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Re: High Profile Concrete Tile Roof
Looks like "Villa Roll" ( "W" ) shaped tile.
The lead flashings on top indicate it is a "System One" roof, except that System One roofs had underlayment under the tile, it just was not sealed to anything anywhere. I've also always seen flashings used under the tile at walls, valleys, etc., which had 'slater's edges' - edges which were bent up and angled back toward the flashing to catch water, with lead flashing used over top of them along walls - such as is shown in that photo where one roof is higher than the other roof.
No roof sheathing is something I've only heard of 'out west' (like in Arizona and New Mexico, some in California), didn't know it was allowed in Texas.
Any, I will repeat that ... *ANY*, broken tile is a "roof leak" as the tile is being used as the waterproof covering.
The lack of sheathing was probably 'designed' like that, however, the roof structure is much weaker with spaced sheathing than if it had plywood or OSB panels for the roof sheathing.
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