What is Cinder Block Construction


Cinder block: different types

Dimensions of the cinder block: according to the type of wall

Cinder block: construction stages

Price of the cinder block: $40 per m² all included

The cinder block is the most used concrete block in contemporary construction. It is an economical, practical, and reliable concrete block that can build load-bearing and non-load-bearing walls, from the facade to the fence wall. A concrete wall can also be made with aerated concrete.

Concrete blocks: different types

A detached house can be built entirely out of cinder blocks.

The structure of the blocks can be solid, perforated, or honeycombed.

For each use, there is an adapted cinder block:

– U blocks: for horizontal and lintels,

– corner blocks: for vertical chaining,

– plank blocks: for floor ends.

In the standard model, the cinder block is usually hollow or made of light aggregates.

Here is a comparative table of the different types of cinder blocks and their use:





Hollow block

Common walls: gables, facades, etc.


– 2 hollow ends for vertical joints.


– Can be cut in thirds.

Corner block

Vertical chaining.


– 1 smooth end, 1 hollow end for the joint.


– 1 square or 1 round hole for the passage of the vertical chaining.


– Can be cut to the third.

Lintel block


– Installation of the lintel.


– Horizontal chaining.

U shape.

Jamb block


– Bay paintings.


– Corner


– Alveoli allowing to cut it in 2.


– 1 flat and smooth end, 1 hollow end for the joint.

Perforated block / Solid block


Solid, and it can be buried.

Block to be laid


– Lost formwork.


– Retaining wall


– H-Shape, allows the insertion of frameworks.


– The concrete is poured directly into the cells.

Dimensions of the cinder block: as per wall type

The standard dimensions of the cinder block are as follows:

– L: 20 cm,

– H: 25 cm,

– l: 50 cm.

The thickness is variable from 5 to 32.5 cm: it depends on the type of masonry for which it is intended.

In addition to the standard cinder block, there is also a rectified cinder block where:

– the dimensions are rigorous,

– the interlocking of the sides makes it possible to dispense with vertical joints,

– the horizontal joint is reduced to 3 or 4 mm (normal joint 10 to 15 mm).

The dimensions of the blocks are to be chosen according to the type of wall:




Bulkhead and counter-bulkhead


5 cm,

7,5 cm,

10 cm.

Height: 20 cm,

Width: 40 cm or 50 cm.

Facade and splitting wall

Thickness :

15 cm,

20 cm.

Width 40 cm or 50 cm

Cinder block: construction stages

The assembly of a wall and, more simply, of a cinder block wall is classic.

It does not represent significant difficulties, but it is necessary to be rigorous:


Step 1. 

To do:

    • Ground location of the low wall on the foundation.
    • Lay cords to serve as an installation guide.


The installation of the first row is crucial; it must be perfectly linear and plumb.

Step 2.

To do:

    • Lay mortar on the foundation, about 1 cm thick.
    • The mortar is laid from one end and is the size of a cinder block.


Use a thin or medium mortar.

It depends directly on the type of wall.

Step 3.

To do:

    • Place the first cinder block on your floor alignment along the cord.
    • Position it with the sledgehammer and check the plumbness with a level.


Take your time to check the plumbness.

Step 4.

To do:

    • On the other end of the future wall, place a new cinder block according to steps 2 and 3.


Always check the level, alignment, and plumbness.

Step 5.

To do:

    • With your first 2 cinderblocks in place, 1 at each end, make a template using 2 cleats and 4 nails the size of a cinderblock width. Place the 2 templates on the 2 blocks at each end and pull 1 cord on the outside


The cord is used to check the vertical alignment.

Step 6.

To do:

    • Between the 2 blocks, place mortar over the entire length and about 1 cm thick.


To avoid overflowing on the outside when removing the mortar, use a planer that you place vertically on the string.

Step 7.

To do:

    • Place the cinder blocks on the mortar, edge to edge.


Check each block for alignment, level, and plumbness.

Step 8.

To do:

    • Fill the vertical joints.


Fill widely.

Step 9.

To do:

    • With the first row down, start the second row:

either by a cinder block cut in two if your wall is straight,

or by a cinder block laid in staggered rows if your wall has a corner at each end.


If you need to cut a cinder block in half, use a sledgehammer to cut it at the cell level.

You can then cut it to the desired size, still using the sledgehammer.

Step 10.

To do:

    • Place the second row of cinder block, taking care to raise the jigs one level.


The templates are placed on the 2 blocks at the 2 ends of the second row.

Price of the cinder block: $40 per m² all included

The indicative price of the cinder block is $40.

Prices are based on an average excluding tax, supply, and labor included for one square meter.

They may vary according to regions and professionals.

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