At Roundtower Lime, we offer a leading range of breathable and environmentally responsible floor insulation systems, with a particular focus on Glapor Recycled Foam Glass Gravel – the foundation of our high-performance Limecrete Flooring System.
Our flooring insulation is specially designed for use in traditional solid-wall buildings, heritage projects, and eco-conscious new builds where vapour permeability, moisture control, and sustainability are paramount. These systems avoid modern damp-proof membranes, instead using capillary-breaking insulation layers that allow moisture to evaporate naturally.
Glapor Foam Glass Gravel – Key Features
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Thermal conductivity: 0.080 W/m·K
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High compressive strength: Ideal as load-bearing hardcore
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Capillary break: Closed-cell structure blocks rising damp without the need for DPMs
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Breathable: Allows vapour to pass while halting liquid moisture
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Recycled & Sustainable: Made from 100% recycled glass in a carbon-neutral process
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Durable & Resistant: Inert, rot-proof, rodent- and insect-resistant
Used as the sub-base insulation layer in our Roundtower Limecrete Flooring System, Glapor replaces the need for hardcore, insulation boards, and plastic sheeting—making it ideal for conservation projects where conventional methods risk trapping moisture.
Frequently Asked Questions (FAQs)
Q1: What is Glapor foam glass gravel used for?
Glapor is used as the insulating, capillary-breaking sub-base layer beneath a limecrete slab in breathable floor systems. It replaces standard hardcore and insulation in traditional and moisture-sensitive buildings.
Q2: Can Glapor be used in listed or protected buildings?
Yes. Glapor is fully compatible with heritage floors. Unlike membranes or rigid insulation, it does not trap moisture, making it ideal for conservation work.
Q3: Does Glapor require a damp-proof membrane?
No. Its closed-cell structure breaks capillary action, preventing rising damp while remaining vapour open. It replaces the need for plastic DPMs.
Q4: Is Glapor suitable for use with underfloor heating?
Yes. Glapor can be combined with Geotextile membranes and geogrid layers to secure underfloor heating systems before limecrete or lime screed is poured.
Q5: Is Glapor environmentally friendly?
Absolutely. It is made from 100% recycled post-consumer glass, produced in a carbon-neutral process, and fully recyclable at the end of its life.
