Choosing External Wall Insulation Systems

Choosing the external wall insulation systems EWI is vital, as there are many options available to achieve differing levels of thermal performance and aesthetic finishes. Our external wall insulation specialists are always on hand to help you choose the best solution for your property, whether it’s a system that incorporates Rock mineral wool insulation, which is made of natural fibres of volcanic rock and other sustainable materials or one that uses wood cellulose fibre, which is non-combustible and has excellent fire safety and acoustic properties.

Traditional EWI is based on insulating boards, such as fibre cement and polystyrene panels, being covered by an outer render layer. This method is typically used for properties with solid walls. However, it does have a number of disadvantages, which can make it less than ideal for homeowners looking to improve their homes.

Maximizing Energy Efficiency: The Power of External Insulation Cladding Systems

The main issue is that foam panels aren’t breathable and can trap moisture behind walls. This can then lead to damp issues. The solution is to add a moisture barrier to the outside of the render, which can be time-consuming and expensive.

Another issue is that the insulation boards are typically quite thick, which can interfere with window, door and roof eaves and rainwater downpipes, meaning adjustments would be required. Also, some of these types of materials use energy-intensive processes and are made from raw materials like basalt rock and slag.

This is why StoTherm has developed a range of systems that don’t rely on insulation panels and instead have an insulated coating applied to the exterior of the building. The StoTherm range includes the innovative SprayCork external wall insulation, which uses a natural cork based material and is 7-8 times more insulating than conventional renders.