Question 1

1. What are the typical dimensions of a 100mm concrete block?

Accepted Answer

Standard dimensions are usually 440mm x 215mm x 100mm, blocks are also available in a range of other sizes to suit a variety of jobs.

Question 2

2. How much does a 100mm concrete block weigh?

Accepted Answer

Weight varies depending on the block type and density. A standard 100mm dense concrete block with dimensions of 440mm x 215mm x 100mm typically weighs about 18–20kg when dry.

Lightweight or hollow blocks are designed to reduce unit weight and improve handling. Depending on the material and manufacturing method, these blocks may weigh around 9–13kg.

Actual weight varies between manufacturers, as density, aggregate type, and block design differ. If weight is important, make sure to check the manufacturer’s technical data to confirm the exact weight for the product being used.

Question 3

3. What’s the difference between dense, lightweight, and hollow 100mm blocks?

Accepted Answer

Dense blocks offer higher loadbearing capacity. Lightweight blocks reduce manual handling effort. Hollow blocks cut unit weight further and can give better thermal performance.

Question 4

4. How many 100mm concrete blocks do I need per square metre?

Accepted Answer

This measurement is the same regardless of how thick the block is. Standard block size of 440mm x 215mm means approximately 10 blocks per square metre with standard mortar joints. You may wish to allow extra blocks for cuts and wastage on site.

100mm concrete blocks

Solid Dense Concrete Block 7.3N 100mm

Thermalite Solid Hi-Strength Block 7.3N 100mm

H+H Celcon Solid Concrete Block 3.6N 100mm

Plasmor Fibolite Solid Lightweight Concrete Block 3.6N 100mm

Tarmac Toplite Solid Concrete Block 3.6N 100mm

Plasmor Stranlite Concrete Block 7.3N 100mm

H+H Celcon Solid Hi-Strength Block 7.3N 100mm

CCP Modulite Solid Medium Dense Concrete Block 7.3N 100mm

Thermalite Solid Shield Block 3.6N 100mm

Forterra Fenlite Solid Lightweight Concrete Block 7.3N 100mm

Thermalite 100mm Coursing Brick

Plasmor Aglite Solid Block 4.2N 100mm

Thermalite 100mm Turbo 2.9N Block

Plasmor Fibolite Solid Lightweight Concrete Block 7.3N 100mm

Tarmac Hemelite Solid Concrete Block 3.6N 100mm

Thomas Armstrong Solid Ultralite Concrete Block 3.6N 100mm

Besblock 100mm Insulite Medium Density Solid 7.3N

FORTERRA Evalast Solid Dense Block 7.3N 440 x 215 x 100mm

Newlay Newcon Solid Dense Block 7.3N 440 x 215 x 100mm