While tile is unique and very beautiful, it is not a practical system and it doesn’t work well with our Pacific Northwest cocktail of moisture, humidity, and long periods of days with little sunlight. Moss loves it! The appearance of tile declines with age as the UV rays damage or dissolve the top slurry coating. Eventually the concrete becomes visible. This does not occur with colorthru tile but the initial vivid coloring fades to a noticeable dullness. Also, birds, bats, bees, and other critters just love making their home within your very expensive tile roof. See below link for amazing video evidence of this!

Over time, the water channels clog up with debris and sediment accumulates at the bottom of the valleys, which then diverts water where you don’t want water to go.

Tile also is very expensive to maintain and repair. Count on many being broken if anyone is walking on the tile roof for any length of time. I put tile on my other house and regret it.

And, sometimes tile roofs harbor BATS! Watch a video of Bat Infestation on a tile roof in Riverside California, it's Bat-tacular!: http://www.videofantastica.com/view_video/111489/