What's causing this?

[V6Jim2]

Strange staining on gable end of sandstone villa. There are two downstairs gas fires which have flues through this chimney. What might be causing this weird stain?

Help!

Jimmy

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[TheVictorian]

Damp.

 

[V6Jim2]

HaHa! Yup, got that! Any idea how it's getting where it's getting? Gutters are all OK....

Jimmy

 

[^woody^]

No DPC in the stack

 

[freddiemercurystwin]

Via the chimney by the looks, seeing as the chimney looks like its been saturated for years ..... Any cap/cowl on the pot? How's the leadworks or dpc round the chimney etc?

 

[V6Jim2]

Could water be getting into the chimney then soak out under the flashing and the roof slates onto the top of the wall?

 

[catlad]

It looks like the water coming down the chimney gable end is missing the gutter
does the stain not dry out when the fire is on?