Closed-Cell Spray Foam Removal
Closed-cell spray foam is the most problematic type installed in UK roofs. It is rigid, dense, bonds tightly to timber and traps moisture — leading to rot. Removal is more involved than open-cell but essential to make the property mortgageable and structurally sound.
How to identify closed-cell foam
- Hard and rigid when tapped
- Higher density (~35–45 kg/m³)
- Often yellow, beige or pale green
- Applied in thinner layers (50–100mm) but multiple coats
- Acts as a vapour barrier
Why closed-cell is the highest risk
Because closed-cell foam is impermeable, any moisture from inside the home that reaches the rafters becomes trapped between the foam and the timber. Over time, this causes fungal decay, woodworm activity and structural weakening — even when no leak exists.
Closed-cell removal cost UK
£60–£110 per m². A typical UK semi-detached costs £3,800–£6,500 to remove. Detached properties commonly run £6,500–£9,500+.
The professional removal method
Specialists use a combination of fine-bladed hand scrapers and oscillating tools (with dust extraction) to release the foam from the timber. Grinders and chemical solvents are never used — they damage the timber and release VOCs.
Frequently Asked Questions
It's not directly hazardous to occupants once cured, but it causes long-term structural damage to roof timbers and prevents mortgages.
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