What is causing this?

kboc

What do you think?

What would stop it happening again?

Thanks

DOCARCH

Looks like rust. Must be some (non stainless/galvanised) steel fixings/screws used to fix that cladding...or...the cladding itself. What is the cladding around the windows?

Safehands

kboc wrote: »

What do you think?

What would stop it happening again?

Thanks

I agree that rust is the most likely candidate. You might also look at any mastic there is around the area. Some of them can cause staining.

BryanF

We need a close up and ideally the construction detail.
My first thought is to fit a cill/ lip / flashing up under the window cladding that would extend out about an inch with a drip in it.

kboc

the cladding is lead. There is one or two non galvanised nails hanging about thanks to the great tradesman who done it!

the picture looses its detail when I try a close up, but it is certainly appears when there is lots of rain.

This has only started this past 2 or 3 winters. Previous to that it never appearred. I wonder is it anything to do with the fact that i lathered on that oil stuff which stops white stuff (lime i presume) seeping out from block work (usually chimney block work) onto the roof slates? The oil may have worn off by now?

I want to paint the house in summer, but not if it does this again next October.

Thanks

Safehands

kboc wrote: »

the cladding is lead. There is one or two non galvanised nails hanging about thanks to the great tradesman who done it!

the picture looses its detail when I try a close up, but it is certainly appears when there is lots of rain.

This has only started this past 2 or 3 winters. Previous to that it never appearred. I wonder is it anything to do with the fact that i lathered on that oil stuff which stops white stuff (lime i presume) seeping out from block work (usually chimney block work) onto the roof slates? The oil may have worn off by now?

I want to paint the house in summer, but not if it does this again next October.

Thanks

Are those non galvanised nails rusty?

Calahonda52

What's the gutter detail?
Is water getting in behind the cladding at the roof level ?

kboc

Gutter detail is fine, it is well down from the roof felt etc and the actual gutter is good and deep and I clean it regulalrly.

I suspects it is a non galv nail, as that would tally with the gangster who put the lead on.

Thanks

Poor Uncle Tom

The non galvanised nails would be the most likely cause. A fresh coat of patination oil wouldn't go astray on the lead, it stops/slows oxidisation.

As referred to above, if there was a drip/lip to throw off the surface run water instead of onto the wall directly it could stop the direct locational staining.

BorneTobyWilde

Just need to add a drip piece to solve it running down the walls if that
is the only issue.

fozz10

its almost certainly rust. if u want a quick fix put some bleach with water in a spray bottle at 2/1 and spray it on it. should dissapear in a few days