At Roundtower Lime, we provide a carefully curated range of natural insulation materials that offer high performance while maintaining the breathability and integrity of both heritage and modern buildings. Our range is ideal for solid wall construction, retrofits, and eco-conscious new builds.
Every product we supply is sustainably sourced, chemically safe, and designed to work in harmony with vapour-open materials like lime mortars and plasters. Whether you're upgrading thermal performance, preventing condensation, or conserving a historic structure, our solutions deliver long-term durability with minimal environmental impact.
🔹 Our Natural Insulation Range Includes:
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Wood Fibre Insulation (STEICO Range)
Vapour-permeable and thermally efficient, STEICO wood fibre boards and batts are ideal for roofs, walls and floors. Excellent for use in breathable construction systems. -
Roundtower SuperTherm Insulating Lime Plaster
An ultra-lightweight, vapour-open lime plaster with exceptional insulation (λ = 0.0395 W/mK). Offers excellent moisture buffering and is ideal for internal solid wall upgrades. -
Calcium Silicate Boards (SkamoWall)
Rigid, breathable insulation boards for controlling condensation and mould in cold, damp masonry. Excellent for retrofit projects in basements and old stone buildings. -
Expanded Cork Boards
100% natural and recyclable insulation boards offering excellent acoustic and thermal properties. Ideal for internal insulation on stone or brick walls. -
Expanded Cork Granules
Lightweight loosefill cork for insulating floors, cavity walls, and screeds. Carbon-negative and easy to handle, with excellent thermal and acoustic performance. -
Hemp Shiv
The woody core of the hemp plant used with lime to form Hempcrete. Offers insulation, breathability and carbon sequestration in both new and historic buildings. -
Roundtower NHL-Based Insulating Plaster
Breathable insulating plaster based on NHL 2 and lightweight aggregates. Effective for internal or external use where thermal upgrades are needed. -
Glapor Recycled Foamed Glass Gravel
A critical component of the Roundtower Limecrete Flooring System, Glapor is a lightweight, non-capillary, insulating sub-base made from 100% recycled glass.
✅ Why Choose Natural Insulation?
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Promotes healthy indoor air through humidity buffering
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Reduces interstitial condensation and moisture risks
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Compatible with traditional lime mortars and breathable paints
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Non-toxic, VOC-free, and safe for occupants and installers
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Supports low-carbon and circular construction principles
Our full range is designed to meet both conservation needs and modern energy standards, helping you deliver high-performance, durable and environmentally responsible projects.
Frequently Asked Questions (FAQ)
1. Which insulation is best for internal solid wall upgrades?
Roundtower SuperTherm, Steico Wood Fibre , and Calcium Silicate Boards are all excellent breathable options. The choice depends on the wall condition, budget, and insulation target. SuperTherm is the highest performing in terms of thermal and moisture buffering.
2. Can I use your insulation products with modern heating systems like underfloor heating?
Yes. Glapor Foam Glass Gravel and Limecrete Slabs are fully compatible with underfloor heating. We also supply geogrids and membranes to secure UFH systems in place within breathable floor makeups.
3. Are your insulation products suitable for protected or heritage buildings?
Absolutely. All Roundtower insulation solutions are designed for use in historic and solid masonry buildings, ensuring no trapped moisture, full reversibility, and minimal disruption to existing fabric.
4. Do you offer technical support or U-value calculations?
Yes. We offer technical support, U-value modelling, and WUFI moisture analysis for project-specific guidance. Please contact our team for advice on build-ups and condensation risk.
