Installation

The Uniform Building Code stipulates that tiles must be accompanied by installation instructions. In moderate climates, specifications are designed to restrict water intrusion and extend the life of the assembly components. High wind areas specify installation geared to stabilize roof tile during a wind event.

Moisture control is vital in any roofing assembly regardless of the added investment in components, such as underlayment or flashing materials. With any concrete tile, water is directed to runoff on top of the tile and control drainage in pre-formed flashing at critical roof plane junctions under the tile. The system limits extended moisture exposure to the most vulnerable assembly components by providing unrestricted water passage off the roof, while providing airflow under the tile. This allows the air space below the tiles to dissipate heated air, before it gets into the structure and warms the building, thus extending life of the tile.

Maintenance

It is recommended that concrete tile roofs undergo a yearly visual inspection. This can help limit accumulation of leaf debris in the valleys of the tiles or moss growth that could create a damming effect with rain. Moss and algae themselves do not harm concrete tiles, but to prevent them from affecting the aesthetic appearance of the tile, periodic cleaning with a power washer by a professional can remove them. Biocides or zinc strips may also be utilized to slow the growth of these organisms on the tile. After periods of high winds, earthquake, or extensive hail, a visual inspection of the roof should also be made to ensure that there are no cracked, broken, or loose tiles (or their fastening apparatus) in need of replacement.

Brian Libby is a freelance architecture writer living in Portland, Oregon who frequently writes about sustainability.