The ever popular concrete roof tiles are a construction staple in the southern areas of the country especially in states like Florida and Texas. In order to protect concrete roof tiles from moisture, mold, mildew, efflorescence and weathering you need to seal them.
The initial cost of a tile roof is more expensive than wood shake or asphalt shingles, but over the life span of a tile roof, wood shakes and asphalt shingles will need to be replaced 2-3 times. Because concrete tile lasts longer than most other roofing materials, the increased value of a tile roof normally exceeds any initial "savings" apparent with cheaper roofing materials. Concrete tile also costs less than real slate or clay tiles.
Impregnating, penetrating sealers are a great option to help seal roof tiles and prevent organic growth. They will never yellow or delaminate with UV light exposure and rain water will bead off of them preventing the build up of mold and mildew - even in shaded areas.
One of the best roof tile sealers is the Siloxa-Tek 8500. It is a penetrating concrete sealer designed to treat a variety of applications with an emphasis on hydrophobicity and reduction of water uptake. It dries completely clear with a natural finish that will not change the look or appearance of the susbtrate. Guaranteed to outlast and outperform all other roof tile sealers on the market, the Siloxa-Tek 8500 is the most advanced roof tile sealer ever formulated; designed to prevent the re-growth of mold and mildew. By applying the Siloxa-Tek 8500 it will prevent you from having to pressure wash the roof tiles on a semi-annual to annual basis. An added benefit is salt resistance. If the roof tiles are located in an area exposed to airborne salts, the Siloxa-Tek 8500 is able to effectively prevent chloride ion penetration, keeping the roof tiles free of pitting and cracking.
The Siloxa-Tek 8500 is available in a ready to use or ultra concentrated formulation. The ready to use version will cover up to 125 SF per container; whereas the ultra concentrated version will cover to to 625 SF per container. The ultra concentrated version is mixed with distilled water and a great option for large amounts of square footage.