Ultra Thin 4mm Internal Wall Insulation for Solid Walls
ISO-THERM - Thin Internal Wall Insulation
Reduce cold walls & condensation without bulky boards or major disruption. Now the user instantly understands the outcome. ISO-THERM – Thin Internal Wall Insulation Cold internal walls, condensation, and recurring damp are common problems in older and solid-wall properties. The ISO-THERM Internal Wall Insulation 7.125 m² Kit provides an ultra-thin, highly effective solution designed to improve thermal performance while resisting moisture transfer. At just ±4mm thick, ISO-THERM reduces heat loss and surface condensation without sacrificing valuable room space or requiring disruptive building work.
If you’re struggling with cold walls, condensation, or damp showing through internal finishes, the ISO-THERM Internal Wall Insulation 7.125 m² Kit offers a modern, space-saving solution. This patented, ultra-thin insulation helps warm internal wall surfaces while preventing lateral damp transfer, reducing the conditions that lead to mould growth and surface salts — all with minimal disruption to your home.
✔ Ultra thin ±4mm system ✔ Ideal for solid wall properties ✔ Minimal room space loss ✔ No battening required ✔ Fast UK delivery available
ISO-THERM Internal Wall Insulation 7.125 m2 Kit
IN STOCK
£299.99 Inc VAT
⭐⭐⭐⭐⭐ Trusted UK Supplier Secure Checkout | Fast Delivery
ISO-THERM – Internal Wall Insulation - 0.95m x 7.5m
IN STOCK
£233.99 Inc VAT
⭐⭐⭐⭐⭐ Trusted UK Supplier Secure Checkout | Fast Delivery
ISO-THERM Installation Guide (Step-by-Step)
Before installation, ensure the wall is solid, clean, and free from dust or loose coatings such as flaking paint. For best performance, ISO-THERM should be applied to bare plaster, with previous finishes removed. In many cases, skirting boards and architraves can remain in place, helping to minimise disruption.
⏱ Estimated time: 30–60 minutes per wall (depending on preparation required)
Ensure the wall surface is sound, clean, and free from dust or loose coatings such as flaking paint. For best results, ISO-THERM should be applied to bare plaster, with all previous wall coverings or coatings removed. Depending on their size, existing skirting boards and door architraves may not need to be removed, helping to reduce disruption during installation.
ISO-THERM adhesive is supplied ready to use. Apply directly to the wall using a 5mm notched trowel, forming horizontal ribs across the surface. The adhesive layer should not exceed 3mm in depth to ensure correct bonding and finished thickness.
⏱ Estimated time: 15–25 minutes per wall
This ensures even coverage and optimal bonding.ISO-THERM adhesive is supplied ready to use. Apply it directly to the wall using a 5mm notched trowel, forming horizontal ribs across the surface to a maximum depth of 3mm. This ensures even coverage and optimal bonding.
Starting from the top of the wall (similar to hanging wallpaper), roll the ISO-THERM insulation into the adhesive. Align edges carefully with the previous section. Smooth by hand, then firmly roll into place using a wallpaper press roller or similar tool to achieve full adhesion.
⏱ Estimated time: 20–30 minutes per wall
Ensure each section aligns closely with the previous piece. Smooth the insulation by hand, then firmly roll it into the adhesive using a wallpaper press roller or similar tool to achieve full contact.
Once the adhesive has fully cured, ISO-THERM can be plastered directly. After the skim coat has dried completely, finish with a breathable paint. The total finished wall depth, including plaster, is approximately 10mm.
⏱ Estimated time: 1–2 hours
| Small bedroom | 2–3 hours |
| Medium room | 3–4 hours |
| Large room | 4–5 hours |
Times assume reasonable wall condition and standard access.
DIY Installation – Suitable If:
You’re confident with basic wall preparation
You’ve used adhesives or wallpaper-style systems before
Walls are flat, dry, and structurally sound
Pros:
✔ Lower cost
✔ Flexible timing
✔ Minimal tools required
Considerations:
⚠ Care needed around sockets & switches
⚠ Surface preparation is critical
⚠ Poor adhesion affects performance
Professional Installation – Recommended If:
Walls show signs of damp or salt contamination
Property is older or solid-wall construction
You want a guaranteed, high-quality finish
Pros:
✔ Faster installation
✔ Correct detailing around reveals & fixtures
✔ Ideal for damp-prone areas
✔ Professional plaster finish
Best for: Whole rooms, basements, rental properties, or refurb projects.
Data Sheet & Case Study
ISO-THERM Internal Wall Insulation – FAQs
ISO-THERM is an ultra-thin (±4mm) patented polyester-based thermal insulation and damp-proofing material. It is designed to improve thermal performance, reduce condensation, and prevent mould growth on internal walls without significantly reducing room space.
Key Benefits
Ultra-thin insulation with high thermal performance
Helps prevent condensation, damp, and surface mould
Vapour permeable yet waterproof
Minimal loss of internal space
Suitable for residential and commercial use
Fast application with minimal disruption
ISO-THERM is suitable for internal walls affected by cold spots, condensation, damp, or mould. It can be applied directly to sound plastered walls and is ideal for homes, flats, offices, and commercial buildings.
Ease of Installation
ISO-THERM is lightweight, flexible, and easy to work with. It can be cut neatly around:
Light switches and sockets
Radiator brackets
Window reveals
Door architraves and skirting boards (often left in place)
Its flexibility allows it to fit awkward areas with ease, making installation minimally invasive.
The system is fixed using the dedicated ISO-THERM adhesive, typically trowelled onto the wall at around 5mm thickness. The ISO-THERM – Thin Internal Wall Insulation is then pressed and rolled into the adhesive. Once installed, the surface can be finished with a direct plaster skim coat.
The overall finished wall depth after plastering is approximately 10mm.
ISO-THERM is vapour permeable but waterproof. This means it allows the wall to breathe while resisting lateral damp transfer. It prevents the formation of surface salts such as nitrates and chlorides and significantly reduces the risk of mould growth.
Thanks to its high thermal efficiency, ISO-THERM helps raise internal wall temperatures, reducing cold surfaces where condensation typically forms. This improves comfort levels and energy efficiency within the property.
Large wall areas can be treated in a short space of time. Apart from plastering and painting, disruption is kept to an absolute minimum, making it ideal for occupied properties.
ISO-THERM Adhesive is a ready-to-use mineral adhesive composed of stabilised potassium silicate, siliceous aggregates, quartz sand, and specialist additives. It is vapour permeable, water repellent, and designed specifically for use with the ISO-THERM system.
Shop with confidence. Shop with us.
PAM Ties & Builders Superstore have been providing goods to the building trade since 1991, and as you can imagine over that time we’ve built up quite the reputation for great value and the highest levels of customer satisfaction.
Our websites are secure and easy to use, with tens of thousands of products available from the best names in the industry.
Does that mean we never get it wrong? Of course not, but in those tiny number of cases, you’ll find we pull all of the stops out to put things right for you.
We Provide:
- Low Prices
- Fast, Free, UK WIde Delivery
- Over 30,000 Products Online
- All The Top Work Brands
- Visa, Mastercard, Amex, Apple Pay, Google Pay & Pay Pal
- Secure Shopping Guaranteed
- Providing Quality & Value Since 1991
- Family Run Business