1.        TRICKS OF TILE MATCHING: Tile replacement on an existing roof raises the issue of tile matching. The accompanying list of Roof Tile Suppliers contains several companies that maintain large inventories of salvaged roof tile -- and they can be quite helpful in locating matching tiles. If you can't find an exact match, a frequently used trick is to scavenge tiles from the least visible part of the roof -- use these for patching -- and fill in the vacant spot in the inconspicuous roof area with the "near-miss" tiles. Salvaged tiles that match the original tiles can also be a cost-effective solution if you're making an addition to a tile-roofed building, and matching tiles are not currently in production as a standard item. If at all possible, try to avoid getting into custom production of matching clay roof tiles. Manufacturing exact matches of color, shape, and texture in fired-clay roof tiles is as much an art as a science, and is thus a lengthy -- and costly -- process.

2.        REPAIR, DON'T REPLACE: Because installing a new tile roof is labor-intensive, initial cost is high. But when initial costs are amortized over the life expectancy of the roof, a clay tile roof can be very cost-effective. The high value of a tile roof is the primary reason to seek ways to repair -- rather than replace -- if at all possible. REPAIR OPTIONS: If failure of metal flashings is the source of most leaks, it's possible to lift a limited number of tiles, replace all flashings, and re-lay the original tiles. During this process, you may also find some broken or cracked tiles. (An experienced roofer can tell by gentle tapping whether a tile retains its structural integrity, or has hidden fissures.) Cracked or missing tiles should be replaced at this time. Work on an existing tile roof must be done by an experienced roof tile contractor; an inexperienced contractor may break more tiles than he/she replaces.