Concrete Cover Block

A concrete cover block is molded plastic or metal installation device or tool used for accurate masonry unit placement.

Concrete block wall systems are simple to install for anyone with a minimum level of skill.

In this article you’ll learn about concrete cover block in detail with types, advantages & disadvantages.

So, let’s dive right in.

What is Concrete Cover Block?

The concrete cover block is the little pieces of concrete that are used to ensure that reinforcement (i.e., steel) is positioned correctly with a specific concrete cover.

Concrete covers are included in RCC constructions including slabs, beams, columns, and footings to ensure the structure’s longevity.

The concrete cover measures the shortest distance possible between the outer surface of the concrete and the surface of any embedded reinforcement, such as steel.

For various structural elements, the concrete cover ranges from 15 to 50 mm.

Concrete Cover Block

Purpose of Concrete Block:

  • A concrete cover block purpose is to simplify masonry building.
  • To install brick masonry units would eliminate the requirement for trained masons to install concrete masonry units using a tried-and-true procedure.
  • In addition to raising construction productivity, it also raises construction quality.

Types of Concrete Cover Block:

1. Single Cover Block:

They are the simplest form of spacers with covers in a variety of sizes.

For one type of RCC construction with particular cover distances, they can be applied.

If 15mm cover blocks are produced to cover slabs, then you must only use them on slabs that require 15mm cover.

2. Multiple Cover Block:

These spacers are available in a range of sizes.

They might have two or more sizes that can be used for various RCC members to offer the concrete covers that are needed for each of them.

A multi-cover spacer can be used on slabs or beams of different sizes with diameters of 20mm and 25mm.

3. Circular Block:

These particular spacers have a hole in the centre or many apertures for inserting rebar, which needs to be covered with concrete.

They are the best kind of spacers for columns of various sizes.

4. Bar Cover Block:

Heavy-duty buildings like tunnels, bridges, retaining walls, etc. employ these kinds of spacers.

Where there is a tighter spacing between the two bars and a larger rebar diameter.

They can have any shape, such as a rectangle, a circle, or certain curves depending need.

5. Clip Block:

They include clips to hold the bars of various diameters firmly in place so they can maintain their distance precisely.

6. Circular Block with a Lock Pin:

The benefit of this kind of spacer is that once the columns have been reinforced, you can fix and lock it externally.

 Even if the column rebars twist, it still provides the same cover distance.

Advantages of Concrete Cover Block:

  1. Brick masonry units are aligned and interlocked using concrete block spacers.
  2. This functional performance can be attained by creating a space for the mortar joint, alignment, and interlock of adjacent units.
  3. A spacer made of concrete blocks aids in weight transmission without damaging the joint.
  4. The daily heights of the wall can be increased by the worker with the use of concrete block spacers.
  5. It increases the efficiency of the building.

Disadvantages of Concrete Cover Block:

  1. Quality assurance is required.
  2. If suitable quality is not maintained, it may collapse under significant live loads and reinforcements.
  3. Brittle.
  4. It takes a long time to produce them.
  5. Price is expensive.

Uses of Concrete Cover Blocks:

  • The concrete block spacers are used to modification of this masonry installation method.
  •  As work progresses along the wall, masonry pieces can be installed on numerous courses that are within a mason’s reach.
  • After installing the units, the concrete block pacers enable workers to add mortar to the wall.
  • The usage of concrete block spacers aids the masonry industry in overcoming the difficulty of finding qualified labor.
  • Additionally, the work of recruiting would be greatly simplified.


Concrete blocks are frequently set out in a straight line up to a string line.

The use of concrete cover block allows for modification of this masonry installation method.

Section Under: Housemodify

Hello and welcome to House Modify! I am Rahul and I am passionate about everything related to design, decoration and renovation. I am a serial renovator, currently working as a civil engineer. Take a look around, leave a comment and don't forget to subscribe to my emails so you don't miss out!

Leave a Comment