Open-Cell Spray Foam Mortgage Issues
Open-cell foam is sometimes accepted by UK lenders — here's how to maximise your chances, and when removal is still the safer route.
Why open-cell is treated more leniently
Open-cell foam is softer, more breathable and far easier to remove than closed-cell. Some lenders accept it with full documentation, particularly when applied between rafters with appropriate ventilation maintained.
When open-cell still fails
- No installer documentation.
- Foam applied directly to membrane with no ventilation gap.
- Visible signs of moisture or condensation.
- Aged installations with no recent inspection.
Improving your position
Get an independent inspection that confirms foam type, breathable application and timber condition. Combined with installer paperwork, this satisfies a meaningful minority of UK lenders.
Frequently asked questions
How do I know if it's open or closed cell?＋
Open-cell is soft and spongy when pressed; closed-cell is rigid. An independent surveyor can confirm with certainty.
Is open-cell easier to remove?＋
Yes — typically 30–40% cheaper than closed-cell removal.
Does the EPC reflect the foam type?＋
Not reliably — EPCs note insulation but rarely the foam classification.