The difference between a Class A engineering brick and a Class B engineering brick is essentially to do with the compressive strength and the water absorption. A Class A engineering brick has a compressive strength greater than 125N/mm2 and water absorption less than 4.5%, whereas a class B engineering brick has a compressive strength greater than 75N/mm2 and water absorption of less than 7%.
Class B engineering bricks are typically used for their physical attributes and properties rather than for how they look, and they are used in construction projects where strength and resistance to water, frost, and other weathering is extremely important. You will find that Class B blue engineering bricks are commonly used for:
- Retaining walls
- Damp proof courses
- General groundworks
- Civil engineering
What are the benefits of using Class B blue engineering bricks?
Class B engineering blocks 73mm x 102mm x 215mm (H x W x L) are generally used where aesthetics are not important, but they have many important benefits including:
- Smooth texture
- Low water absorption
- Extremely strong and are best used in projects that require higher strength compression
- Extremely durable and made from materials that will stand the test of time for the longevity of your building. They will not rot, corrode, or burn and they do not require painting to finish the project.
As one of the leading class B perforated bricks suppliers, we offer a wide range of engineering bricks at cost effective prices to suit your construction project. We also have a wide range of engineering facing bricks
and decorative bricks for your other projects – we can help you complete your job from start to finish.
Natural variation information
All our solid class B engineering bricks are made from naturally occurring materials. Therefore, the colour and texture will differ slightly for each brick fur to the various locations in which they have been sourced from.
What is a class B engineering brick?
A class B engineering brick is a smooth, perforated, wirecut brick that is used where strength and durability are essential. They are known for their physical properties rather than how they look, and it has a compressive strength greater than 75N/mm2 and water absorption of less than 7%.
What size is a class B engineering brick?
Class B engineering bricks are generally 215 x 102.5 x 65mm (L x W x H) and are characterised as a very dense brick with a high crushing strength. They offer damp resistance and frost resistance thanks to their low water porosity and are specifically made to improve the structural performance of a building.
Can you build a wall with an engineering brick?
Traditionally, engineering bricks are used in construction where strength and resistance to water / frost are important. They are used in applications such as retaining walls, damp proof courses, manholes, sewers, and general groundworks.
Are engineering bricks waterproof?
Yes, engineering bricks are waterproof thanks to their low water porosity. This means that they are resistant to water and to frost, and subsequently commonly used for damp proof courses and for bridges, canals, and tunnels.
Why are engineering bricks blue?
Blue engineering bricks are normal clay bricks that have been turned blue as a result of being heated at extremely high temperatures in a low oxygen environment. This means that they are not only strong and durable, but their surface is impervious and water resistant.
Are engineering bricks frost resistant?
Yes, engineering bricks are both resistant to frost and waterproof thanks to their low water porosity. This means that they are resistant to water and to frost, and subsequently commonly used for damp proof courses and for bridges, canals, and tunnels.
How heavy is a class B engineering brick?
A standard engineering brick that measures 215 x 102.5 x 65mm (L x W x H) will weigh approximately 3.01 kg
Are engineering bricks stronger than concrete?
Thanks to their manufacturing process and being fired at extremely high temperatures in a low oxygen environment, engineering bricks generally have equal or a greater crushing strength than that to concrete common bricks.
Why do engineering bricks have holes?
Engineering bricks are manufactured to make the most of their strength and not for their aesthetic value, and the holes in the bricks serve the main purpose of allowing the bricks to be locked together firmly by allowing mortar to seep through.
What are the types of brick?
There are three main types of brick – facing, engineering and common bricks. Facing bricks are the bricks that are used to create both exterior and interior walls during construction, engineering bricks are the strongest and are used for the building foundations, and common bricks are a basic clay brick with no colour control or special surface treatment.
What is the difference between an engineering brick and facing bricks?
The main difference is that engineering bricks have a higher compressive strength, whereas facing bricks focus more on the aesthetic and how they make the building look. Engineering bricks do not have any requirement for a certain colour or texture, and they are traditionally used in civil engineering work.
How can you tell the quality of bricks?
Bricks will undergo a series of tests to ensure that they are suitable for the job in hand before they can be sold, but there are some things that you can look out for to see if you are choosing quality bricks including uniformity of colour (they should all be roughly the same colour), how sharp the right angle corners are, and if they are uniform in texture.
How long will a class B engineering brick last?
Bricks that are made from clay are durable, sustainable, and reusable. You can expect a single brick to last between 150 – 500 years. You need minimal maintenance to keep this average life span, and with regular care and attention such as mortar replacing your bricks will stand the test of time.
How much does a class B engineering brick cost?
Engineering bricks can cost you as little as 70p per brick, and you can buy packs of bricks in a variety of different sizes to suit all construction needs and requirement.