What is Closed Cell Spray Foam?
Closed cell spray foam is a rigid, high-density insulation material with exceptional thermal performance. It creates an impermeable barrier with a density around 2 lb/ft³, making it significantly harder than open cell foam.
Quick Identification
- • Hard and rigid to touch (like hard plastic)
- • Usually cream, white, or light grey
- • Cannot be compressed
- • More expensive (£40-50/m² installed)
Why Closed Cell Foam Causes Issues
Complete Timber Concealment
Creates an impermeable seal over all roof timbers, making inspections impossible. Lenders see this as a major risk factor.
Difficult Removal
Its rigid structure makes removal more complex and time-consuming, requiring specialist tools and trained professionals.
Ventilation Concerns
Blocks all roof ventilation, which can lead to condensation issues if the roof space wasn't properly prepared before application.
Higher Removal Costs
Due to its density and adhesion properties, removal costs are typically 50% higher than open cell foam removal.
Closed Cell Removal Costs
*Higher costs due to density and specialist equipment required
Closed Cell Removal Process
Expert Assessment
Specialist survey to determine best removal method
Specialist Equipment
Industrial scrapers and vacuum systems deployed
Careful Extraction
Foam carefully removed to prevent timber damage
Full Inspection
Complete timber survey once foam is cleared
Certification
Comprehensive removal certificate for lenders
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