Open-Cell vs Closed-Cell Spray Foam Removal
Spray foam in UK lofts comes in two main types: open-cell and closed-cell. Both can cover roof timbers and both are fully removable, but the type affects how long removal takes and what it costs. Here's how to tell them apart and what it means for your mortgage, sale, or survey.
The quick difference
Open-cell foam
- Soft, spongy, you can press into it
- Lighter and more flexible
- Applied thicker for the same effect
- Usually quicker to remove
Closed-cell foam
- Hard, dense, and rigid
- Water-resistant and firm
- Bonds tightly to timbers
- Denser, so often slower to remove
Not sure which you have? We confirm the foam type during your free loft survey — there's no need to guess before getting a quote.
Why the foam type matters for removal
- •Time on site — closed-cell is harder and bonds firmly, so it typically takes longer to remove cleanly.
- •Cost — denser foam usually means a higher price per square metre. Open-cell is often quicker and slightly cheaper to remove.
- •Timber care — both types must be removed methodically so rafters are exposed and undamaged for inspection.
- •Ventilation — once foam is removed, your loft needs proper airflow before re-insulating, whatever the original type.
What lenders and surveyors actually care about
In most cases, UK mortgage lenders and RICS surveyors are not focused on whether your foam is open-cell or closed-cell. Their concern is whether the roof timbers can be seen and inspected. Both foam types can hide rafters, which is why removal — with photos and a completion certificate — is the usual route to satisfy a lender or buyer's surveyor.
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We confirm the foam type on a free survey. Get a guide price now — we'll call within 2 hours.
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