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Re: Clay Tile Installation questions
Fritz,
Sounds like you are describing System Two, Three, or Four installations.
System One installations have the flashings on top of the tile and are the worst (and cheapest) installations for tile roofs.
My guess is that you are seeing better installations, maybe even the good 30/90 hot mop systems. That's good. With those, the weatherproof covering is the 30/90 hot mop, the tile is then used to protect the weatherproof system by keeping most of the water off it, by protecting it from sunlight, weathering, debris, etc.
Why they install System One tile roofs is beyond me. The *tile cost* is the same, the *tile installation cost* is the same, all they have done is save a little on the underlayment, which means throwing away all that good tile much sooner. The true cost of a System One installation is greater than a 30/90 hot mop as the replacement cost comes much sooner for a System One (unless you are in an area where it does not rain).
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