Isotherm Roll 7 m² – Ultra-Thin Internal Wall Insulation Membrane for Damp Control & Energy Efficiency
 
Isotherm Roll 7 m² (Membrane Only) is an innovative, textile-based thin internal wall insulation (TIWI) solution designed to upgrade thermal comfort and combat damp in solid-wall properties. At approximately 4 mm thick and supplied in 1-metre-wide rolls, this sleek membrane is perfect for use in both residential and commercial settings—delivering rapid energy savings with minimal installation disruption.
This slim insulation option adheres directly to plastered walls using a compatible mineral-based adhesive (sold separately), greatly simplifying installation. Its flexibility lets you cut and contour the membrane to fit windows, outlets, reveals, architraves, and skirting boards without the need for removal—making it an excellent retrofit choice for renovation projects.
Installers love this superior alternative to bulky insulation solutions: it retains wall depth, speeds up fit-out, improves indoor warmth, and reduces the risk of moisture-related issues like mould and mould growth. Highly effective for both heritage restoration and modern energy efficiency upgrades, this membrane integrates seamlessly into broader damp proofing strategies.
Key Benefits
Compact ultra-thin membrane (approx. 4 mm thick) preserves room space.
Flexible textile design cuts and fits around lights, reveals, and trims without demolition.
Improves wall thermal performance while reducing internal condensation and damp.
Ideal for retrofit projects on solid or uninsulated masonry walls.
Quick, clean installation—just adhere using recommended adhesive (available separately).
Optimises energy efficiency and comfort in homes, offices, and commercial buildings.
Typical Applications
Retrofitting insulation on solid-wall properties with limited internal space.
Installing thermal lining before plastering and painting.
Protecting internal walls in older or higher-moisture environments from damp and mould.
Room-by-room renovation where preserving profiles and avoiding demolition is key.
Improving energy performance in rentals, offices, and living spaces without major upheaval.
Product & Installation Details
Supplied as a single roll covering 7 m².
Ultra-thin and lightweight, supporting easier handling and installation.
Applied with a separate mineral-based adhesive designed for TIWI membranes.
Can be readily trimmed on-site for window reveals, plug sockets, and skirting integration.
Complements broader wall renovation workflows—after adhesion, finish with plaster or paint for a seamless surface.
Why Choose Isotherm Roll 7 m² Membrane?
This advanced insulation membrane stands out for its low-profile design, moisture mitigation capabilities, and simple installation. It’s perfect for renovation projects where wall thickness and finish preservation matter. By improving thermal retention and preventing damp-related damage, Isotherm Roll enhances wall comfort and supports efficient, discreet retrofit work in domestic and commercial environments.
 
Thin Internal Wall Insulation
ISO-THERM is an innovative ultra-thin thermal wall insulation. It keeps internal walls warm and dry, helping prevent damp and mould issues. The patented textile-based Thin Internal Wall Insulation (TIWI) is ideal for both residential and commercial properties. ISO-THERM insulation is effective as part of a damp proofing strategy, with the added benefit of improving energy efficiency by warming walls.
 
ISO-THERM internal wall insulation comes in 1-metre-wide rolls with an ultra-thin (+/-4mm) profile. It’s quick and easy to apply directly to plastered walls with a special mineral-based adhesive (available separately). The internal wall insulation’s flexibility means it can be easily cut to accommodate fixtures and fittings, it fits into window reveals and you don’t necessarily need to remove architraves and skirtings.
ISO-THERM is an excellent alternative to thicker wall insulation for dealing with the issues associated with uninsulated solid wall properties. It is less disruptive to install, cheaper and avoids the moisture problems made worse by some types of retrofit insulation.
We sell ISO-THERM insulation rolls and adhesive tubs separately or together as a convenient kit.