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Preserving the character and performance of heritage buildings demands materials that respect the original construction while delivering modern thermal efficiency and moisture control.
Leca® Insufill Underfloor Insulation (50L Bags) is a lightweight expanded clay aggregate designed for underfloor insulation, offering a breathable and robust solution that complements traditional building fabric.
Key benefits for heritage projects:
🔹 Breathable by design
Unlike impervious foams or rigid boards, the open-structure expanded clay aggregate facilitates moisture movement and vapour exchange under floors — helping to mitigate rising damp and interstitial condensation when paired with correct detailing.
🔹 Integrated damp protection
Leca® Insufill protects damp-proof membranes and ductwork during installation, and when used in conjunction with appropriate vapour control detailing offers a durable thermal layer that supports breathable ground floor design.
🔹 Easy installation, reduced disruption
Supplied in 15 kg, 50 L bags, the product can be manually laid in a one-man process, speeding up installation in confined or sensitive sites without heavy plant — ideal for retrofit and refurbishment scenarios.
Leca
Together We Build For The FutureLECA® LWA is used extensively as a lightweight fill for civil engineering and structural applications. Through promotion and specification, our client base is continually finding further solutions and interesting uses for this special product.
