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What is lightweight expanded clay aggregate used for in electrical installations?

Lightweight expanded clay aggregate is a lightweight, porous material commonly used in practical installations as an insulating base under distribution boards or enclosures mounted on the floor. Instead of concrete or sand—which can be heavy and difficult to work with—lightweight expanded clay aggregate enables quick and clean leveling of the substrate, especially when mounting cabinets in locations where a monolithic foundation is not feasible. Its structure prevents vibration transfer and minimizes the risk of internal damage to the distribution board caused by moisture or uneven settlement of the substrate.

Why choose a 20L bag?

A 20-liter bag provides the optimal quantity for a single installation—sufficient to avoid purchasing additional packages, yet not so large that the material risks degradation or takes up unnecessary space on site. At 5.4 kg, the bag is easy to carry and manually spread—even in confined spaces or at height. No specialized equipment is required, and its porosity allows natural moisture drainage from the substrate, which is critical for installations in basements or ground-floor areas with poor ventilation.

How does it work in practice?

After laying a layer of lightweight expanded clay aggregate (typically 5–10 cm) beneath the distribution board, the cabinet can be securely and permanently mounted. This material does not decompose, rot, or attract mold. Unlike sand, it does not settle under load or generate dust. In existing buildings—where pouring a concrete slab is impossible—lightweight expanded clay aggregate is one of the few solutions that provide stability without requiring floor renovation. It is widely used by both residential and commercial installers, particularly where cleanliness and speed of installation are essential.