Comfort & warmth
Warmer internal wall surface can make rooms feel noticeably more comfortable.
- Colder rooms feel improved
- Less “cold radiation” from walls
- More usable spaces year-round
ISO-THERM • Thermal Internal Wall Insulation
Warmer Walls. Less Condensation. More Comfort.
ISO-THERM helps reduce cold wall surfaces — which can lower condensation risk and help prevent mould. Ideal for colder rooms and older properties.
Comfort
Warmer wall surfaces
Dryer
Helps reduce condensation
Neat
Finished & plaster-ready
Cold Walls
Common in older homes
Better Feel
Comfort you notice daily
The Simple Explanation
Why cold walls cause problems
When warm, moist air hits a cold surface, moisture can form on the wall — that’s condensation. Over time, condensation can encourage mould growth.
Cold wall surface
External walls in older properties often get very cold in winter — especially north-facing rooms.
Moist air meets cold
Cooking, showers, drying clothes, breathing — all adds humidity. When it hits a cold wall, moisture can appear.
Mould risk
Damp surfaces + time can lead to mould and musty smells. Fixing temperature/ventilation is key.
ISO-THERM helps by warming the surface
Warmer wall surface = less condensation potential. Combine it with good ventilation for best results.
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Key Benefits
What ISO-THERM can help with
It’s not “magic insulation” — it’s a practical upgrade that improves comfort and helps tackle cold-wall condensation.
Condensation reduction
A warmer wall surface can reduce condensation conditions, especially in winter.
- Helps reduce “wet walls”
- Pairs well with ventilation
- Supports mould prevention plan
A clean finish
Designed to be finished neatly — plastered and ready for decorating.
- Smooth plaster finish
- Great for refurb projects
- Works room-by-room
Where it’s Best
Is ISO-THERM right for your home?
During your survey, we’ll advise if ISO-THERM is suitable — and whether you need ventilation improvements too.
Often a good fit if…
- You have cold external walls in winter
- Rooms suffer from condensation / mould
- You’re renovating and want a long-term upgrade
- You want comfort improvements without major external work
We may recommend alternatives if…
- There’s active water ingress (penetrating damp)
- The primary issue is rising damp needing treatment first
- Ventilation is severely lacking (we’ll fix that plan too)
- The wall condition requires repair before installation
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If damp is the main issue, see Damp Proofing.