Internal Wall Insulation That Keeps Heat In — and Damp Out
Thin or plasterboard-based internal wall insulation dramatically reduces heat loss through solid walls, helping your home stay warmer, drier, and more energy efficient. Our expert systems improve comfort, prevent condensation, and preserve your property’s character — all with minimal disruption and long-term results.
Enquire About Internal Wall Insulation
KDS Insulation Delivers Warmth, Dryness, and Efficiency
We install internal wall insulation using either insulated plasterboard or our ultra-thin ISO-THERM system — both designed to reduce heat loss, prevent condensation, and improve comfort.
Whether you’re upgrading a solid-walled home or treating damp-prone rooms, our expert team ensures a clean, efficient installation tailored to your property.
Insulated walls help maintain a consistent indoor temperature, reduce draughts, and lower heating bills. ISO-THERM goes further by controlling moisture movement within the wall — stopping mould before it starts and supporting a healthier indoor environment.
Crucially, internal wall insulation preserves your home’s external appearance, making it ideal for listed buildings or properties with architectural character. The result: a warmer, drier, and more energy-efficient home — without compromise
Certified Installers
Fast Turnaround
Satisfaction Gurantee
Which Internal Wall Insulation System Is Right for You?
| Feature | Insulated Plasterboard | Thin Wall Insulation (ISO-THERM) |
|---|---|---|
| Thin Wall Insulation (ISO-THERM) | Solid walls, older homes, full thermal upgrade | Damp-prone rooms, listed buildings, space-sensitive areas |
| Thickness | Moderate — adds insulation and a finished surface | Ultra-thin — minimal impact on room size |
| Moisture Control | Helps reduce condensation | Actively prevents mould and lateral damp movement |
| Installation Method | Boards fixed directly to internal walls | Vapour-permeable, waterproof layer applied to wall |
| Preserves External Appearance | ✅ Yes | ✅ Yes |
| Acoustic Benefits | ✅ Yes | ✅ Yes |
| Ideal For Retrofit Projects | ✅ Yes | ✅ Yes |
Why KDS Internal Wall Insulation
Thermal Performance That Cuts Bills
Internal wall insulation reduces heat loss through solid walls, helping your home stay warmer for longer. Whether you choose insulated plasterboard or ISO-THERM, you’ll benefit from lower energy use and reduced heating costs.
Moisture Control & Mould Prevention
Our ISO-THERM system is vapour-permeable and waterproof — designed to stop lateral damp movement and prevent mould-causing salts from forming. It’s ideal for treating existing condensation issues and preventing future ones.
Space-Saving & Character-Friendly
ISO-THERM’s ultra-thin design preserves internal space, while both systems maintain your home’s external appearance — perfect for listed buildings or properties with architectural features.
Expert Installation & Full Guarantee
Our trained professionals install each system with precision and care. All work is fully guaranteed and backed by manufacturer warranties, with optional building control certification for added peace of mind.
Frequently Asked Questions
What is internal wall insulation (IWI)?
IWI involves fitting insulation to the inside of external walls to reduce heat loss, improve comfort, and help control condensation. It’s ideal for older homes with solid walls or properties where cavity wall insulation isn’t suitable.
What types of internal wall insulation do you offer?
We offer two systems: insulated plasterboard for strong thermal performance and ISO-THERM thin wall insulation for space-saving mould and condensation control.
Will it reduce the size of my room?
Insulated plasterboard adds moderate thickness, while ISO-THERM is ultra-thin and designed to minimise space loss — ideal for smaller rooms or character properties.
Does it help with damp or mould?
Yes. ISO-THERM is vapour-permeable and waterproof, preventing lateral damp movement and stopping mould-causing salts from forming. It’s effective for both treatment and prevention.
Is internal wall insulation suitable for listed buildings?
Absolutely. Both systems preserve your home’s external appearance, making them ideal for listed buildings or properties with architectural character.
Will it make my home warmer?
Yes — internal wall insulation helps maintain a consistent indoor temperature, reduces draughts, and lowers heating bills.
Is it eco-friendly?
All work is fully guaranteed and backed by manufacturer warranties. Where required, installations can be certified by local building control and issued with a Building Regulations certificate.
Instant Comfort — and Double the Savings
Why Internal Wall Insulation Matters
Heat Loss Through Walls Wastes Energy
Without internal insulation, up to 35% of your home’s heat can escape through the walls — making rooms colder and energy bills higher.
Condensation and Damp Disrupt Comfort
Uninsulated walls stay cold, allowing moisture to settle and mould to form. This leads to uneven temperatures, poor air quality, and long-term damage.
Insulation Creates a Thermal and Moisture Barrier
Internal wall insulation raises surface temperatures, reduces draughts, and helps prevent mould — improving comfort, lowering heating demand, and protecting your home from damp.
