Estonian producer of construction materials since 1910

Construction block 240 Silence


Silicate products are made of lime and quartz sand and have been hardened in an environment of highly pressured steam. Appreciated by builders as a weather and fire resistant, soundproof and very durable material.

Silicate blocks are desinged for building load-bearing walls and partitions. Compressive strenght M20 means that walls designed for higher loads can be built. The block made of heavy materials complies with higher quality standards: soundproof, fire resistant, heat insulating, frost resistant. An added value of this block is its economy – a high quality result can be achieved with lower costs. The sides of the block have a peg-groove connection, which enables building walls without filling transversal joints. Such a construction significantly reduces expenses on mortar, transport and time needed for masonry!

Construction block 240 Silence

Strong wall

Bigger loads (water boiler, TV-systems etc.) can be attached to walls made of blocks with a compressive strenght of 20MPa.

High noise insulation

The air noise insulation index of silicate block 180 is 52dB. The noise insulation index of a 240mm silicate block is 55dB – perfect for partitions in apartment buildings and other buildings that require a quiet environment.

Energy efficient building

The U value of an insulated wall is 0.13-0.17 W/m²K. NB! Buildings with an exterior wall made of silicate block do not need air conditioning in the summer.

Convenient cable installation

The hollows in the block enable installing cables inside the structure.

Fast and easy masonry

A special jaw makes it easy to place the blocks directly next to each other.


The peg-groove connection enables building a wall without filling vertical joints. The wall does not need to be reinforced and grouted from the inside – plastering and paint is enough. Basic reinforcement is enough.

Technical specifications

Measurements (lenght, width, height) 250mm, 240mm, 192mm
Measurement tolerances T3
Compressive strength (average) per gross area ≥ 20 N/mm2
Normalized compressive strength ≥ 20 N/mm2
Fire resistance A1
Water absorption < 15 % (according to mass)
Water vapour diffusion factor (table value) 5/10
Gross dry density 1400 - 1500 kg/m3
Equivalent thermal conductivity 0.56 W/mK
Frost resistance F2
Fire resistance class REI240
Sound insulation R'w 55 dB
Weight 16 kg



The same principles apply to building a wall out of hollow silicate blocks as for using other silicate bricks. The base constructions (footing and foundation) must be level, stabile and strong. Proper water insulation must be installed onto the foundation so that the humidity that permeates the foundation would not spread into the walls. The blocks must be moistened before laying and masonry mortar with the right consistency used. In order to create proper adhesion between the mortar and stone, the mortar must not be too dry. In case of a too runny mortar, the mixture will pour out from the joints and the mixture might not achieve the necessary strength. Using a more liquid mixture will not compensate for the need to moisten the stones. The more fine-grained the mixture is, the more convenient it is to work. In hot and dry weather, the wall must be stopped from drying too quickly. Silicate bricks cannot be used for foundations or load-bearing basement walls. Silicate walls must not be covered with something that prevents drying. The wall may be painted with a paint that has a very good water vapour permeability.
It is recommended to begin building the wall from the corner. It is convenient to place the mixture onto the blocks using a mortar ladle or sled runner as it ensures that the mortar is evenly spread and the joints are even.
A very helpful tool for handling and placing blocks is a jaw. It significantly speeds up work and needs less workers. A dead-blow rubber hammer with lead millet can be helpful in nudging the blocks to the exactly right place.

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Cutting blocks

A good tool to use for curring corner and end pieces (and all silicate bricks in general) is a disc cutter and a normal stone cutting disc.
The precision of cutting the corner and end pieces affects the mortar quantities needed. The wider (more imprecise) vertical joints are, the more mortar is needed. Building from silicate blocks involves needing more mortar than when building from smooth bricks. As the lower part of the block has cavities, the weight of the block pushes some of the mortar inside the cavity. However the mortar in the cavities increases the shear strength of the structure.


In the case of blocks, vertical joints do not have to be filled with mortar as the pegs (grooves) on the ends of the blocks fit together perfectly. If desired, a polyurethane foam that expands little can be used for connecting transversal joints. The foam should be applied to the groove of a block already in place before placing the next block.

Bridging openings

The weight of the block rows above windows and doors is distributed to both sides of the opening using lintels. Reinforced concrete lintels are most suitable for a silicate block wall. The type of the lintel (measurements, reinforcement, load bearing capacity, lenght)is determined by the designer. There as to be an uncut block/brick under the footing of the lintel. In case of openings of more than 1.5m, the minimum bearing surface under one end has to be at least 250mm.

When installing lintels and floor panels, it should be made sure that the lintel or panel would be supported on at least half the block or it should be done based on the requirements set in the project. Casting a concrete belt has to be based on the principles of concrete casting. Ass silicate blocks have two cavities that pass through the block, it has to be taken into account that concrete will pour into these openings. Therefore some extra concrete is needed. To reduce the amount of concrete used, the cavities may be filled half or three quarters up with assebly foam.
In the case of silicate blocks, a good tool to attach scaffolds and fixtures are dowels.

Expansion joints

The purpose of expansion and temperature joints is to prevent cracks caused by reduction of volume in long sections of the wall or changes in temperature. The joints are vertical and pass through the wall. These are filled with an elastic filler, which is why the separated parts of the wall can move in relation to each other without damage. The recommended distance between two expansion joints is 10 m.


In case of correct masonry, interior finish can be limited to complete plastering. When the joints are correct, just paint may be sufficient. If additional sound insulation is necessary or the masonry is not so well executed, walls can be covered with 10mm of plaster in both sides.


As a rule, a silicate block wall is so strong that it does not need reinforcement. There are still four regions that need constructive reinforcement to prevent cracks.
Be sure to reinforce:

  1. On top of the first row of blocks (it prevents tensions spreading from the foundation into the wall)
  2. Under the last row of blocks (helps to spread the load of the roof to the wall)
  3. Under the row of blocks under openings (spreads the load of window posts to the wall)
  4. Under the row of blocks of a lintel (reduces temperature expansion and spreads the load to window posts)

Suitable reinforcements are reinforcement net (in case of mortar) or Murfor EFS reinforcement (in case of using block glue).

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!

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