Spray foam insulation removal in Cardiff is something more homeowners are asking about, usually after a survey, a remortgage or a sale has run into trouble. Sprayed polyurethane foam applied to the underside of a roof was sold to many households as a quick fix. In some homes it has caused real problems; in others the main issue is that nobody can see what is underneath it.
We remove spray foam from roof undersides, clean and inspect the timbers, re-insulate the loft the conventional way, and give you a photo record of the work. Every job is priced after a free survey, because no two installations are the same.
Why spray foam in roofs has become a concern
Spray foam is not automatically a problem. Both open-cell and closed-cell foams are proper insulation materials, and some installations are sound. The concerns come from how and where it has been used, particularly when sprayed directly onto the underside of roof tiles, slates or felt in a loft that was designed to be cold and ventilated.
Moisture and timber
Foam applied this way can reduce ventilation in the roof space and trap moisture against the rafters, battens and roof covering. Trading Standards and the Property Care Association have both highlighted that poorly installed foam can lead to condensation, damp and timber decay. Because the foam covers the timbers, decay can go unnoticed for a long time.
Surveys, mortgages and equity release
When the rafters are covered, a surveyor cannot see their condition. Many surveyors will report that they could not assess the roof, which creates uncertainty for lenders. Some homeowners have had mortgage, remortgage or equity release applications refused or delayed as a result. The picture is not uniform: many lenders will still consider homes with spray foam and assess each case individually, often asking for a specialist report.
What the industry guidance says
RICS published consumer guidance on spray foam insulation in 2023, noting concern among lenders, particularly in equity release, and advising homeowners to get properties assessed by qualified surveyors. In 2025 the Property Care Association published a homeowner guide, alongside a protocol for surveyors assessing sprayed foam in roofs. If you have been asked for a report, start with an independent surveyor who follows that kind of assessment, before you commit to removal.
Our spray foam removal guide goes through this in more detail, including questions to ask your lender.
Is removal always the answer?
No, and anyone who tells you it always is, is selling something. Some installations do not need removing. Removal is also not a guarantee that a lender will be satisfied, as some may still want an inspection afterwards. We would always recommend:
- Finding out what your lender or buyer's surveyor actually needs.
- Getting an independent assessment if the condition of the roof is in question.
- Then deciding whether removal is the right step.
If removal is what is needed, that is where we come in. We will not pressure you to book and we will not tell you foam is dangerous when it is not.
Signs your spray foam may need attention
- A survey or valuation has flagged it, or a lender has asked for it to be assessed or removed.
- The foam is cracked, shrinking away from the rafters or falling off in pieces.
- There are damp patches, staining or a musty smell in the loft.
- You can see dark or soft timber at the edges of the foam.
- Roof tiles or slates have slipped or need repair, and roofers cannot work on them because of the foam.
How we remove spray foam
Protecting the house
Foam removal is messy. We sheet the landing, stairs and any route we use, seal the hatch area to keep dust in the loft, and set up good lighting and safe working platforms across the joists.
Mechanical removal
The foam is cut and scraped away from the rafters, battens and the underside of the felt, tiles or slates using hand tools and suitable power tools. Our team wear proper PPE throughout, including respiratory protection, eye protection and coveralls. We work carefully around the roof covering: where foam is bonded to old felt or the back of tiles, we take care not to dislodge them.
Clean-down
Once the bulk of the foam is off, we clean the timbers down so their surfaces can be seen and assessed. Some residue can remain on the back of slates or felt where it is bonded tight. We will show you exactly what is left and why.
Waste disposal
All the removed foam and contaminated insulation is bagged in the loft, carried down through the protected route and taken away for disposal. You are not left with bags in the garden.
Inspecting the timbers
With the foam off, the rafters, battens and roof covering can be seen properly for the first time in years. We check for damp, staining, soft or decayed timber, and damage to the felt or tiles, and photograph what we find. If there is decay or roof damage that needs a roofer or a timber specialist, we will tell you plainly and record it, rather than covering it up.
If there is mould on the timbers once exposed, we can treat it and sort out the ventilation as part of the job. See loft mould treatment.
Re-insulating the loft properly
Taking the foam out leaves the house without roof insulation, so we put it back the right way. In most homes that means a cold, ventilated loft with mineral wool laid on the floor to 270mm, eaves kept clear and the hatch insulated. Where the loft is used as a room or for storage, we will talk through alternatives that keep the roof ventilated.
Documentation for surveyors and lenders
When the job is done, you get a record of the work, with photographs before, during and after removal, showing the condition of the timbers once exposed and the new insulation. That gives your surveyor, lender or buyer something concrete to look at rather than an unknown.
What affects the cost
Spray foam removal is priced after a free survey. The main factors are:
- Roof area covered and the thickness of the foam.
- Type of foam and how firmly it is bonded to the felt, tiles or slates.
- Access, headroom and loft layout.
- Disposal volume.
- Re-insulation and any mould treatment or ventilation work needed afterwards.
What to expect
Removal usually takes longer than a standard insulation job, depending on roof size and the foam. We will give you a realistic timescale with your quote. There will be noise while we work, but dust is kept in the loft and the house is cleaned before we leave.
We carry out spray foam removal across Cardiff and the surrounding towns. See where we work, or call 0800 229 4668 to book a free survey.