Replacing Valley Flashings

[mattj]

The previous owners of my house were not that into routine maintenance... cleaning gutters and the like! Consequently one of the Valley flashing is completely shagged and need to be replaced. The roof is cement tiles that are in remarkably good condition. I was in Bunnings the other day, and I think they have the flashing, so I have a couple of questions...

1. Am I allowed do it myself or do I need to get a plumber in?
2. Should I do it myself?
3. The answers to 1 and 2 being yes... where can I find some tips!

Cheers

Matt

[rgcam]

I believe in Victoria you are obliged to use a roof plumber.
I did not. Tips I learned is that you have to remove a lot of tiles so have spares.
second is that if you mortar between the tile and the valley do not use too much mortar.
Regardless of how good you are, water will wick under your mortar in places. That water needs a path to run down and escape at the bottom. If you create a dam anywhere the water will puddle and overflow.
To simplify, you have a valley then the mortar, then another valley under the tiles then the bend up of the valley sheeting. I used an unconventional method, a strip of wood which I glued to the valley with ormonoid and painted it to seal it. Have not had an issue in 5 years so works OK. R.G.