MOST COMMON CAUSE OF ROOF LEAKS?

"I guess as long as we're assuming premature failure I agree with what has been said already, though nobody but Vickie mentioned clogging of parts. In some tile systems (among others) that's a huge factor." I've had to take many Ludwicki apart and put them back on for that reason. Corners left on valley shingles causing clogs and leaks. Many valley repairs are a matter of just cutting the corners/tips off. :laugh: :huh: Slate debris in keyways. Channel flashing that's closed instead of leaving an inch open for water flow and/or the tops not clipped catching debris.

Incorrect.

Corrected.

Here's more. Sooooo many dormer sides get closed at the window sill it isn't funny.

I little trimming with the Multi-Master and some more flashing.

Of course w/step-flashing it most-likely wouldn't be an issue.....To reiterate; Your assumption is correct Vickie...Flashing issues are the predominant cause of leaks.

As one who spends the majority of work time on tile leaks, I agree that clogging and damming are real issues with tile. They no doubt take up more of my time correcting them any other cause. But the equivalent of shingle damage, broken tile, is right up there as a cause of leaks. But fixing a broken tile takes far less time than, say, replacing a valley metal and repairing the underlayment below it, a very common repair that I do.

TomB, step flashing is definitely the superior system for sidewalls, then a channel flashing with a counterflashing above the tile to keep debris out and least desirable channel flashing alone. Unfortunately, when manufacturers give roofers the option of picking the sidewall flashings, too often they pick the easiest and cheapest (channel flashing alone).

Another common repair that I see is when the backpan above a chimney or slylight dumps the water to the sidewall channel instead of keeping the water above the tile. This overwhelms the channel and causes it to overflow or clog where it has to dump out over the tile.

As to blame on these type of issues, the workmanship may be perfect so you can't necessarily blame the roofer, the specs may be just as laid out by the installation guide, so the specifier is off the hook. That leaves the manufacturer or the TRI manual as the culprit.

Will a roof leak if its ugly? If it has no granules on it will it still not divert rain? With no granules to protect it, it's still water repellant asphalt or is it water logged paper?

Flashing issues it is.

wywoody....Most all the correct details have been available & previously practiced...It's just that we, (as an industry), continue to take short-cuts out of greed.

Debris accumulation is dramatically reduced or eliminated, if appropriate flashing/counter-flashing & tile placing techniques are practiced.

Not only tile. Up here in the mountains, most shake tear-offs reveal simple 'L'-metal side-walls...No step flashing!,,,Oh, but it's copper!

A lot of places in the west, still use L-metal w/comp at side-walls. it works w/so little rain/snow.

I notice it's A language barrier. You ask, " are you A {fill in trade}" ? The reply is ALWAYS the same. " oh jes I eng goo roofing meng".

I am having problem with the pool pump from last few weeks, also the slab beside the pool is also leaking. I am thinking to call the leak detection and repair company for help , can anyone here suggest some names of such firms.

In-ground pool?

Poor Workmanship! End of story!  :)