𧱠Thin Internal Wall Insulation (ISO-THERM / TIWI) β North Wales, Cheshire, Wirral, Wrexham, Chester & Flintshire
Cold internal walls, condensation, and black mould are common problems across North Wales, Cheshire, Wirral, Wrexham, Chester, and Flintshire. These issues cause discomfort, damage plaster and dΓ©cor, and affect indoor air quality.
At Quirks Property Maintenance Ltd, we professionally install ISO-THERM Thin Internal Wall Insulation (TIWI) β a low-profile, breathable system that raises wall surface temperature, reduces heat loss, and prevents recurring condensation and mould β all without changing your propertyβs exterior.
π What Is Thin Internal Wall Insulation?
ISO-THERM (TIWI) is a vapour-permeable yet waterproof internal lining applied directly to existing walls. Once plaster-skimmed, it looks and feels like a normal wall β but itβs warmer, drier, and more energy-efficient.
With a finished thickness of only 10 mm, ISO-THERM is ideal where space is limited or external insulation isnβt suitable (for example, heritage buildings, stone cottages, or listed properties).
π‘οΈ Benefits of ISO-THERM Thin Internal Wall Insulation
π§ Stops condensation and black mould
π₯ Raises internal wall temperature for greater comfort
π¨ Vapour-permeable yet water-resistant β allows walls to breathe
π Minimal space loss (approx. 10 mm build-up)
β‘ Improves energy efficiency and reduces heating costs
𧱠Suitable for solid-wall and heritage homes
π§° Quick, clean, and low-disruption installation
β»οΈ Non-toxic, durable, and fire-resistant
π‘ How ISO-THERM Works
Condensation forms when warm, moist air hits a cold surface.
ISO-THERM prevents this by creating a warm, breathable internal layer that raises the wallβs temperature above the dew point.
Its vapour-open structure lets walls dry naturally while the water-resistant coating repels surface moisture and salt migration. Once plastered, itβs ready for painting or wallpapering just like any standard wall.
π§° Our Installation Process
π Inspection & Diagnosis β Identify condensation patterns, cold spots, and moisture sources.
𧽠Preparation β Clean surfaces, treat mould, and apply primers where needed.
𧱠Installation β Fix ISO-THERM with specialist adhesive across walls, reveals, and around sockets/radiators.
π¨ Finishing β Plaster skim to achieve a smooth, ready-to-decorate surface (~10 mm total depth).
π¬οΈ Aftercare β Guidance on ventilation and humidity management for lasting results.
β Why Choose Quirks Property Maintenance
With over 20 yearsβ experience in insulation, condensation control, and damp prevention, Quirks Property Maintenance delivers effective, long-lasting solutions across North Wales, Cheshire, Wirral, Wrexham, Chester, and Flintshire.
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Fully insured
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Manufacturer-approved installation
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12-month workmanship guarantee
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Clear written quotations
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Tidy, respectful working practices
π ISO-THERM Across Our Service Areas
π‘ North Wales
Homes in Denbigh, Rhyl, Prestatyn, Colwyn Bay, Llandudno, and Bangor often suffer cold-wall condensation from coastal exposure. ISO-THERM provides a discreet, breathable solution that improves comfort and stops mould β without external changes.
𧱠Cheshire
In Chester, Ellesmere Port, Northwich, Winsford, Nantwich, and Warrington, older solid-wall homes benefit from ISO-THERMβs slimline insulation that raises surface temperatures while preserving internal space.
π Wirral
Coastal homes in Birkenhead, Wallasey, Heswall, Hoylake, West Kirby, and Bromborough face persistent damp and mould. ISO-THERM creates a warm, moisture-resistant surface that keeps interiors dry and comfortable all year.
ποΈ Wrexham
Traditional houses in Rhos, Ruabon, Rossett, Llangollen, Chirk, and Gresford often lack cavity insulation. ISO-THERM offers a thin, breathable upgrade that reduces moisture and enhances warmth.
π° Chester
From Hoole and Boughton to Christleton and Upton, ISO-THERM provides a conservation-friendly way to stop condensation on north-facing or external walls β perfect for period homes.
𧱠Flintshire
Based locally in Ewloe, Quirks has improved comfort in hundreds of homes across Mold, Buckley, Connahβs Quay, Hawarden, Shotton, and Holywell. ISO-THERM raises wall temperatures, prevents moisture build-up, and protects finishes long-term.
π§ Complementary Services
π¬οΈ Ventilation Upgrades (DMEV/MEV) to regulate humidity
𧱠Damp-Proofing, Repointing & Brick Repairs
πͺ Roofing, Guttering & Detailing Improvements
π Thermal Imaging & Moisture Diagnostics
π Inspection & Quotation Service
If your property suffers from cold walls, condensation, or black mould, contact Quirks Property Maintenance Ltd for a professional inspection and quotation.
Weβll assess affected areas, explain suitable options, and provide a detailed written proposal outlining scope, specification, and timescales.
π§ Email: info@quirksonline.co.uk
π± Phone: 01244 638219
β Why Choose Quirks Property Maintenance Ltd?
β Over 20 years of damp proofing experience
β Members of the Federation of Damp (FOD), working to recognised industry standards
β PAM TIES and Safeguard Approved Contractors
β Specialists in Rising Damp, Penetrating Damp, Condensation, Wet Rot & Dry Rot
β Fully insured, Health & Safety compliant and Building Control approved
β All work completed by our in-house team
β Long-term guarantees available on approved installations
β Covering Flintshire, Chester, Wrexham, Cheshire, Denbighshire, Conwy, Wirral & North Wales
β Frequently Asked Questions β ISO-THERM / TIWI
What is ISO-THERM Thin Internal Wall Insulation?
𧱠A vapour-permeable yet waterproof internal insulation that raises wall temperatures and prevents condensation and mould.
Will ISO-THERM stop mould completely?
π§ Yes β when properly installed and combined with good ventilation, ISO-THERM removes the cold surface conditions mould needs to grow.
How thick is it?
π Around 10 mm total build-up, including the plaster skim β minimal space loss.
Can it be used on any wall type?
Yes β brick, stone, block, or plastered surfaces. Substrates are always prepared to ensure strong adhesion.
Is it suitable for listed buildings?
β
Perfect for conservation areas and listed buildings where external changes arenβt allowed.
How long does installation take?
β±οΈ Usually 2β3 days per room, depending on prep and drying time.
Is it messy?
π§Ή No β we use dust protection and leave all areas clean and tidy.
Can I decorate over it?
π¨ Yes β once dry, you can paint or wallpaper as normal.
What about rising or penetrating damp?
β οΈ We treat any structural damp first to ensure long-term results.
Does it work with ventilation systems?
π¬οΈ Yes β it complements DMEV/MEV ventilation perfectly for humidity control.
How long will it last?
π Decades of performance when installed to specification.
Do you guarantee your work?
β
All installations come with a 12-month workmanship guarantee
Where do you install ISO-THERM?
π Across North Wales, Cheshire, Wirral, Wrexham, Chester, and Flintshire, including Denbigh, Rhyl, Llandudno, Mold, Buckley, Ellesmere Port, Northwich, and Hoylake.
