Rusty/orange water dropping from fascia after dry verge installed

[pandabearrr]

We had the front of our house fitted with dry verge about a month ago, after we had the front rendered in the autumn, to tie everything in a bit and neaten it up. Earlier this week I noticed that there is a rusty coloured water dripping from the fascia board end where the dry verge ends. It's dripping onto the porch overhang and staining the new render...

We didn't have any water dripping problems for the few months where the render was done before the verge caps so I am assuming that something in the installation is now causing water to collect and drip (whilst also collecting something rusty/orange along the way). I noticed today that the caps from the underside start contouring towards the fascia about midway down the left side before then fitting tight to it on the last 3 caps. This isn't the case on the right side where it's more uniform.

What could be the exact cause of this problem and how can it be fixed please? Even if the answer is that verge caps aren't recommended given the flat roof extension then I would rather that than this problem!

Pre-work:

The day after (when I noticed and questioned the exposed screw at the end):

Now:

Photos from underside:

 

[Alastairreid]

The rainwater is running behind the facia after that last dry verge.
It's a very poor finish, the rainwater can be diverted onto the flat roof using a bit of lead under the tile at the bottom of the 3rd verge cap for a quick fix.

 

[pandabearrr]

So the lead in the red circle?

Would an alternative not be to seal up the gaps in the fascia so water cannot get back there?

What would a 'proper job' have done differently to this out of interest?

 

[Alastairreid]

Yes the red circle will divert the majority of the water onto the flat roof.
It's just been badly designed, not a lot of thought went into detailing yhe flat roof when the extension was built. I would have extended the flat roof with a soffit to meet the edge of the tiled roof...otherwise a silly little bit of gutter and downpipe.

 

[Alastairreid]

You could seal it up but the waters still going to run off the edge.

 

[pandabearrr]

Yeah I've thought that just for a design point it looks like a total afterthought (story of a lot of the house) - we only moved in a couple of years ago and this was all done prior. The flat roof only has a few years left in it so when we replace it we will hopefully look to sort the soffit/fascia so it junctions into the pitched roof seamlessly; and at that point we can properly fix all this up neatly too.

In the interim I'll look into getting the lead work done and seal up the gaps in the fascia so any water that does travel there can't get in, collect the dirt/grub and then drip it all down the render.

Can the lead work be done whilst all this is in situ? Is it a small and easy job? Should I look to do something about the gap in the capping here?

Many thanks for your advice, much appreciated.

 

[Alastairreid]

It's a 2 minute job, if you are comfortable going onto the flat roof and sliding a bit of metal under the tile and slope it towards the flat roof.
The capping/ verges really need fitted properly they are all over the place.

 

[^woody^]

Water will always run inside those plastic verge sections, and down the face too. They should normally drain to a gutter or some other method to deal with the internal discharge.

Your contractors have used nails/screws that are not stainless, and/or left some lying around, and the orange colour is rust.

 

[pandabearrr]

Water will always run inside those plastic verge sections, and down the face too. They should normally drain to a gutter or some other method to deal with the internal discharge.

Your contractors have used nails/screws that are not stainless, and/or left some lying around, and the orange colour is rust.

That was my intital though in fact. All these plastic gaps have been here the whole time and aren't new, maybe there has always been water dripping there and because it was clear I had no reason to notice.

So I thought that the exposed screw he's used must be rusting and causing the discolouration (can it really show up and produce this issue in a month?). Then I thought if he's used the same non-stainless screws throughout the capping then is the whole job not going to need re-doing with stainless? Or is the fact that most are covered by the overlapping caps okay?

 

[^woody^]

Nowadays, ferrous screws are mainly thinly plated not glavanised - the coating tends to get worn just by driving the screws in.

Water running off one screw is a risk, but may not produce significant rust staining, but several screws or if water is allowed to collect and then over flow that would be more concentrated with iron.