InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.
Clay tile roof flashing leaks:
This article describes common leak points in flashing on clay tile roofs.
We explain the conflict between stopgap leak patching using asphalt-based roofing cement and the corrosive effect that leads to additional deterioration of metal roof flashings. This article series explains clay tile roofing types, clay roofing tile inspection, tile roofing diagnosis, & tile roof repair.
On modern clay tile roofs, especially where curved mission style tiles are installed, the flashing material is often custom built of copper, lead coated copper, or hand-made using soft copper; traditional clay tile roofs.
Especially where flashing material needs to rest atop curved clay roofing tiles, factory-built or site-built curved soft-metal flashing or flexible membrane self-adhering membranes are most widely used.
Some contemporary tile roof installations use lead sheets that were easily formed to follow the contour of the clay tiles, but modern flashing products include metal that is pre-formed to match tile shapes.
The flat clay tile roof shown at above left, located in Poughkeepsie, New York, demonstrates traditional copper flashing visible at the intersection of the roof tiles and the dormer face.
Flashing at the dormer sides is not exposed but we expect that conventional step flashing was installed under those tiles, possibly with a counter flashing, also not visible. In an un-finished attic one can often spot the nails that secured the roof flashing to the dormer sheathing and roof deck in these locations.
Our second clay tile roof flashing photo (above right) illustrates copper valley flashing, also on a home in Poughkeepsie, NY. Below the clay tile roof valley has been patched as have two damaged roofing tiles. This is a reasonable stop-gap roof repair but not a durable one.
In fact inspecting several copper-flashed older roofs that were being disassembled for renovations we found compelling evidence of the down-side of blobbing asphalt based roofing cement or flashing compounds on metal roof flashing.
The roof flashing was literally corroded away more extensively wherever it had remained in long-term contact with the flashing cement. So while the patch job stopped the initial leak, it also ultimately corroded away the flashing material.
Our two photos below illustrate leaks at roof-cement patch jobs on a clay tile roof.
The short term reliability of roof cement to fix leaks is illustrated by these photos. Differences in materials and intense thermal movement in a clay tile roof, combined with dry-out and shrinkage in the asphalt roof cement used to patch the tile roof shown at above left meant a history of recurrent leaks in this roof (photo above right).
Try the search box below or CONTACT US by email if you cannot find the answer you need at InspectApedia.
Ask a Question or Search InspectApedia
Use the "Click to Show or Hide FAQs" link just above to see recently-posted questions, comments, replies, try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly.
Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. Tel: (416) 964-9415 1-800-268-7070 Email: firstname.lastname@example.org. The firm provides professional home inspection services & home inspection education & publications. Alan Carson is a past president of ASHI, the American Society of Home Inspectors. Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. Carson Dunlop Associates' provides extensive home inspection education and report writing material.
The Illustrated Home illustrates construction details and building components, a reference for owners & inspectors. Special Offer: For a 5% discount on any number of copies of the Illustrated Home purchased as a single order Enter INSPECTAILL in the order payment page "Promo/Redemption" space.
TECHNICAL REFERENCE GUIDE to manufacturer's model and serial number information for heating and cooling equipment, useful for determining the age of heating boilers, furnaces, water heaters is provided by Carson Dunlop, Associates, Toronto - Carson Dunlop Weldon & Associates Special Offer: Carson Dunlop Associates offers InspectAPedia readers in the U.S.A. a 5% discount on any number of copies of the Technical Reference Guide purchased as a single order. Just enter INSPECTATRG in the order payment page "Promo/Redemption" space.
The Home Reference Book - the Encyclopedia of Homes, Carson Dunlop & Associates, Toronto, Ontario, 25th Ed., 2012, is a bound volume of more than 450 illustrated pages that assist home inspectors and home owners in the inspection and detection of problems on buildings. The text is intended as a reference guide to help building owners operate and maintain their home effectively. Field inspection worksheets are included at the back of the volume.
Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. Enter INSPECTAHRB in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.
Special Offer: Carson Dunlop Associates offers InspectAPedia readers in the U.S.A. a 5% discount on these courses: Enter INSPECTAHITP in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.
The Horizon Software System manages business operations,scheduling, & inspection report writing using Carson Dunlop's knowledge base & color images. The Horizon system runs on always-available cloud-based software for office computers, laptops, tablets, iPad, Android, & other smartphones
Support InspectApedia.com & See Fewer Advertisements
From Google's Contributor website: Contribute a few dollars each month. See fewer ads. The money you contribute helps fund the sites you visit.