Internal wall insulation (IWI)

We specialise in internal wall insulation (IWI) solutions across the full spectrum, from mechanically strapped wall systems to Historic Scotland–compliant breathable builds, providing tailored solutions for both traditional and historic structures. Every project begins with a careful assessment of the building fabric, moisture levels, and thermal performance requirements to ensure the most suitable system is specified.

Our approach prioritises moisture management and breathability, selecting materials such as wood fibre boards, cork-based products, and lime plasters that allow walls to move and “breathe” naturally, preventing condensation, damp, and long-term degradation of the masonry. We meticulously design each installation to account for wall composition, internal finishes, and any existing services, ensuring minimal disruption while achieving optimal insulation performance.

Where non-breathable or modern systems are appropriate, we combine advanced vapour control layers, thermal bridging reduction, and airtight detailing to deliver high-performance results without compromising structural integrity. Each installation is completed with precision detailing around openings, skirtings, cornices, and service penetrations, maintaining the building’s character while enhancing energy efficiency.

Our experience across heritage, listed, and traditionally constructed properties allows us to provide solutions that balance regulatory compliance, conservation best practice, and modern thermal requirements, ensuring long-term durability, comfort, and sustainability in every project.