Big Panels are the Business!

SIPit specialises in the design and manufacturing of large Structural Insulated Panels (SIPs) that are specifically engineered to achieve exceptionally low U-values. This innovative approach not only accelerates the construction process but also ensures that your building project remains cost-effective while significantly reducing its carbon footprint. By utilising these advanced panels, you can meet and even exceed the rigorous standards set for passive house construction, which emphasizes energy efficiency and sustainability.

Recently, we dispatched a significant order of our 245 SIP panels to the picturesque Isle of Lewis. This shipment is destined for a remarkable Grand Design project that focuses on a self-build passive house. These panels are meticulously designed with a simple wall build-up that maximises insulation and energy efficiency. The construction begins with a 12.5mm layer of plasterboard, which serves as the internal finish. Behind this, there is a 25mm service void that allows for the integration of electrical and plumbing services without compromising the insulation integrity.

To further enhance the performance of the panels, a vapor barrier is applied to the internal face of the SIP. The core of the panel consists of a 245mm thick polyurethane (PU) SIPit panel, known for its superior thermal resistance and strength. On the exterior side, a layer of breather paper is installed, which allows moisture to escape while preventing water ingress, thus protecting the integrity of the insulation.

To promote airflow and further enhance insulation performance, there is a 50mm ventilation gap between the breather paper and the external cladding. This gap is essential for maintaining a healthy building envelope, allowing any trapped moisture to dissipate while also contributing to the overall thermal efficiency of the structure. The external cladding, which can be customised to the homeowner's aesthetic preferences, completes the assembly, providing both protection and visual appeal.

This carefully engineered wall build-up achieves an impressive U-value of just 0.09 W/m²K, which is indicative of exceptional thermal performance. With an overall wall thickness of 350mm, this design not only meets the stringent requirements for passive house certification but also allows for the use of standard timber sizes, specifically 220x45mm. This compatibility with conventional building materials simplifies the construction process and reduces costs, making SIPit panels an ideal choice for sustainable building projects.