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Roofing/S Tile Roof Leaking

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Question
Roof close-up
Roof close-up  

Roof wider shot
Roof wider shot  
It's amazing the roof has held back water for as long as it has. But this year it gave way and if you look at the picture you'll see why. From inside it looks to me like the leak starts where the S tiles end. Can you give any advice for how to try to fix this myself? The second column of tiles seems to pinch in toward the left and perhaps that's why the roof guy didn't just put in more S-Tiles. Was that a mistake by the roofer?
And in the end perhaps I just need to give up and call the pros. But I'd like to give a temporary repair a shot to get through the rainy season.
Any advice appreciated.

Answer
Mike,

The roof tile is a one-piece clay.  The irregular appearance would indication areas have been removed to likely make repairs.  Tile was not laid well and spaced too tightly, hence leave cannot drain from roof during rains. There should be some open "flat" space between the tops of the tiles.  As old as it appears, it is likely the underlayment beneath the tile is worn out.  Clay roof tile is not a waterproofing assembly, it sheds water so some water will always get under the tile.

Could you take up the six or seven rows from the wall and put new underlayment but if it is as brittle as I suspect you would just be chasing leaks time and again.  You could have old tile saved and new underlayment installed then have tile re-laid, which could save a few dollars, but tile you clean them, cost could be a near equal.  if you have new underlayment installed, go the extra mile and have a 2-ply underlayment installed, a little more money but well worth it.

I wish you the best of luck and write back if you have more questions.

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Steven C. Wadding RRC,RRO,CDT

Expertise

General questions in regards to most roof types and situations. As the Technical Services Manager for Polyglass USA, Inc. this would not be a forum to address any issues directly related to a product my employer manufacturers.

Experience

I have been active in the roofing and waterproofing industries for more than 30 years with extensive experience from product installation, product development and consulting. I have been active in the Construction Specifications Institute and Roof Consultants Institute for approximately 20 years. I am a member of ASTM and am a voting member of various subcommittees. I have many years of consulting experience in the fields of Roofing, Waterproofing and Exterior Building Envelope disciplines.

Organizations
Roof Consultants Institute Construction Specifications Institute ASTM

Publications
Division 7 Technical Binders for Malarkey Roofing Products and Polyglass USA, Inc. CSI Phoenix Chapter Cactus Comments

Education/Credentials
Registered Roof Consultant - Roof Consultants Institute Registered Roof Observer - Roof Consultants Institute Certifified Document Technologist - Construction Specifications Institute Spray Fireproofing Special Inspector - International Code Council

Awards and Honors
Registered Roof Consultant - Roof Consultants Institute Registered Roof Observer - Roof Consultants Institute Certifified Document Technologist - Construction Specifications Institute Spray Fireproofing Special Inspector - International Code Council

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