STEICO Special Dry is a high-performance, breathable wood fibre insulation board designed for external wall insulation, sarking on pitched roofs, and external sheathing for timber frame walls. Uniquely, this board can be directly rendered onto or clad, making it a versatile solution for both modern low-energy builds and the upgrading of traditional walls.
Manufactured from sustainably sourced wood fibres, STEICO Special Dry combines excellent thermal insulation, moisture management, and windtightness while maintaining a vapour-open structure. This ensures a healthy, durable building envelope with natural summer overheating protection.
Key Benefits
-
Superior Thermal Performance – Low λ-value (0.040–0.041 W/mK) reduces heat loss and improves energy efficiency.
-
Render- or Cladding-Ready – Can be finished with breathable lime renders or cladding systems.
-
Highly Breathable & Vapour Open – μ-value ≤ 3 allows moisture to move freely, preventing condensation.
-
Weather-Resistant & Windtight – Resists rain and wind during construction.
-
Excellent Acoustic Insulation – Damps airborne sound for improved comfort.
-
Eco-Friendly – Made from natural, renewable wood fibres, recyclable, and free from harmful additives.
-
Summer Heat Protection – High thermal mass reduces overheating risks.
Applications
-
External Wall Insulation (EWI) – Can be rendered or clad, ideal for energy upgrades and conservation projects.
-
Sarking Board for Roofs – Provides insulation and wind protection over rafters.
-
Timber Frame Sheathing – Enhances thermal efficiency, airtightness, and breathability.
-
Passive House & Low-Energy Construction – Supports high-performance design standards.
Technical Features
-
Thermal Conductivity (λ-value): 0.040–0.041 W/mK
-
Density: ≥180 kg/m³ – strong, stable, and durable.
-
Vapour Resistance (μ-value): ≤3 – highly breathable.
-
Water-Resistant Surface – withstands temporary exposure during installation.
-
Available in multiple thicknesses for flexible design solutions.
Why Choose STEICO Special Dry?
Because it’s more than insulation. STEICO Special Dry delivers thermal performance, moisture control, acoustic comfort, and durability while remaining fully natural and sustainable. Whether you’re upgrading a heritage building or designing a Passive House, this board creates a long-lasting, breathable envelope that can be finished with render or cladding to suit your project.
