Mystery leak

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Rossington81

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Hi guys can someone please help as I’m pulling my hair out. We’ve got a leak at the top of our ceiling on our landing and it’s appearing in the bathroom as well. The leak comes through when we’ve had heavy rain and forms in a pattern like lines across the ceiling with a dry patch inbetween then another wet patch etc. We’ve had 2 roofers out and both have said the roof is fine and the loft is dry as a bone. We do have Soffit and facias. Can anyone tell me where the water is coming from!!??
 
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Do you have water storage tanks and/or pipes in the loft?
 
Rossington81, good evening.

Have you considered "Condensation" that has /is forming within the loft space?

Have a look in the Forum under the "Floors Stairs, lofts" section.

In there there is a pinned post dealing with attic condensation.
 
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Hi guys, thanks for the replies. I believe it’s a leak but just not sure where from. Could the facia boards be leaking? I’ve been into the attic today while it was raining and there was no sign of any water or anything. No pipes or anything in the area above the leak. I could see daylight towards the bottom of the roof..daft question but could the water be leaking through the gaps an directly into the house??
 
Its not water ingress, the moisture in the room is condensing on the cold spot at the junction between the wall and ceiling at the eaves.
More pronounced by the cold bridges from the rafters.
Insulate, ventilate and reduce the moisture as much as practicle.
 
the regular pattern looks like it could be "shadow condensation" a kind of grinning through where particles are attracted to the coldest areas.
anyway, thats how it was explained to me when we noticed it on interior walls.

edit: just noticed the explanation above
 
How can we resolve this issue? I’ve checked the loft and we have insulation but it doesn’t go right to the end of the loft edges. Sorry if I’m being vague but we only moved in a month ago
 
Rossington81, good evening, again.

As Alastairread above.

Daylight at eaves can indicate vent strips, do NOT block them off! the air flow over the loft is keeping condensation at bay.

What happens is that the insulation between the joists keeps the heat in the house, but, does not stop water vapour passing into the loft, because of the insulation the loft area is cold. The water vapour coming up from below will condense on any cold surface, UNLESS!! there is adequate cross ventilation within the loft areas.

When you were in the loft, where did the glass wool insulation stop? was it well clear of the walls, in effect did the insulation stop where the condensation marks start???

Ken
 
get a couple of chipboard flooring panels up to the loft - lie on them and push the insulation to where you want it.
use a small mirror on a stick to check what you've done.

the "heavy rain" will be changing the temp and humidity in the room and the loft.
 
Hi should the insulation in the loft go right to the end of the roof?? It looks like there’s quite it insulation in the middle or the loft but not around the edges especially above where the patches are coming through
 
Insulate right up to the eaves without blocking them...keep the loft cold and airy to dissipate the condensation entering from the rooms below.
 
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