Thin Wall Insulation (Mould & Condensation Control)

Cold internal walls are one of the main causes of condensation and recurring black mould. Our range of thin wall insulation systems is designed to improve surface temperatures, reduce condensation risk and create a healthier indoor environment.

Unlike surface mould treatments that deal with the visible problem, thin internal wall insulation works by addressing the conditions that allow mould to form in the first place. By reducing cold bridging and increasing wall surface temperature, products such as TIWI help prevent moisture from settling on walls — a key factor in condensation-related mould growth.

Thin wall insulation is particularly effective in properties with solid walls, cold corners or areas prone to repeated mould issues. When installed as part of a wider condensation control strategy — alongside improved ventilation such as PIV units or extractor fans — it forms a long-term solution rather than a temporary fix.

If you’re experiencing black mould on external-facing walls, learn more about identifying and treating the issue in our guide on how to remove black mould from walls.

Suitable for both trade installers and experienced DIY users, our thin wall insulation products provide a practical way to tackle condensation at its source.