Water leak from gas fire flue

[pandaman]

I have seen a previous post about something similar, not sure if it applies to my problem. I have had a roofer twice to fix a leak around where flue exits the roof. He had a second go as there was still a leak from somewhere. Applied a lot of sealant. The leak was not from inside the flue pipe as you could see it dripping onto the concrete section where pipe goes down to the fireplace in the lounge. I had an old bowl in place to catch the drips. during the rain on Tuesday I went into the loft and noticed there were drops of water in the bowl, I had dried it off previously. Then I noticed drops of water forming on one of the joints on the angled bend in the pipe. The rain must be getting in the flue somewhere. The house is 30 yrs old nearly and we have lived here since it was built. Has anyone any idea where the rain could be getting in?

 

[Wayners]

Impossible to give an answer from a discussion.
Picture would help but still, not really possible to pinpoint leak.
Might be a case of stripping the roof off and looking at felt to trace water stains to where leak is.

 

[pandaman]

Thanks, have had roofers strip around flue pipe as there was a separate leak, they did not cure it and had to come back and applied sealant around all the joins. This leak from flue seems to have started afterwards. Have asked them to come back again, hopefully on Monday, to inspect flue pipe. It seems odd, to me anyway, how the rain can get into the flue, it hadn't leaked in the previous 30 yrs. The photo shows where it leaks from. At the join in the centre of the circle. It gets a drip about every 20-30 seconds. I have an old washing up bowl under to catch it.

 

[CountryFan]

When was the flue last flow tested and did they enter the loft?

 

[pandaman]

It has never been flow tested. Did not know anything about that. Gas fire is not normally used, last tim about 3 yrs ago when boiler packed up, took 3 days to get the part, this was during a run of extremely freezing weather. What does a flow test entail and how could a leak be linked with that?

 

[catlad]

Cap might have blown off.

 

[CountryFan]

What does a flow test entail and how could a leak be linked with that?

It sends an amount of smoke up the chimney/flue being tested, and if it’s failed anywhere then smoke would emanate from the failure.

 

[Laurieo]

Get a gas Safe registered fitter in .Don't use gas fire until its been checked.
Flue may have been disturbed when fixing rood .

 

[Alastairreid]

Looks like Selkirk twinwall you have.
Can't see how you could get a leak from the roof more likely to be combustion gases condensing in the elbow.
I would get the fire serviced..the flue gets tested as part of the service.

 

[Harry Bloomfield]

The rain must be getting in the flue somewhere. The house is 30 yrs old nearly and we have lived here since it was built. Has anyone any idea where the rain could be getting in?

Is there a cap of some sort, on the roof terminal?

 

[pandaman]

Yes it has a cap on. Weird thing is the leak was noticed when rain was coming from west or south west, house faces west front, east back but after the rain this week it has been coming from the east or north east and the flue has not dripped into the bowl under the flue in the loft. Need to wait to see for next westerly rain to see if it leaks again.