What Is Cool Deck? A Complete Guide for Arizona Homeowners
Cool deck (sometimes spelled "Kool Deck" after the original Mortex brand) is a textured coating applied to concrete pool decks that reduces surface temperature. In Arizona, where pool deck surfaces can reach 150 to 175 degrees in direct sun, cool deck has become one of the most popular solutions for making outdoor spaces usable during summer months.
How Cool Deck Works
Cool deck coatings contain reflective pigments and a textured profile that work together to reduce surface temperature. The light color reflects solar energy instead of absorbing it, while the textured surface increases the surface area exposed to air, allowing heat to dissipate faster.
The result is a surface that is typically 20 to 30 degrees cooler than uncoated concrete in the same conditions. On a 110-degree day, that can mean the difference between a 160-degree surface (painful) and a 130-degree surface (warm but tolerable for brief barefoot contact).
What Is Kool Deck?
Kool Deck is a brand name (by Mortex) that became a generic term for cool deck coatings, similar to how "Kleenex" became a generic term for tissues. The original Kool Deck product uses a proprietary acrylic cement formula. Today, multiple manufacturers produce cool deck coatings with similar performance characteristics.
Cool Deck Application Process
- Surface preparation: The existing concrete is pressure washed, repairs are made, and the surface is profiled for adhesion
- Primer: A bonding primer is applied to ensure the coating adheres permanently
- Base coat: The cool deck material is mixed and applied by trowel or spray
- Texture: The surface is textured while still wet to create the characteristic lace or knockdown pattern
- Sealer: After curing, a UV-resistant sealer is applied for protection
How Long Does Cool Deck Last?
In the Tucson climate, a properly applied cool deck coating lasts 5 to 10 years before needing recoating. Factors that affect longevity include:
- Quality of surface preparation (the most important factor)
- Product quality and thickness
- UV exposure (full sun vs. partial shade)
- Foot traffic volume
- Chemical exposure from pool water
- Maintenance and cleaning frequency
Recoating is significantly less expensive than the initial application because the surface preparation is simpler.
Cool Deck Costs
- New application on existing concrete: $4 to $7 per square foot
- Recoating over existing cool deck: $3 to $6 per square foot
- 600 sq ft deck (typical): $2,400 to $4,200 for new application
Cool Deck Maintenance
Cool deck requires regular maintenance to maintain its appearance and performance:
- Pressure wash or scrub 2 to 3 times per year
- Reseal every 2 to 3 years
- Address stains promptly (pool chemicals, leaves, dirt)
- Repair any chips or worn areas before they spread
Is Cool Deck Right for You?
Cool deck is an excellent choice if you have an existing concrete pool deck that gets too hot in summer. It is the most cost-effective way to reduce surface temperature without replacing the entire deck. For new installations, consider comparing cool deck to pavers to determine the best option.
Our cool deck services include both new applications and recoating. Contact us for a free estimate.