London's Victorian and Edwardian terraced houses often have spray foam applied to pitched roofs and lofts from the 1990s onward. Over time the foam traps condensation against rafters and brickwork, especially in areas like Islington and Southwark where winter damp lingers. Dry ice blasting uses solid CO2 pellets that sublimate on contact, lifting the foam without introducing extra moisture that could worsen rot in timber joists common to these properties.
The process suits Greater London stock because it leaves no residue that might affect lead flashing or slate roofs found on many period buildings. Crews working from the 80 Haymarket base reach jobs across central and outer boroughs quickly, often arriving before morning traffic builds. Unlike mechanical scraping, the method avoids vibration that can crack aged plaster ceilings below, a frequent concern in converted flats around Camden and Hackney.
Access through small loft hatches in narrow terraces requires compact equipment and careful dust containment. Operators monitor substrate temperature because older masonry can hold cold longer after a damp spell, slowing pellet sublimation and extending dwell time needed for complete removal.
Technician insight
In London the thing that catches most people out with dry ice blasting spray foam removal is how Victorian terraces hold cold and moisture longer than newer builds; a sudden cold snap after rain means the masonry stays damp and the pellets sublimate slower, so we extend dwell time on the rafters around Islington and Hackney.
Hackney Terrace Loft
Homeowner noticed musty smell and ceiling staining after heavy autumn rain. We found closed-cell foam trapping condensation against 1890s rafters. Dry ice blasting cleared the foam without wetting the timber; improved loft vents stopped the damp returning.
How it works
- 1
Site Assessment
Inspect loft or roof space for foam depth, substrate condition, and ventilation paths.
- 2
Protection Setup
Seal off living areas and place drop sheets to contain loosened material during blasting.
- 3
Dry Ice Blasting
Apply CO2 pellets at controlled pressure to lift foam from rafters and insulation cavities.
- 4
Clearance and Ventilation
Remove debris, inspect for hidden moisture, and restore airflow before handover.
Pricing
Cost depends on loft size, foam thickness, and access difficulty in older London terraces.