Thermal performance

Superior Energy Performance and Thermal Efficiency

SIPCO offers a range of panel thicknesses that achieve exceptionally low U-values, from 0.35W/m²K down to an impressive 0.09W/m²K. The U-value measures the rate of heat transfer through a material, with lower values indicating better insulation performance. SIPCO panels meet and exceed Building Regulations, BREEAM, and Passivhaus standards, ensuring optimal energy efficiency and minimal heat loss through thermal bridging.

Understanding Thermal Bridging and the Y-Value

Thermal bridging occurs when areas with reduced insulation or structural elements, such as studs, plates, and joists, allow more heat to flow through than the surrounding areas. This is because timber has a lower thermal resistance than the insulation between framing members. Thermal bridges can appear at junctions where building elements meet or where the structure changes, increasing the overall thermal conductivity.

The Y-value quantifies the total heat loss due to thermal bridging in a building. SIPCO’s system achieves a typical Y-value of 0.025 W/m²K, significantly outperforming the standard values of 0.08 and 0.04 W/m²K set by accredited and enhanced construction details. This superior performance is particularly beneficial in reducing heat loss and improving overall building efficiency.

Timber Content and Energy Efficiency

SIPs generally contain solid timber around window and door openings, as well as at panel junctions. The amount of solid timber varies depending on the building type and size, with SIPCO’s timber content as low as 4%, compared to an average of 15% for traditional timber-framed buildings. This reduced timber content further enhances the overall energy performance, minimising heat loss.

Airtightness and Ventilation

SIPCO’s structural insulated panels and custom jointing systems create airtight structures that not only meet but often exceed the requirements set out by Building Regulations. Due to the effectiveness of our system, we recommend incorporating positive ventilation strategies. When linked with heat recovery systems, these can significantly reduce energy costs. SIPCO panels have air leakage levels as low as 0.6 m³/m²hr@50 Pascals as standard, and with additional tape, they can easily meet the stringent Passivhaus standards.

U-Value Calculations and Flat Roof Considerations

While Building Regulations and British Standards may impose limits on the size and span of flat roofs for ventilation purposes, SIPCO offers U-value calculations tailored to your system and specifications. The SIPCO U-value table details the performance of various panel thicknesses, helping you achieve the optimal balance of energy efficiency and structural integrity.

Note: Building Regulations and British Standards may pose limits on the size/spans of flat roofs for ventilation requirements. SIPCO can conduct U-value calculations based on our system and client specifications.

The SIPCO U-value table provides different performances for varying thicknesses of panel – see below: