BLOSTM Foil Insulation Roll 1m x 10m - Radiator Reflector Panels Review (2026)

The BLOSTM Foil Insulation Roll is a 10-metre multi-purpose thermal barrier composed of aluminium foil and a central bubble layer. While marketed for floors, ceilings, and roofs, its primary strength in the UK market is as a cost-effective radiator reflector. By creating a radiant barrier, it prevents heat from being absorbed and dissipated by the masonry of external walls, which is a common issue in older UK housing stock.

During use, the material is lightweight and incredibly easy to cut with standard household scissors. It performs best when tucked behind radiators; users frequently report a noticeable increase in the speed at which a room 'feels' warm. However, it is thin, so it shouldn't be relied upon as the sole insulation for a loft or significant structural project without supplementary materials.

Realistic savings for a typical UK semi-detached home depend on the number of exterior-wall radiators treated. You may save between £15 and £40 per year on heating bills by reducing the heat transfer through solid or cavity-unfilled walls. It is a marginal gain product—effective in a broader energy-saving strategy, but unlikely to radically slash bills on its own.

Requires no specialist tools; can be fixed with double-sided tape or spray adhesive. Ensure there is at least a small air gap between the foil and the radiator for maximum reflective performance.

Zero. After the initial purchase price, there are no ongoing costs and the material is resistant to moisture and corrosion.