Isotherm Internal Wall Insulation Specialists for UK Homes – Condensation control, warmer walls, and moisture-safe thermal improvement
Cold internal wall surfaces are a common cause of condensation, mould growth, and discomfort in homes, particularly in solid-wall or poorly insulated properties. Decorative solutions may temporarily mask symptoms, but they do not address the underlying thermal imbalance. At Proofterior, Isotherm internal wall insulation is specified as part of a survey-led approach to raise surface temperatures, manage moisture safely, and improve overall comfort without reducing room space significantly.
Isotherm is a thin internal wall insulation system designed to combat condensation by increasing the surface temperature of walls. It works by creating a thermal barrier that reduces the likelihood of warm, moist air condensing on cold surfaces. This solution is particularly effective in rooms affected by cold walls, recurring condensation, and mould growth, such as kitchens, bathrooms, and bedrooms.
Unlike conventional insulation boards, Isotherm adds thermal resistance while maintaining vapour control, making it suitable for moisture-sensitive environments when correctly specified.
Condensation forms when warm, moisture-laden air comes into contact with cold internal surfaces. Isotherm addresses this by improving surface temperatures and supporting moisture control across the wall system.
Increases Wall Surface Temperature
By improving insulation at the internal surface, Isotherm helps walls remain warmer. This reduces the likelihood of warm air cooling rapidly and condensing when it meets colder wall areas.
Supports Humidity Control
Isotherm works alongside existing or upgraded ventilation systems to help regulate indoor humidity. By reducing cold surfaces, it limits the conditions that allow moisture to settle and linger.
Acts as a Moisture Control Layer
The insulating layer helps manage vapour movement at the wall surface, reducing moisture interaction with the underlying structure and protecting it from condensation-related damage.
Improves Energy Efficiency
Alongside condensation control, Isotherm reduces heat loss through walls, helping retain warmth within the property and lowering heating demand over time.
Repeated cleaning without addressing the cause often leads to frustration, with mould returning in the same locations or appearing elsewhere in the property. Early assessment helps prevent escalation and reduces the need for repeated treatments or wider remedial works.
Slimline Design
With only a minimal thickness added to the wall, Isotherm provides effective thermal improvement without significantly reducing room size. This makes it suitable for both compact rooms and larger living spaces.
Helps Prevent Mould Growth
By reducing cold spots where condensation typically forms, Isotherm removes the conditions that allow mould to thrive on internal wall surfaces.
Enhances Home Comfort
Warmer wall surfaces and reduced dampness create a more comfortable and healthier indoor environment for occupants throughout the year.
Efficient Installation
Isotherm can be installed with minimal disruption compared to traditional internal wall insulation systems, making it a practical upgrade for occupied homes.
Compatible with Multiple Wall Types
Isotherm is suitable for a range of substrates, including plastered walls, masonry, brick, and concrete, allowing it to be used across different property styles and ages.
Internal wall insulation may be appropriate if you are experiencing one or more of the following issues:
Persistent condensation forming on walls
Damp patches or recurring water staining
Mould growth, particularly in corners or behind furniture
Cold, uncomfortable wall surfaces, especially in winter
These symptoms often indicate low surface temperatures rather than leaks and should be assessed before treatment is specified.
See Isotherm in Action
This installation shows how Isotherm internal wall insulation is fitted neatly with minimal disruption. The slim profile improves wall surface temperatures, helping reduce condensation, mould risk, and cold spots without noticeably reducing room space.
All Isotherm works are specified following assessment of wall conditions and moisture behaviour, ensuring the insulation supports long-term comfort and energy efficiency.
Areas We Cover
Proofterior provides independent damp surveys and specialist damp proofing services across Dorset, Hampshire, and surrounding areas. We work with homeowners, landlords, property managers, and buyers who need clear answers, accurate diagnosis, and long-term solutions, not guesswork or sales-driven recommendations.
FREQUENTLY ASKED QUESTIONS
Will ISO-THERM Thin Internal Wall Insulation fix condensation and mould on internal walls?
SO-THERM raises wall surface temperatures, which helps prevent condensation and the black mould that follows. For persistent issues, we pair insulation with ventilation upgrades or damp repairs so the finish stays clean and dry long-term.
Do I need damp proofing or ventilation work before ISO-THERM Thin Internal Wall Insulation?
If we find penetrating damp, leaks, or heavy condensation, we’ll fix the moisture source first. Insulation works best when the wall is dry and sound, and combining ISO-THERM with condensation control gives the most reliable outcome.
Can ISO-THERM Thin Internal Wall Insulation go behind radiators or large furniture?
Yes—these are common cold spots. We can remove and refit radiators, insulate behind them, and redecorate for a tidy result that reduces heat loss and surface condensation.
Will ISO-THERM Thin Internal Wall Insulation lower my heating bills?
By increasing internal surface temperature, rooms feel comfortable at lower thermostat settings and warm up faster, which can reduce heating demand. Actual savings vary by property, usage, and accompanying ventilation/draught-proofing.