STEICO Universal
STEICO Universal is a rigid wood fibre insulation board designed for use as a sarking board in pitched roof constructions and as an external sheathing board in timber frame wall systems. Manufactured from natural wood fibres, it combines thermal insulation, wind protection, and temporary weather protection within a single vapour-open board.
Its tongue-and-groove profile helps create a windtight outer layer while maintaining vapour permeability, making it suitable for breathable roof and wall constructions in both new-build and renovation projects.
Technical Data
| Property | Value |
|---|---|
| Product Type | Wood Fibre Sarking & Sheathing Board |
| Material | Wood Fibre |
| Thermal Conductivity (λD) | 0.048 W/mK |
| Density | Approx. 270 kg/m³ |
| Vapour Diffusion Resistance (μ) | 5 |
| Specific Heat Capacity | 2100 J/kgK |
| Fire Classification | Euroclass E |
| Compressive Strength | ≥ 200 kPa |
| Tensile Strength Perpendicular to Face | ≥ 30 kPa |
| Thicknesses Available | 22mm, 35mm, 60mm |
| Standard | EN 13171 / EN 14964 |
Key Benefits
Thermal Insulation & Weather Protection
Provides an additional layer of insulation while protecting the building envelope from wind and short-term weather exposure during construction.
Vapour Open Construction
The low vapour resistance allows moisture vapour to pass through the construction, supporting breathable wall and roof assemblies.
Windtight Outer Layer
The tongue-and-groove profile helps reduce unwanted air movement through the building envelope.
Suitable for Roof & Wall Applications
Designed for use as:
- A sarking board above rafters
- An external sheathing board for timber frame construction
Summer Heat Protection
The high density of wood fibre insulation helps slow heat transfer through the building fabric, contributing to improved comfort during warmer periods.
Sustainable & Renewable
Manufactured from wood sourced from responsibly managed forests and produced using renewable raw materials.
Typical Applications
| Application | Suitability |
| Sarking Board for Pitched Roofs | ✓ |
| Above-Rafter Insulation Systems | ✓ |
| Timber Frame Wall Sheathing | ✓ |
| Breathable Roof Constructions | ✓ |
| Breathable Wall Constructions | ✓ |
| New Build Projects | ✓ |
| Renovation Projects | ✓ |
Why Use STEICO Universal?
STEICO Universal combines insulation, windtightness, and weather protection within a single board. Installed externally, it helps improve the overall thermal performance of the building envelope while maintaining vapour permeability.
Its robust, high-density construction makes it particularly suitable for pitched roof and timber frame applications where a durable, breathable outer layer is required.
Installation Overview
1. Preparation
Ensure the supporting structure is level, dry, and suitable for installation.
2. Board Installation
Install boards with tight tongue-and-groove joints in accordance with STEICO installation guidance.
3. Weather Protection
Boards provide temporary weather protection during construction when installed correctly.
4. Detailing
Seal junctions and penetrations using compatible tapes and membranes where required.
5. Final Finish
Complete the roof or wall build-up with the specified external finish, roof covering, or façade system.
