STEICOinternal is a high-performance timber-based wood‑fibre insulation board designed specifically for internal wall insulation in both masonry and traditional timber-frame buildings. It supports healthy moisture management, excellent thermal performance, and compatibility with lime and plasters.
Key Benefits & Product Highlights
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Natural wood-fibre construction: Produced via STEICO’s wet process, ensuring minimal binder usage and environmentally responsible sourcing (PEFC-certified).
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High moisture buffering and diffusion openness: With a vapour diffusion resistance factor μ ≈ 5 it actively regulates indoor humidity and prevents condensation.
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Thermal conductivity λₙ = 0.038 W/m·K: delivers good insulation in slim installations, improving thermal performance by over 50% in retrofit contexts with just a few centimetres of insulation.
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Density around 160 kg/m³, with compressive strength CIS(10 %) 50, and tensile strength perpendicular ≥ 2.5 kPa, suitable for supporting lime or clay plaster.
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Independently recommended by the German Institute for Building Biology (Rosenheim) for healthy indoor air regulation.
Areas of Application
STEICOinternal is ideal for:
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Internal insulation of solid masonry or stone walls in historic and traditional buildings
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Timber-frame renovation projects using clay or lime plaster finishes
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Retrofitting projects aiming to improve energy efficiency without sacrificing breathability
Its diffusion-open structure makes it a reliable companion for lime- and clay-based plaster systems.
Why Choose STEICOinternal?
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Eco-friendly & sustainable: Made from responsibly sourced natural softwood, no synthetic chemicals.
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Exceptional indoor climate control: Sorptive and vapour-open, it moderates humidity and enhances comfort.
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Thin but efficient: Delivers strong insulation gains even in slim format—ideal where space is limited.
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Compatibility with traditional finishes: Primed to carry lime plaster without need for additional supporting structure.
Installation Tips
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Fix using mechanical fixings into solid masonry.
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Finish with breathable lime or clay plaster systems
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Ideal thickness range: 40–100 mm depending on U‑value target
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Used in conjunction with Roundtower Board Render which acts as an adhesive and base coat onto Steico Internal.
