FAQ

Red ash is a byproduct of the pottery making process that was used as a cheaper alternative hardcore in the building process between the 1940’s and 1970’s. In the case of flooring, it became common to use fill materials below a concrete floor.

The issue with red ash in flooring is it’s sulphate content which causes what is known as a sulphate attack. Sulphate attack occurs when the red ash comes into contact with moisture causing the sulphate to expand and penetrate the floor. This can result in the floor bulging and even cracking which can start to cause serious structural damage to the house.

Due to the shortage of traditional building materials following world war two, alternative, cheaper solutions were used. Red ash, black ash Slag and Grey Fly Ash were all seen as suitable alternatives and were readily available as byproducts of other manufacturing processes. In Staffordshire, the local Potteries industry meant that high levels of red ash was available and was widely used. Issues relating to red ash use in construction were only identified in the 1970’s.

The most recognisable sign of a red ash issue is a fine white residue in cracks of the floor, combined with bulging and cracking of the floor. If you are unsure, the expert Telstrong team are able to professionally identify the presence of red ash and suggest a solution.

Removal of red ash is a comprehensive job. It will involve complete removal of the affected area of floor down to a depth of between 1-4 feet to ensure that all red ash is cleared. It is not recommended to undertake this project without a specialist as your new floor will need to be certified by an appropriate inspector to meet building regulations.