Estonian producer of construction materials since 1910

Masonry mortar M10


Silikaat’s masonry mortar M10 is a cement based general purpose masonry mortar. Suitable for laying walls of fire bricks, silicate bricks, expanding glay and concrete blocks – a dry mixture to which only water is added. Also suitable for building chimneys and fireplaces. Can be used both indoors and outdoors.

In load-bearing walls the main purpose of the mortar layer s to carry the load onto the bottom row of bricks. To carry the loads as much as possible, joints have to be well filled and mortar has to archieve very good adhesion to the bricks. This also ensures that the structure is soundproof. We offer masonry mortar M10, with a compressive strenght of 10 N/mm2. The suitable strenght class for load-bearing walls is found by calculations. Should the joints be reinforced, adhesion has to be ensured between the mortar and the reinforcement, and the mortar and bricks.

Composition: cement, quartz sand (0 – 2 mm), limestone filler.

Masonry mortar M10

Technical specifications

Compressive strenght M 10
Adhesion ≥ 0,3 N/mm2
Reaction to fire A1
Water absorption ≤ 0.5 kg/(m2∙min0.5)
Chloride content ≤ 0.02 %
Frost resistance 50 cycles
Yield (25 kg) 14...15l
Period of use Up to 4 hours


Preparing the mixture

Mix the contents of the masonry mortar M10 25 kg bag with 4 – 4.5 litres of clean water. The mixture has to be mixed until completely moistened. The amount of water added cannot be exceeded. The amount of complete mixture is 14-15l. The mixture can be used for up to 4 hours. The amount of mortar needed to build a wall half a brick wide is shown in the table.

When mixing the masonry mortar mixture, the quantity of water added is very important. Adding too little water means that the mixture is too solid and it is difficult to work with the mortar. Also adhesion might not be sufficient. A too liquid mixture tends to flow down the exterior of the structure. Also strenght might be lost if the mixture is too liquid. When mixing the masonry mortar, it is good to leave it for about 10 minutes after initially adding the water and mixing (5-8 minutes) and then to mix it again. Only this way we can ensure that all components are mixed evenly.

Executing the work

Before masonry work begins and during it, all parts of the construction which may be damaged during the masonry work have to be protected. The base for the structure has to be strong and stablile. The surface has to be clean of grease, soot, dust, salts and other such substances that disrupt adhesion. Adhesion of the mortar is not ensured if you use masonry materials that are too moist or too dry. It is recommended that you moisten (silicate) bricks before use to avoind that the masonry mixture dries immediately onto the structure’s surface or onto the mortar bed prepared for the next brick. If the masonry mortar dries too quickly, it reduces the adhesion between the mortar and the brick, and the chemical drying processes within the mortar are not complete. This is firstly visible as a hairline fracture between the mortar and the brick, which will begin collecting moisture from percipitation, which in turn will freeze and break up the structure. After years go by, such a small fracture may create a visible crack and also the bricks may start to crumble. Nor fixing such a crack causes a risk of percipitation water getting into the structure and behind it, which in turn can damage the construction of a load-bearing wall. During masonry work, a suitable quantity of mortar is placed on the structure based on its width so that when pressing the brick into place, the joint could be filled. Tapping onto the brick with the trowel handle can be used as a final finish. After adhesion, bricks must not be moved. A half-finished structure has to be protected from rain and other risk factors. In hot and dry weather, the structure has to be stopped from drying too quickly by watering it with clean water. Mortar splatter must be removed from the wall before it sets.

Pointing joints

Uniform joints create a unifrom wall pattern on the facade, which is particularly important for clean joint structures. For maximum load trasnfer and to achieve a nice wall pattern, all joints must be completely filled (no gaps) and the surface of the joint finished. The gaps on the surface weaken the load-bearing surface, spoil the appearance, make it possible for percipitation water to enter deep into the structure, and then break the construction of the whole structure when freezing. The surface of masonry mortar (joint) is finished after it has become dirt-dry, i.e. does not stick any more. When finishing a sticky surface, we run the risk of the facade surface becoming dirty, but a surface that is too dry cannot be evened out. Technologically a difference is made between convex, concave and smooth (even) joints, which are made with a special pointing iron. NB! Joints are not pointed with a finger or the trowel handle. After the joints have dried, the facade surface is brushed clean of mortar residue using a hard brush.

Practical advice

Masonry mortar can be used at temperatures +5 …+30°C. At temperatures under 10°C, the drying-hardening processes of the mortar slow down. At 0°C the free water in the mortar freezes and the hardening process in stops, i.e. the structure freezes through. Therefore it is dangeroud when a structure built in the winter is not checked before it is loaded as in the spring, when the wall melts, the loaded wall may just collapse. In order to avoid freezing when masonry work is carried out in the winter, a masonry mixture with a winter-additive developed by the manufacturer must always be used. At temperatures below -15°C it is reasonable to suspend masonry work as the energy expenditure of the mason and the energy used for the work (warming up the structure) exceed reasonable expenses. It is important that the surfaces and bricks worked with would be free of ice and snow.

Safety precautions

May irritate eyes, airways and skin. Avoid inhaling the dust and the mixture being in contact with the eyes. Should the mixture get into contact with eyes, clean the eye with plenty of water and turn to a doctor, if necessary. We recommend using protective eyewear, a respirator, gloves or a protective cream.

Packaging and storage

Silikaat masonry mortar M10 is available in bags of 25 kg and 1 ton. Store on a pallet and keep away from humidity!

The dry mixture has the best properties for up to 12 months after being packaged.

Reminders for masonry work

  • The basis of the structure must be strong and stabile!
  • The base has to be clean from grease, soot, dust, salts and other substances that reduce adhesion!
  • After adhesion, the bricks must not be moved!
  • In dry and hot weathers, the wall needs to be watered with clean water so that it does not dry up too quickly!
  • Mortar splatter has to be removed from surfaces before it sets!
  • Joints are finished when the mortar has set enough!

Product info PDF

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