IsoTherm Thin Internal Wall Insulation in Dorset, Hampshire & Wiltshire
IsoTherm is a thin internal wall insulation system that improves warmth and comfort without the disruption of traditional insulation. Proofterior installs IsoTherm to combat cold, damp-prone walls, reduce condensation and make hard-to-heat rooms noticeably more comfortable.
- PCA aligned & ISSE accredited
- 25-year insured guarantee
- In-house specialist team
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Genuine reviews from local homeowners
Over 200 verified reviews across Checkatrade, Google and Yell
“Excellent service from start to finish. The survey was thorough and professional, with honest, evidence-based advice rather than trying to sell unnecessary work. I came away with complete peace of mind.”
Alex Richards-Taylor
Google review
“Excellent service throughout. Ashton came out to look at an issue raised on a part-exchange survey and, rather than recommend expensive remediation, told me honestly there was nothing wrong with the wall. Great to have an honest discussion.”
Ian M.
BH16 · Damp Investigation
“Dylan and the Proofterior team were amazing. The report was incredibly comprehensive. Can’t recommend them enough.”
Sam Short
Google review
“Very pleased with the work on our living room and bedroom walls. Punctual, polite and friendly, and completed on time even though it was Easter week. Many thanks to everyone at Proofterior.”
Chris G.
BH20 · Penetrating Damp Treatment
“Dan was very thorough, professional and polite. Quick to respond and I would highly recommend.”
Malik R.
Yell · Quick & Professional
“The workmen were clean, pleasant and efficient and took just one day. The very next day we noticed a big difference with the damp issue. Many thanks.”
Nick Bennett
Google review
“Able to fit my job in for the next day and completed in a day as agreed. Not the lowest quote, but it comes with a 25-year guarantee, which I wanted — long-term peace of mind was vital.”
Alan M.
BH23 · Flat Roof Reseal
“Ashton was so friendly and informative. I’ve gone from worried to empowered — someone you can trust to do the right thing.”
Suzanna Furbank
Google review
“Really amazing service. Dan provided a really thorough damp investigation and a very helpful damp report. Very quick responses too.”
Paul A.
Yell · Damp Investigation
“Happy with the speed — a full flat survey within a week. They explained our options, the price was extremely competitive, and our tenants are pleased with their fresher, safer flat.”
Verified Customer
SP6 · Damp Proofer
“Dan provided a very professional service from start to finish. Very good communication and a first-class job.”
Mark H.
Yell · Professional Service
“Excellent service from start to finish. The survey was thorough and professional, with honest, evidence-based advice rather than trying to sell unnecessary work. I came away with complete peace of mind.”
Alex Richards-Taylor
Google review
“Excellent service throughout. Ashton came out to look at an issue raised on a part-exchange survey and, rather than recommend expensive remediation, told me honestly there was nothing wrong with the wall. Great to have an honest discussion.”
Ian M.
BH16 · Damp Investigation
“Dylan and the Proofterior team were amazing. The report was incredibly comprehensive. Can’t recommend them enough.”
Sam Short
Google review
“Very pleased with the work on our living room and bedroom walls. Punctual, polite and friendly, and completed on time even though it was Easter week. Many thanks to everyone at Proofterior.”
Chris G.
BH20 · Penetrating Damp Treatment
“Dan was very thorough, professional and polite. Quick to respond and I would highly recommend.”
Malik R.
Yell · Quick & Professional
“The workmen were clean, pleasant and efficient and took just one day. The very next day we noticed a big difference with the damp issue. Many thanks.”
Nick Bennett
Google review
“Able to fit my job in for the next day and completed in a day as agreed. Not the lowest quote, but it comes with a 25-year guarantee, which I wanted — long-term peace of mind was vital.”
Alan M.
BH23 · Flat Roof Reseal
“Ashton was so friendly and informative. I’ve gone from worried to empowered — someone you can trust to do the right thing.”
Suzanna Furbank
Google review
“Really amazing service. Dan provided a really thorough damp investigation and a very helpful damp report. Very quick responses too.”
Paul A.
Yell · Damp Investigation
“Happy with the speed — a full flat survey within a week. They explained our options, the price was extremely competitive, and our tenants are pleased with their fresher, safer flat.”
Verified Customer
SP6 · Damp Proofer
“Dan provided a very professional service from start to finish. Very good communication and a first-class job.”
Mark H.
Yell · Professional Service
What is IsoTherm Thin Internal Wall Insulation?
IsoTherm is a slim internal wall insulation designed for properties where external or thick internal insulation is impractical — particularly older, solid-wall homes. Applied to the inside face of external walls, it raises the surface temperature of the wall, which reduces the cold spots where condensation and mould typically form. Because it is thin, it improves thermal comfort while keeping the loss of internal space to a minimum, making it ideal for period and solid-wall properties.
The warning signs to look for
Catching the problem early keeps repairs simpler and less costly. If you notice any of these signs, it is worth booking a specialist survey before the damage spreads.
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- Cold walls that feel chilly to the touch
- Condensation and mould forming on internal wall surfaces
- Solid-wall property that is expensive to heat
- Rooms that never seem to warm up or hold heat
- Cold spots in corners and around external walls
- Wanting to improve comfort without losing much space
Our treatment process
Every job follows the same careful, diagnosis-first method — so you know exactly what is happening and why at each stage.
Survey of the walls, cold spots and any condensation or mould
Recommending IsoTherm where it is the right solution
Preparing and treating the wall surfaces
Installing the IsoTherm thin insulation system
Finishing ready for decoration and issuing advice
IsoTherm Thin Internal Wall Insulation — from our recent projects
Real photos from Proofterior jobs across Dorset, Hampshire and Wiltshire — carried out by our own in-house team.
Included as standard
Built to impress, built to last
Diagnosis first
We identify the real cause before recommending any treatment. No guesswork, and never unnecessary work.
In-house specialist team
Our trained team handles every project from survey to completion. No subcontractors, no compromises.
25-year guarantee
Every treatment is backed by our 25-year insured guarantee, giving you lasting protection and peace of mind.
IsoTherm Thin Internal Wall Insulation across Bournemouth, Poole & the South Coast
Proofterior is a local, in-house team providing IsoTherm Thin Internal Wall Insulation right across Dorset, Hampshire and Wiltshire. Homeowners in Bournemouth, Poole, Christchurch, Southampton, Salisbury and the surrounding towns rely on us for honest diagnosis and lasting results. Whether you are searching for IsoTherm Thin Internal Wall Insulation in Bournemouth, need a specialist in Poole, or want trusted advice anywhere along the South Coast, our surveyors know the local property styles and the problems they typically face — and we are usually with you within days.
Covering Dorset, Hampshire & Wiltshire
Local knowledge, specialist expertise and lasting protection for the home you care about.
Everything you might be wondering
By raising the internal surface temperature of cold external walls, IsoTherm reduces the cold spots where condensation forms — removing the damp conditions that mould needs to grow.
IsoTherm is a thin system specifically designed to improve warmth with minimal loss of internal room space, which makes it well suited to solid-wall and period properties.
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Get clear, honest answers about your home
A qualified specialist will visit your property, carry out a thorough inspection and give you clear recommendations in plain English — everything explained in one visit, with no obligation.