How Arizona UV and Heat Degrade Unsealed Pavers
Arizona's UV index regularly reaches 11+ (extreme) during summer — among the highest in the continental U.S. UV radiation bleaches pigment from concrete and clay pavers, fading vibrant tones to washed-out, chalky appearances within 1–2 seasons without UV-stable sealer.
Thermal cycling compounds UV damage. Scottsdale pavers reach surface temperatures of 150–180°F in summer, then cool significantly overnight. The constant expansion and contraction creates micro-fractures over time, accelerating wear and creating pathways for water and stain penetration.
Staining and Organic Growth on Unsealed Pavers
Unsealed pavers are porous. Oil drips, leaf tannins, pool chemicals, bird droppings, and food residue from outdoor entertaining all penetrate directly into the paver surface. Once embedded, these stains are difficult or impossible to remove completely.
Organic growth — algae, moss, and lichen — thrives in the porous surface of unsealed pavers, particularly in shaded pool areas and north-facing patios. Biological growth holds moisture against the paver surface and develops root structures that physically degrade the material over years.
The Case for Sealing Before It's Too Late
Pavers that have been unsealed for multiple years and show significant staining or organic growth can be restored — but restoration requires intensive professional cleaning before sealing, adding cost. The earlier pavers are sealed after installation, the better the result.
Blues Home Services always cleans pavers professionally before every sealing project, ensuring complete removal of existing staining and organic growth. Sealing over dirty pavers traps contaminants and leads to premature failure.