear or tensile strength test.


Organic or inorganic material added in small quantity to modify the properties of the mortar in the fresh and/or hardened state. (EN 13318, EN 998)


Granular material that does not contribute to the hardening reaction of the mortar.(EN 998)

Air content

The quantity of air included in a mortar.(EN 1015-7)

Air entraining admixture

Admixture that allows a controlled quantity of small, uniformly distributed air bubbles to be incorporated in a mortar and which remain after hardening.(EN 13318)

Anchoring mortar

A designed mortar for fixing and anchoring materials.Il can be cement or reaction resin based.(EN 1504-1)

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.


Capacity of a mortar to absorb water not under applied pressure. There is no relation between porosity and capillarity. (EN 1015-18 Masonry mortars)(EN 13888 Grouts for tiles)

Casting mortar

A fluid mortar for producing pre-cast items. Used to produce statues, balustrades, cornices, slabs, flagstones etc.

Cementitious adhesive

A mixture of hydraulic binder(s), aggregates, polymeric agents and other organic additives used to bond materials.(EN 12004)

Cohesion failure

Failure occuring within the mortar layer (where the strength of the mortar is lower than that of the substrate), or failure occuring in the substrate (where the strength of the mortar is higher than that of the substrate).

Coloured mortar

A mortar specially coloured with a decorative function.


Process of manual or mechanical treatment of fresh mortar which increases its density.(EN 13318)

Compressive strength

Maximum value of a mortar failure determined by exerting a force in compression at two opposite points.(EN 1015-11 Masonry mortars)(EN 13888 Grouts for tiles)


The fluidity of a fresh mortar.(EN 1015-3 Masonry mortars)(EN 12706 Floor levelling mortars)

Correction time (adjustability)

The maximum time interval during which adjustment is possible without significant loss of final strength.(eg. correction of bricks or tiles after application of the mortar).(EN 1015-9 Masonry mortars)(EN 12004 Tile adhesives)

Crack bridging

Ability of a mortar to span dynamic or static cracks.(EN 13318)

Damproofing mortar (renovation mortar)

A designed mortar for use on moist walls containing water soluble salts.(EN 998-1)

Decorative coat

The final coat of a multicoat rendering or plastering system.(EN 998-1)


Capacity of a hardened mortar to be deformed by stresses without destroying its structure. This characteristic can be evaluated by the modulus of elasticity which is measured in dynamic or static terms.(ISO 5271 + 2)

Designed mortar

A mortar whose composition and manufacturing method is chosen by the producer in order to achieve specified properties (Performance concept).(EN 998)

Dispersion adhesive

A polymer based adhesive used for bonding materials.(EN 12004)

Dispersion based mortar

A mixture of organic binding agent(s) in the form of an aqueous polymer dispersion, organic additives and mineral aggregates and/or extenders.The mixture is ready to use.


The mortar resistance to chemical, mechanical and climatic conditions which comprise its effective life.


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)

Expanded clay

Lightweight granular material used for insulation purposes having a cellular structure formed by expanding clay minerals by heat.(EN ISO 9229)

Factory-made mortar

A mortar batched and mixed in a factory. It may be dry, which is ready mixed only requiring the addition of water, or wet, which is supplied ready to use.

Finish coat

A render consisting of mineral and/or organic and/or inorganic materials forming the final coat of an EWI system.

Flexural strength

Maximum value of a mortar failure determined by exerting a force in flexure at three points.(EN 1015-11 Masonry mortars) (EN 13888 Grouts for tiles)

Flowing screed

Screed made with self-levelling properties of a flooring mortar.(EN 13318)

Fresh mortar

A mortar completely mixed and ready to use.

General purpose mortar

A mortar which satisfies general requirements, but is without special characteristics.It can be produced as prescribed and/or designed mortar.(EN 998-1)

Glass fibre

Fibre manufactured as continuous filament from molten glass, normally used for reinforcement, tissue or textiles.(EN ISO 9229)

Grouting mortar

A fluid mortar used for grouting cavities, voids or joints between materials.

Gunite mortar

A dry or semi dry mortar for dry spray application. (Gunite technique).Used for reinforcement and related works.

Hard aggregate

Aggregate with high abrasion resistance.(EN 13318)

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.

Hydraulic mortar

A mortar containing a mineral hydraulic binder which hardens with water.


Resistance of a mortar to penetration of water, under a certain pressure.

Injection mortar

A fluid and/or thixotropic designed mortar to fill cracks or cavities.Applied by injection under pressure and can be cement or reaction resin based.(EN 1504-1).

Levelling mortar

A designed mortar for levelling floors or screeds to obtain a flat and smooth surface.It is mainly used for flooring on horizontal surfaces.

Lightweight mortar

A designed mortar with a dry density below 1.400 kg/m3.(EN 998)

Masonry mortar

A mix of one or more inorganic binders, aggregates, additives and/or admixtures, used for laying masonry units. It can be a thick or thin layer. (EN 998-2)

Maturing time

The interval between the time when a mortar is mixed and the time when it is ready to use.(EN 12004)

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 coating

A coloured factory-made mortar based on mineral binders (cement, lime, gypsum...) for the protection and decoration of vertical surfaces.

Mineral rendering/plastering mortar

A mix of one or more inorganic binders, aggregates, and sometimes admixtures and/or additives, used as external renders or internal plasters.(EN 998-1)

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)


A mix of one or more inorganic or organic binders, aggregates, fillers, additives and/or admixtures.

Multi-component mortar

A mortar with separate pre-batched components (eg. powder + liquid) to be mixed together on site.

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)

Open time

The maximum time interval for finishing after application of a mortar.(EN 1346 Tile adhesives)(EN 12189 Concrete repair mortars)

Paving mortar

A mortar laid under paving slabs or blocks.


Lightweight granular material used for insulation purposes manufactured from naturally occurring volcanic rock expanded by heat to form a cellular structure.(EN ISO 9229)

Plasticising admixture

Admixture which, without affecting the consistence, permits a reduction in water content of a mortar, or which, without affecting the water content increases the flow, or which produces both effects simultaneously.(EN 13318)

Plugging mortar

A mortar to stop water leaks.Normally very fast setting.

Pointing mortar

A mortar to point between masonry units.This is called a grout when used for ceramic tiles.

Polymer based coating

A coloured polymer-based dispersion mortar for protection and decoration of vertical surfaces.

Polymer render/plaster

Render/plaster with polymer as the principle binder.


Ratio between the volume of pores within the mortar and the total volume.(EN 1015-7)

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).

Premixed lime-sand-mortar

Constituents batched and mixed in a factory, supplied to the building site where further constituents specified or provided by the factory are added (e.g. cement).

Prescribed mortar

A mortar made in pre-determined proportions, the properties of which are assumed from the stated proportion of the constituents (Recipe concept).(EN 998)

Reaction resin adhesive

A two part resin based mortar used for bonding materials. (EN 12004- Adhesives for tile adhesives)(EN 1504-1 Structural adhesives)

Reaction resin mortar

A mixture of synthetic resin, mineral extenders and/or aggregates and organic additives which hardens by chemical reaction.The pre-batched components are packed ready to mix together.(EN 12004)


Wires, meshes or fibres added to mortars or material incorporated within a render or system to improve its mechanical strength.(EN 13318, EN 13500)

Render/plaster coat

A layer applied in one or more passes of the same mix, with the previous pass not being allowed to set before the next one is made (i.e. wet on wet).(EN 998-1)

Rendering/plastering system

A sequence of coats to be applied to a substrate which can be used in conjunction with a support and/or reinforcement and/or a preparation treatment.(EN 998-1)

Repair mortar

A designed mortar for repair or replacement of defective concrete. It can be ¿structural¿ (contributing to the strength of the construction) or non-structural.(EN 1504-1)

Restoration mortar

A designed mortar for the reconstitution or repair of natural stone masonry.


Admixture for mortar which delays the beginning of hardening.(EN 13318)

Roofing mortar

A mortar for fixing and pointing roof tiles and for related works.


Characteristics of the texture of the mortar surface.


Layer of mortar laid in situ, directly onto a base, bonded or unbonded, or onto an intermediate layer or insulation layer to produce a defined level, to carry the final flooring to provide a wearing surface.(EN 13318)

Screed mortar

A mortar with which to carry out floor screeding.


The capacity of a fresh mortar to spread out naturally to form a flat surface.


The capacity of a liquid fresh mortar to form a smooth surface itself.

Semi-finished factory-made mortar

Prebatched mortar or premixed lime-sand-mortar.

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)

Shear strength

Strength determined by a force applied parallel to the mortar surface.(EN 1322 Dispersion and reaction resin adhesives, EN 12615 Concrete repair mortars)

Shelf life

The time of storage under stated conditions during which a mortar may be expected to retain its intended working properties.(EN 12004)


Volume reduction of an unrestrained mortar du-ring hardening.(EN 12808-4 Grouts for tiles)

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.

Site-made mortar

A mortar composed of primary constituents (e.g. binder, aggregates, water) batched and mixed on the building site.


Capacity of a floor wearing surface to provide friction to resist slipping by foot or wheeled traffic.(EN 13318)

Smoothing mortar

A designed mortar for the finishing of a substrate to obtain a plane and smooth surface.It is used for walls and ceilings.


The exposed horizontal undersurface of a part of a building.(EN 13499)


Immediate surface to which the mortar is to be applied. In the case of a coating to be applied to an existing render, the render would be the coating's substrate.


Admixture which, without affecting the consistency, permits a high reduction in the water content of a mortar, or which, without affecting the water content, increases the flow or which produces both effects simultaneously.(EN 13318)


Material used to support the render/plaster so that it is largely independent of the substrate.

Surface hardness

The resistance of the surface of a hardened mortar to indentation by a loaded steel ball.

Tensile strength

Resistance of a mortar surface, to resist a tensile force, applied perpendicular to the mortar surface.(EN 1348 ¿ Cementitious adhesives, EN 1015-12 Rendering/plastering mortarsEN 12636 Concrete repair mortars)

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 insulating mortar

A designed mortar with specific thermal insulating properties.(EN 998-1)

Thermal insulation adhesive

Material for bonding the thermal insulation material of an ETICS to the substrate.(EN 13500)

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)


The change of consistency of a fresh mortar when energy is applied as for example by stirring or shaking.

Transverse deformation

Deflection recorded at the centre of a mortar, when a beam is subjected to three point loading.(EN 12002 Cementitious adhesives and grouts for tiles)


The lower coat (or coats) of a system.(EN 998-1)

Undercoat mortar

The lower coat(s) of a rendering/plastering multi-coat system. It is normally covered with a finish coat.(EN 998-1).


VermiculiteInsulation material which results from expanding or exfoliating natural mica by heating.(EN ISO 9229)

Water retentivity

The ability of a fresh hydraulic mortar to retain its mixing water when exposed to substrate suction.(EN 1015-8)

Water vapour permeance

Water vapour passing per unit area of mortar, under steady state conditions, per unit difference in water vapour pressure.(EN 1015-19)

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).

Wetting capability

The ability of a fresh mortar to wet the substrate or an associated material to facilitate its adhesion.(EN 1347)


The sum of the application properties of a mortar which give its ease of use.(EN 1015-9)


Saint-Gobain Weber

30 Bosworth Street
Alrode Ext. 4

Switchboard: +27 (11) 617 8500
Call Centre: 08600 WEBER (93237)
Fax: 086 550 7118
E-mail: info(at)