Water staining around chimneys

datarebal said:
not plain tiles fwiw
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I couldn't make my mind up (fully) as the different photo angles belied the gauge. However, in one photo, there was no way the gauge was 100mm or less.
The last piccy on the opening post is alarming. For the wetness to be that low down, there has to be a guttering issue or pipe leak.
 
I'd say possibly a gutter issue as well. Lot of water coming down the centre of the roof, hitting the back of the stack and coming round both sides into the end of the gutters. Best time to check is when it's hammering down. Deep flow gutters might fix the issue.
 
I'm not sure the trays are causing all that staining under the soffits. There's a lot of staining on the stack coming out of the weep holes over the top tray. This is probably partly due to not using patination oil on the tray, but shows that the tray is stopping the moisture going down the stack into the loft.
 
stuart45 said:
This is probably partly due to not using patination oil
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The staining is due to the trays working. have you or anyone checked the lower tray within the roof space?

I have seen similar before , the higher up efflorescence you will be stuck with
 
I'd take 6' off that stack if you are only using it for a gas fire. Those bricks look a poor choice for a chimney that big. I would look at the side flashings also. I would also clean it and paint it with storm dry when the weather is better.
 
datarebal said:
The staining is due to the trays working. have you or anyone checked the lower tray within the roof space?

I have seen similar before , the higher up efflorescence you will be stuck with
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I've said in my post that the staining on the stack shows that the tray is working, but I've always used patination oil on the trays when building a stack, as it helps avoid some of the stains.
I haven't checked in the roof space myself, I'm only looking at the photos like you.
I'd still say the odds are that the staining under the soffits on the walls are gutter problems, rather than the trays.
 
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