A dark roof in direct sun can reach 70°C at the surface on a clear July afternoon — heat that keeps radiating into the loft space long after the sun has gone down. A white or light-coloured roof, treated with a reflective coating, can run 20–25°C cooler on the same day, simply by reflecting the radiation that a dark surface absorbs.
The Mediterranean precedent
Whitewashed roofs and walls are common across the Mediterranean and North Africa for exactly this reason — they’ve been the default response to intense summer sun for centuries, long before insulation standards or mechanical cooling existed. The UK’s building stock rarely uses the principle, mostly because our summers didn’t used to demand it.
What’s changed
Warmer, longer summers have made upstairs bedrooms and loft conversions genuinely uncomfortable in a growing number of UK homes. A reflective roof coating is one of the few upgrades that addresses this directly, without altering the building’s structure, insulation, or appearance from the street (most coatings are applied to flat or low-pitch roofs not visible from ground level).
Is it right for your home?
Reflective coatings work best on flat and low-pitch roofs — extensions, garages, and dormer conversions are the most common candidates. Steep, visible pitched roofs are usually better served by loft insulation and ventilation improvements instead. We’ll tell you honestly which applies during a home assessment, rather than defaulting to whichever we happen to sell.