I’ve Got Damp Patch On Ceiling But No Leak From Roof? What Else Could Cause It?
2009 June 14
Patch is in corner of upstairs room between external wall & internal dividing wall between houses.
Water runs down external wall, when raining or temperature cold, for about 1.5mtrs starting from patch.
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Sounds like your gutter is blocked.
although you say roof is ok double check all tiles and flashings also check for damaged briks or pointing on outside driving rain may be culprit
i’d say it is a leak in your roof
condensation from humidity, water running inside the wall, leaking plumbing
check the gutter.
It could be coming throught the external wall under the eaves, or it could be humidity from inside the room, the best thing is to get a surveyer out to look at it.
Could be gutters, flashing, plumbing, or improper ventalation and condensation.
Condensation?
Are you sure that you don’t have a leaky roof? Regardless, you need to hop in the attic and check that out. Check your insulation for water in that same area. Water flows down trusses and angled attic bracing and can end up running down walls where it saturates in wall insulation. It sits, gets moldy and stains drywall.
If it is not your roof, then I would check your siding on that exterior wall. Check for exterior penetrations in your siding. Also, I don’t know what kind of siding you have, but if you have older cedar shakes with seams that run together, that could be a problem – if you have stucco, it cracks and can trap water where the wood sheathed gable end intersects with the concrete masonry wall causing water to run inside the wall.
If it is a leak generating that much water, I wouldn’t put much stock in humidity or condensation.
What is the “patch” that you describe? Is that a fix on the outside of the house? If so, I would start there.
Best of luck!
Water ingress or condensation due to lack of ventilation and heating.
Combination of a number of things mayu cause it; high humidity and less air circulation from inside and less insulation causing cold spot where condensation froms.
Either Condensation, leaking pipe (either in lof or in wall cavity or youve got gutter problems
humidity can sometimes cause this,,just keep an eye on it
humidity can sometimes cause this.
Could be sweat. When roofs are repaired quite a few times and roof tiles are placed on top of previous tiles, the internal heat of the roof is effected by external cold.
Similar idea takes place from condensation on glasses or windows.