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Thermalite Blocks (3 Products)

Thermalite blocks are a type of aircrete block that boast a range of exceptional attributes, including sound and thermal insulation, ease of handling, impressive compressive strength, and fire and moisture resistance - all of which are derived from its innovative closed micro-cellular structure. These distinctive features render them ideal for use in building internal and external walls, foundations, and block and beam floors.

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Thermalite Blocks


Building construction has come a long way over the years, and today, energy efficiency is one of the most important considerations when it comes to designing and constructing a building. 


Thermalite blocks are a popular choice for construction professionals looking to achieve high levels of insulation and energy efficiency in their building projects.


This lightweight concrete block is made from a blend of pulverized fuel ash (PFA), sand, cement, lime, water, and a small amount of aluminium powder. 


The closed micro-cellular structure of Thermalite, with its small pockets of trapped air, imbues it with remarkable traits: excellent thermal and sound insulation, a lightweight design, impressive compressive strength, and resistance to fire/moisture.

Thermalite Blocks Applications 

The versatility of Thermalite aircrete blocks is unparalleled due to their range of strength, thermal conductivity, and density properties. 

These blocks come in various weights and dimensions, making them suitable for a wide range of applications. 


From building internal and external walls to using the special tongue and grooved trenchblocks for foundations, and constructing block and beam floors, there is a Thermalite aircrete block that can meet your needs.


Depending on the block you use, Thermalite can be utilised in: 

  • Separating walls 
  • External walls
  • Foundations
  • Partitions

Thermalite Blocks Key Features

One of the biggest advantages of using Thermalite blocks in building construction is the high level of insulation they provide - making U Value targets easier to hit. This aids in reducing heating and cooling costs, as well as making the building more comfortable for occupants. 

In addition, Thermalite blocks are also known for their sound insulation properties, which can help to reduce noise levels in the building.


Let's check the specs: 

  • Closed micro-cellular structure - comprises tiny pockets of trapped air
  • Excellent thermal and sound insulation
  • Lightweight composition ensures easy handling
  • High compressive strength
  • Moisture resistance
  • Fire resistance
  • Cost effective solution

Frequently Asked Thermalite Blocks Questions

What Are The Scratch Marks On Thermalite Blocks? 

Thermalite has implemented a revolutionary feature to help you quickly and accurately recognise each block's technical specifications: the scratch mark. 

This exclusive trait of Thermalite is especially advantageous when constructing your project as it helps you to distinguish the performance of the block at a glance. The performance can be determined by the number of scratches present on the block. 

We stock an extensive range of Thermalite blocks to accommodate all of your building needs.

What Is The Most Thermally Efficient Block in The Thermalite Range? 

Turbo block, the most thermal efficient member of Thermalite's product family, makes it an ideal solution for two-storey external walling needs that have low U-value requirements.

What Does Aircrete Mean? 

Aircrete blocks often referred to as aerated blocks, are one of the lightest forms of concrete that offer many benefits including exceptional structural, thermal, sound, fire, and freeze/thaw properties. 


Aerated concrete blocks have been used in the UK since the 1950s and are made of pulverised fuel ash (PFA), sand, cement, aluminium powder, lime, and water. 

What Are Mortar Perpends/Perps? 

The term "perpends" comes from old English and refers to the head or vertical mortar joints in bricks. Unlike horizontal bed joints, which are easier to fill, head joints require proper butting to prevent gaps in the wall system.

What Makes AAC Block wall Masonry More Cost-effective Than Brick Wall Masonry?

The standard AAC block is 9 times larger than traditional brick, resulting in fewer joints and reducing the amount of cement needed. 


AAC blocks are factory-made, providing a smoother finish and more precise specifications. Additionally, the larger size and lighter weight of AAC blocks make transportation and construction faster, while also reducing labour costs.

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