Spray Foam Insulation Warning for Homeowners in the South of England

The hidden risk spreading quietly across the region

Spray foam insulation has become one of the biggest property headaches across the South of England — from Hampshire and Dorset down to Somerset, Devon and Cornwall. What was sold as a “modern insulation upgrade” has instead created a surge of failed surveys, blocked mortgages and damaged roofs. The worst part? Many homeowners still don’t realise their loft is sitting on a ticking time bomb.

Why the South of England became a spray foam hotspot

From the early 2010s onwards, spray foam companies heavily targeted the South. Older housing stock, coastal regions and a high number of retired homeowners made counties like Hampshire, Dorset and Devon easy targets for aggressive marketing.

Cold callers promised:

• “Government-backed insulation upgrades”
• “Guaranteed savings on your heating bills”
• “Future-proof roof systems with no maintenance”

But the majority of installations ignored ventilation rules, ignored manufacturer guidance and completely sealed roofs that were never designed to be sealed. You can see how this played out nationally in our complete guide to spray foam insulation in the UK.

The mortgage meltdown hitting southern homeowners

Across the South, homeowners now face the same message from lenders: no mortgage, no remortgage, no equity release while spray foam is present in the roof.

RICS guidance is clear — properties with foam will usually fail valuation surveys until the foam is fully removed. Lenders such as Nationwide, Lloyds, Santander, Halifax and others are following this to the letter. As a result, many homeowners are only discovering the problem when they try to sell or remortgage.

Manufacturers said roofs must stay ventilated — installers didn’t listen

Brands such as Icynene, Lapolla, Isothane, Huntsman and BASF all publish installation guidelines stating that roofs must remain ventilated and moisture must be managed correctly.

In reality, installers often:

• sprayed directly onto non-breathable felt
• sealed rafters from eaves to ridge
• blocked natural ventilation routes
• ignored condensation and mould risk

The result? Thousands of roofs across the South now have trapped moisture, hidden mould and weakened timbers — and lenders will not take that risk on.

The rise of cowboy removal companies along the South Coast

Because demand for removal is now huge, the South has a new problem: unqualified removal firms.

Many are the same operators who installed foam years ago, now trading under new names. They cold call homeowners again, offering “quick cheap removal”, but frequently:

• fail to remove all foam residue
• damage felt, tiles and rafters
• dump waste illegally without paperwork
• provide no photographic proof or lender-ready documentation

We’ve seen roofs in Dorset, Somerset and Devon ruined because a cowboy removal team “scraped the surface and left”, leaving the homeowner to pay a second time for the job to be done properly.

How homeowners in the South can spot the red flags

You should walk away instantly if a company:

• gives a verbal quote only
• has no VAT registration number
• refuses to provide a physical business address
• cannot show a valid waste carrier licence
• won’t provide written proof of previous work
• offers “today only” discounts or high-pressure sales
• cold calls you out of the blue

Professional spray foam removal specialists simply do not operate like this.

What proper spray foam removal actually looks like

True RICS-compliant removal is a structured process, not a quick scrape-and-go job. It should include:

• identifying foam type (open cell or closed cell)
• controlled mechanical extraction (no heat guns on rafters)
• industrial vacuum systems to control dust and debris
• full residue removal from timbers, felt and tiles
• restoring clear ventilation routes at eaves and ridge
• legal waste transfer documentation
• photographic before-and-after evidence
• completion paperwork suitable for RICS re-survey

This is the standard that Carbon Zero Solutions Ltd work to on every job across the South of England.

After the foam is gone – hidden issues that need fixing

Many roofs in Devon, Cornwall and Dorset still suffer long after the foam has been removed, because:

• moisture was trapped for years behind the foam
• mould formed on felt and timbers
• rafters and sarking boards stayed damp
• ventilation was never properly restored

That’s why Carbon Zero Solutions Ltd often follow removal with targeted ventilation upgrades (lap, ridge or soffit vents) and fresh breathable insulation such as Actis Hybris insulation or Knauf mineral wool loft insulation. A roof can’t recover unless the airflow and insulation are both put right.

Why the South of England has been hit so hard

The South’s mix of coastal climate, higher humidity, older housing stock and a large retired population created the perfect storm. Add in years of hard-sell marketing and “eco scheme” claims, and counties such as Hampshire, Dorset, Devon and Cornwall now have some of the highest spray foam removal rates in the UK.

The hidden cost of bad removal

Poor removal can be worse than the foam itself. We’ve seen:

• foam residue left on rafters and felt, still trapping moisture
• heat guns and solvents used on timbers (a serious fire and damage risk)
• felt burned or torn away without proper repair
• lofts left unventilated again, causing further condensation
• lenders rejecting “removal” because proof and residue checks failed

Carbon Zero Solutions Ltd has repaired countless botched jobs across the region where homeowners have already paid once and are forced to pay again to get the work up to RICS standard.

Restoring mortgage approval

To pass a RICS re-survey and satisfy lenders, homeowners normally need:

• clear photographic before-and-after evidence
• written confirmation that all foam has been removed
• waste transfer notes from a licensed carrier
• evidence that ventilation has been restored
• a completion report suitable for the surveyor and lender

Carbon Zero Solutions Ltd provide all of this as standard, helping homeowners move from “survey fail” back to mortgage-ready status.

Government inaction and consumer risk

Despite the scale of the problem, there is still:

• no government investigation into spray foam manufacturers
• no compensation scheme for affected homeowners
• no regulation of removal companies
• no oversight of how products were originally sold

That leaves homeowners carrying the full cost and responsibility for getting foam removed safely — which makes choosing a reputable company even more critical.

How Carbon Zero Solutions Ltd are helping homeowners in the South

Operating across Hampshire, Dorset, Wiltshire, Somerset, Devon and Cornwall, Carbon Zero Solutions Ltd lead the way in safe, compliant spray foam removal. We provide:

• free, no-obligation surveys
• no cold-calling — ever
• full insurance and VAT registration
• licensed waste removal with documentation
• photographic proof and RICS-ready reports
• ventilation and insulation upgrades where required

If your home has spray foam, don’t wait

Foam doesn’t improve with time. Condensation doesn’t clear on its own. Survey failures won’t disappear. The sooner the problem is assessed, the simpler it is to resolve.

Related reading:
Spray Foam Removal •
Spray Foam Insulation UK Guide •
Loft Insulation •
Felt Lap Vents •
Actis Hybris