Cool Roof Rating Council, Energy Star and LEED Ratings
Ref = Reflectance Fraction of sun energy reflected by roof (0-100%)
EMI = Emittance Ability of roof surface to radiate (emit) absorbed heat (0-100%)
SRI Solar Reflectance Index Measure incorporating reflectance & emittance into a single value
A.Ref = Aged Reflectance Three year tested (CRCC) or calculated (CEC) value
A.Emi = Aged Emittance Three year tested (Red values indicate tiles after a 3 year testing)
A.SRI = Aged Solar Reflectance Index Measure incorporating aged reflectance & emittance into a single value
CRRC # = Product Listing ID Cool Roof Rating Council Product Identification Number
Replacing Broken Tiles
The Tile Roofing Institute strongly recommends that you contact a professional roofing contractor to repair broken tiles.
When replacing an individual broken tile, break the tile into smaller pieces with a hammer or similar tool. This will minimize disturbance to surrounding tiles. Once the broken tile is removed, clear any remaining fasteners. The underlayment surrounding the broken tile should be sealed, cleaned and patched with roofers mastic at the old penetrations.
For roof slopes over 7:12 that were installed using battens, wedge surrounding tiles upward, apply roof tile adhesive, and slide the new tile into place.
For roof slopes 7:12 and below that were installed in a direct deck installation, nail an approximately 12 x 6 piece of ½ plywood to the deck in position to act as a batten. Next, insert a new tile, or apply mastic to overlapping areas of the new tile and put into place.
Position tiles fastened with adhesive to an adjacent tile. Do not apply adhesive to the interlocking water channel. It must be placed above the headlap to avoid water damming.
Remove any shims used to wedge surrounding tiles during the repair process. Ensure surrounding tiles are replaced and properly fit and seated.
In an effort to avoid the inherent danger associated with walking on a roof, we recommend that only licensed and insured professional contractors traverse roofs. Caution should be exercised to ensure personal safety and prevent damage to roof tiles that may void the warranty. Roof tiles broken by foot traffic should be replaced as soon as possible. The broken tiles may cause problems by allowing water and UV rays to penetrate through to the underlayment and damage it. There are certain methods of traversing the roof that may minimize damage. It is recommended to step at the bottom three inches of the installed tile. This section is supported by the lapped tile beneath it and the weight is then transferred to the deck below.
Keep in mind that activities such as gutter cleaning and holiday light hanging can be accomplished from a ladder rather than walking on a roof. Ladders should be used so as not to damage the roof tile.
Single Color, Subtle Colors and Effects
Eagle Roofing Products uses the best raw materials available to manufacture our concrete roofing tiles. When single color, mono-tone roofs are selected, however, there will be a variation in the hue/color from one tile to another due to the fact that concrete tiles are manufactured from natural raw materials, and natural raw materials will vary in color. We generally recommend that blends or antiques be used to help mask any variations that may be visible. As the roof ages, the variation tends to be less noticeable. However, please note that variations on single, mono-tone colors will be noticed. Care must be taken during the installation process to obtain the desired appearance.
Concrete roof tiles are normally subjected to the worst conditions that nature can offer. The combination of elements that destroy most other roof coverings, however, will not seriously affect the protective properties of roof tile. Over time, the surface of any product left unattended will show signs of aging, and concrete roof tiles are no exception.
Roof tiles are normally colored by either adding pigment into the body of the tile (through color) or by applying concentrated slurry coat of cement-infused pigment to the top surface following extrusion and forming. Slurry-coated tiles are usually selected when high contrast, bright colors are desired while color-through tiles provide a more subtle appearance. Slurry-coated tile can oxidize and turn chalky before gradually wearing down to the concrete base. The through color tile, on the other hand, may experience some surface lightening, but will retain its base color indefinitely. This lightening can be the result of surface erosion that essentially exposes the grains of aggregate.
When our roofing tiles are manufactured, colored cement will be drawn to the surface of the tile, resulting in the initial color shade. This layer is slightly softer than the body of the tile and will typically erode away within the first ten years, depending on the climate. This erosion will expose a larger percentage of the sand and aggregate resulting in an overall lightening of color. After this initial change, future erosion occurs at a dramatically slower pace and will not compromise the functionality of the tile.
Periodic cleaning and resealing can rejuvenate and prolong the surface finish of either type of concrete roof tile.
Efflorescence is a temporary surface condition which is common to all concrete products. The process is caused by the chemical nature of cement. It is superficial and in no way affects the quality, functional properties, or the structural integrity of the tile.
Manufactured cement contains free lime, and when water is added, a series of chemical reactions take place. These reactions are accompanied by the release of calcium hydroxide that can form a white chalky crystalline salt deposit on the tile surface when reacting with carbon dioxide. This reaction can appear as an overall chalky white bloom (a softening of color) in more concentrated patches. It is difficult to predict how long the effects of efflorescence will last as it depends on the type and amount of deposit, as well as on local weather conditions. The action of carbon dioxide and rainwater will gradually remove the deposit, in most cases, leaving the original color of the roof intact without further efflorescence occurring.
Resealing Your Tile Roof
If you dont choose to change the color of your concrete roof tile, but desire to coat the surface of your tile with a new coat of clear sealer, we recommend the use of 100% clear acrylic sealer after the pressure cleaning is performed.
Re-coating Your Tile Roof
If you choose to hire a qualified, licensed and insured contractor to apply a new coating to the tile, it is recommended that that the roof be thoroughly cleaned. Upon cleaning, the use of a clear alkyd primer is recommended to help ensure an acceptable bond between the new coating and the surface of the tile. Follow the manufacturers recommendations for application and curing.
The e-coating of concrete tile roofs is not required; however it is done from time to time, especially during remodeling. The surface should be coated with a good quality 100% acrylic paint after the pressure cleaning and priming are completed and dried.
Cleaning Your Tile Roof
If desired, we strongly recommend that a licensed and insured professional roofing contractor or cleaning company be used to clean, paint or re-seal your roof.
The following method is recommended to properly pressure clean the surface of your roof to remove dirt, algae or mildew. Alternate methods may be required depending on whether your roof tile is surface coated or through-color.
- In most applications, a pressure cleaner set at a maximum of 1200 psi should be used.
- The tip of the nozzle on the pressure cleaner should be kept approximately 12 to 24 inches from the surface of the tile.
- Limiting the pressure and maintaining a safe distance from the surface of the tile is intended to prevent damaging the surface.
- The addition of a mildew inhibiting solution should be limited to a 90% water, 10% solution ratio.
Mildew, Algae and Moss
Many of the regions where roof tile is prevalent are susceptible to mildew and/or algae growth due the prevailing environmental conditions. Mildew is not analogous to concrete roofing products as it can also form on any exterior surface including stucco, siding and driveways.
Mildew and algae do not grow directly on the roof tile. The amassing of dust and other organic materials that may settle on the surface of tile facilitates growth. When moisture and sunlight are present, spores will begin to grow. Many variables play a role in the growth of mildew, algae and moss such as the location of the structure, exposure to the sun, exposure to dew, surrounding trees and bodies of water. Environmental factors such as wind, changes in rain patterns and even animal activity will contribute to the accumulation of algae on a roof.
Mildew and algae growth can occur at any time during the life of the roof, and many factors will contribute to its presence, or reemergence on a previously cleaned roof. Man-made factors, including grading and excavation, tree trimming, CO2 emissions and even gutter cleaning can and will foster an environment where spores are released; promoting mildew and algae growth.
Roof tile manufacturers have no control over mildew or algae growth, but it can be easily removed or treated without compromising the integrity of the concrete tile. See recommendations for cleaning your tile roof in the section above.