Spray foam insulation and the mortgage problem
Most high-street mortgage lenders refuse loans on properties with spray foam insulation in the roof, because it hides timber condition and traps moisture. Removal costs £2,000 to £4,000 including the timber condition report lenders want, and usually gets a blocked sale or remortgage moving again within weeks.
How Teesside got here
Through the 2010s, spray foam was sold aggressively across Teesside, often door-to-door, often to older homeowners, as an energy upgrade that would add value. Open-cell foam was sprayed onto the underside of thousands of local roofs. The sales pitch skipped two facts: foam bonded to the felt traps moisture against the roof timbers, and it makes the roof structure impossible to inspect. Years later, those two facts have become one problem: lenders won't lend on it.
Why lenders refuse
The valuer can't see the timbers, so the lender can't assess the roof's condition, so the property fails the standard lending criteria. It is that mechanical. Some lenders decline outright; some demand removal; a handful consider closed-cell with full documentation. The practical experience across hundreds of Teesside sales: plan on removal being required.
What removal actually looks like
Manual, rafter by rafter: the foam is cut and scraped from the timbers and membrane, bagged and disposed of, over two to four days. Then the part that unblocks the mortgage, a written timber condition report: moisture readings, photographs of every elevation, any decay identified and treated. Removal without the report is half a fix; the report is what the buyer's lender files.
The numbers
£2,000 to £4,000 for a typical Teesside roof: size, foam thickness and access set the price, and waste disposal is a genuine cost line. Against a collapsed sale (or a £10,000 price chip to a cash buyer), it is usually the cheapest route through. After removal, the loft typically goes back to conventional 270mm mineral wool at £400 to £800, which performs better and no lender has ever objected to.
If you're not selling
Don't panic, but do get the timbers checked. A dry foamed roof can wait and be planned for; a wet one is rotting quietly. A moisture survey (£100 to £200, often folded into a removal quote) tells you which one you have.