The Roundtower Limecrete Flooring System is a carefully engineered, fully breathable alternative to concrete floors — specifically developed for use in solid wall buildings, heritage properties, and sustainable new builds. Designed to address the moisture risks often associated with damp-proof membranes (DPMs), this system allows water vapour to move freely, protecting both the building fabric and indoor air quality.
What Makes Limecrete Different?
Unlike conventional concrete floors that trap moisture, the Roundtower Limecrete System combines a non-capillary insulating base (Glapor foam glass gravel) with a vapour-permeable NHL limecrete slab, offering a long-lasting, eco-conscious solution that supports the health of the building.
System Components:
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Glapor Recycled Foam Glass Gravel
A structural, insulating, and capillary-breaking base layer made from 100% recycled glass. This high-performance material eliminates the need for a DPM while offering excellent compressive strength and thermal insulation (λ = 0.080 W/m·K). -
Geotextile Membrane
A robust, breathable separation layer to prevent lime migration into the foam glass. -
E'Grid Geogrid Reinforcement (Optional)
Used when integrating underfloor heating, this grid holds clip rails and UFH pipes securely in place prior to screeding. -
Limecrete Slab
A site-mixed or pre-formulated slab made with NHL 5, blended aggregates, and fibres for strength and flexibility. The slab acts as a thermal mass, distributing loads while allowing the floor to breathe. -
Optional Underfloor Heating System
Fully compatible with UFH, allowing radiant warmth to be delivered efficiently through the breathable slab.
Why Choose the Roundtower Limecrete System?
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Vapour Permeable – prevents condensation and rising damp
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No Damp Proof Membrane Required
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Thermal Insulation & Structural Integrity in One Layer
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Sustainable Materials: 100% recycled and low-embodied carbon
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Ideal for Heritage, Conservation & Retrofit Projects
FAQs – Roundtower Limecrete Flooring System
Is limecrete suitable for listed or protected buildings?
Yes. Its breathability and reversible nature make it ideal for heritage and conservation work.
How thick is the system overall?
Typically, a minimum depth of 150mm of Glapor and 100mm of limecrete is recommended. However, insulation thickness can be adjusted based on U-value requirements.
Can I install underfloor heating with limecrete?
Absolutely. The system is fully compatible with UFH, using a geogrid and clip rail system to hold pipes in place during pouring.
Do I need a DPM or vapour barrier?
No. The Glapor aggregate acts as a capillary break and moisture control layer, eliminating the need for synthetic membranes.
