Question 1

1. What are Hemelite blocks?

Accepted Answer

Hemelite blocks are a range of lightweight aggregate concrete blocks made by Tarmac. They’re made out of Hemelite, a material that’s made using expanded clay aggregates within a cement-based mix. Hemelite blocks are used for masonry constructions including cavity walls, partitions, and beam and block floors.

Question 2

2. Are all lightweight aggregate blocks made of Hemelite?

Accepted Answer

No. Although some builders may use ‘Hemelite’ as a generic term for lightweight aggregate blocks, technically it only refers to Tarmac’s specific product range.

Question 3

3. Are Hemelite blocks loadbearing?

Accepted Answer

Yes, Hemelite blocks can be used in loadbearing masonry when the correct strength grade is selected. Strength classes such as 3.6N, 7.3N, and 10.4N allow them to be used in different structural applications. The specification will normally define which grade is needed based on the structural load and wall design.

Question 4

4. Can Hemelite blocks be used below ground?

Accepted Answer

Hemelite blocks can be used in walls above or below ground when correctly specified. However, higher strength grades may be used in areas exposed to moisture or higher structural loads. Always follow the structural drawings and manufacturer guidance for the project.

Question 5

5. What finish can be applied to Hemelite blocks?

Accepted Answer

Hemelite blocks provide a suitable background for common wall finishes. These may include plaster, render, drylining, or other internal lining systems. The selected finish depends on the wall design and the performance needs for the project.

Hemelite blocks

Lightweight Solid 7.3N Block 440 X 215 X 140 mm

Tarmac Hemelite Solid Concrete Block 3.6N 100mm

140x440x215mm Tarmac Hemelite Standard Solid Block (10.4N)

Tarmac Concrete Block Hemelite Standard Solid Block 7.3N 440 x 140 x 215mm