A growing number of homeowners with spray foam roof insulation are facing mortgage delays, failed property sales and equity release complications as lenders tighten scrutiny around properties where roof timbers cannot be fully inspected.
Property specialists at Timberwise say concerns are increasingly centred on surveyors being unable to properly assess the condition of roof structures hidden beneath spray foam insulation, creating uncertainty for lenders during the mortgage approval process.
The company warns that restricted visibility within roof spaces can make it difficult to identify condensation, trapped moisture or timber decay, particularly in older homes where ventilation problems or historic leaks may already exist.
Timberwise is advising homeowners planning to sell, remortgage or apply for equity release to check the condition of any spray foam insulation installed in their property and ensure all installation paperwork, guarantees and certification are readily available before the survey stage.
SALEABILITY ISSUES
George Edwards (main picture, inset), Managing Director of Timberwise, says: “Lenders and surveyors are looking at risk.
“If spray foam prevents proper inspection of the roof timbers, surveyors may not be able to confirm the condition of the structure underneath. That uncertainty alone can affect mortgage decisions, remortgaging, and the saleability of a property.”
The company said one of the main concerns is that spray foam insulation can conceal developing issues within the roof structure.
“A roof can appear perfectly sound externally while hidden condensation, timber decay or trapped moisture is developing underneath the insulation,” Edwards said.
“If surveyors cannot fully inspect rafters and supporting roof timbers, lenders may consider the risk too high.”
COMPROMISED AIRFLOW
Timberwise says concerns have increased particularly around older properties where airflow within roof spaces may already be compromised.
Edwards adds: “Open cell foam remains softer and less dense once cured, while closed cell foam becomes rigid and can act as a vapour barrier.
“That difference matters because roofs need to manage moisture movement correctly. If ventilation routes become restricted or moisture becomes trapped against timber, condensation and timber decay risks can increase significantly over time.”
The firm also warns homeowners to be cautious about cold callers pressuring them into costly removal work.
“Some homeowners panic when they hear spray foam may affect mortgages, but immediate removal is not always necessary,” Edwards says.
“Every roof should be assessed individually because the level of risk can vary significantly depending on the condition of the roof, the type of foam used and how it was installed.”
