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4-10mm Leca® LWAExpanded clay aggregate utilised as a decorative and moisture retentive substrateTypical application for Leca® in lightweight Green roof constructionGenuine LECA® LWALECA® LWA in stock, at our depot in Rugeley4-10mm Leca® LWA Packed for chimney back fill4-10mm Leca LWA being used for chimney backfillChimney lining being installed prior to backfill with 4-10mm Leca LWAFixing of Chimney lining prior to backfilling with 4-10mm Leca® LWA
Leca® LWA 4-10mm Lightweight Expanded Aggregate
Product Code: 7890

 12 Pack Pallet:   £218.16 Inc VAT and delivery* 
 20 Pack Pallet - One m3:   £268.32 Inc VAT and delivery* 
 30 Pack Pallet:   £333.72 Inc VAT and delivery* 



LECA®LWA - Lightweight expanded clay aggregate graded from 4mm to 10mm. Suitable for chimney lining backfill, green roofs, hydroponics and non structural lightweight concrete. Delivered in robust 50ltr packs on a pallet for all construction projects.

Pack Volume: 50 ltrs (Approximately three times the volume of a pack of "normal" aggregates) Weight per pack approximately 15kg

Pack size: Approximately 800mm x 400mm x 150mm.

Granule Size: Approx. 4-10mm.

Density: LECA® LWA is a super-lightweight aggregate with a dry bulk density of approximately 350 kg/m3.

Water Saturated Density:
When saturated for at least 24 hours, 4-10mm LECA® LWA is likely to absorb approximately 30% by weight of water with a resultant bulk density in the order of 500kg/m3

Genuine and original premium brand LECA® LWA distributed prepacked throughout the UK by Specialist Aggregates.

Delivered in robust 50ltr packs on a pallet for all construction projects.

Expanded clay granules are made by firing selected clay in a rotary kiln at a very high temperature. As it is fired, the organic compounds in the clay vaporise forcing the pellets to expand and become honeycombed while the outside surface of each granule fuses to give a ceramic shell. The resulting granules are lightweight, porous, and have a good resistance to crushing.

Being a natural product expanded clay aggregate contains no harmful substances, it is inert with neutral pH, The granules are resistant to frost and chemicals, and will not break down in water. They are also non-combustible and have excellent sound and thermal insulation properties.

Application & Use:
Top quality clean general purpose expanded lightweight clay with a minimum of fines backed by the Worldwide LECA®LWA brand. The product is a dark grey/brown colour and offered for use in situations where aesthetics are not a prime consideration, in particular:

Inert Backfill: Especially for restricted areas, for instance backfill to chimney linings where the product's small size and spherical shape together with convenient and strong packaging allow for ease of placement.

Installers tell us that Leca® LWA has advantages over vermiculite based products in so far as the material will not clump in damp conditions, or blow away during installation.

Whilst every chimney will be different our personal experience on backfilling a lined chimney on a typical 1930's town house required one 50ltr pack per metre of chimney.

Horticulture: As a substrate in hydroponics, and generally blended with growing media to improve drainage and provide insulation.
An effective application has also been identified for growing marginal pond plants.

Green Roofs: The web contains advice on many and often contradictory methods for producing green roofs. Nevertheless 4-10mm Leca® LWR provides the definitive base for lightweight soils. For bottom and peripheral drainage we would recommend the 10-20mm grade Leca® LWA.

Non-Structural lightweight concrete: Suitable for fake rocks, theatre props and lightweight repairs.

Particle Size:
Sieve Size mm % Passing
14 100%
10 99%
8 81%
4.0 9%
0.25 1%
Chemical Composition:
Principal components typically:
Chloride 0.04%
Acid Soluable sulphate 0.5%

Moisture Content:
This product is generally supplied dry, however, please inform our office if this is a specific requirement for your application

* Specialist Aggregates' Price Promise:
All prices shown include UK VAT and delivery to 90% of UK locations - Read More. - There are no hidden charges on checkout.

We export throughout Europe and Worldwide - please enquire for shipping rates.

Quick Contact:
WhatsApp your enquiry and images to 07484 022898

Logistics: ( See also Information / Delivery)
This product option is supplied packed in safe and easy to handle weatherproof packs stacked on a wooden pallet. Packs are stretch wrapped onto the pallet for added protection and security. For quantities of less than 12 packs see our discounted single pack courier delivery option.

Pallets are delivered by national couriers and off-loaded onto a level hard-standing using vehicle tail-lift and pallet truck. Our couriers do not offer a crane (Hiab) off-load facility.

Pallet deliveries by national couriers are not advised for locations with narrow or difficult access. Please advise during checkout or contact our office for advice if you have specific delivery requirements or concerns.

Failed deliveries due to problems with access which as not been pre-notified will be returned to our warehouse and charged for both outward and return delivery,

The immediate product wrapping, pallet stretch wrap and wooden pallet can all be recycled.

Specify: 4-10mm LECA® (50ltr Packs) Supplied by Specialist Aggregates.

Product Code: 7890

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