What are Base layer materials?

Base layers can either be formed from one sort of material or they can be a combination of different ones in order to best suit the particular needs of a construction project. Generally speaking, base layer materials can be divided into three different types: natural aggregates, secondary aggregates and recycled aggregates.

Natural aggregates

Natural aggregates can be graded in different ways. Type 1 and Type 2 aggregate consist of crushed rock which should not exceed 63mm and 32mm in size respectively. Type 1 is commonly used within a path’s base layer whereas Type 2 is normally used in the lower part only as it is not as strong as Type 1. In contrast, Type 3 is finer still and used as a draining base layer. Other natural aggregates include crusher run and scalpings. Both of these materials are waste from quarries and vary in strength.

Secondary aggregates and recycled aggregates

Recycled and secondary aggregates (RSA) are becoming increasingly common. They consist of by-products from other industries which are considered to be reusable in aggregate form. Examples of the origins of RSA include demolition waste which can include hardcore, brick and concrete from destroyed buildings on the site. Road planings are also a source of RSA (occurring when a road is re-constructed or when maintenance work is carried out). The quality of the RSA will determine what it is used for, but it is not uncommon for it to be used as a lower base layer, with Type 1 natural aggregate utilised on the upper part.

Mone Brothers have been operating for more than 50 years and during this time have established themselves as one of the biggest suppliers of building materials and plant equipment in the UK. For more information about the services we provide or to discuss a project in further detail please get in contact with us on 0113 2523636.

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