Paint Bubbling or Blistering

10 Apr 2005
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United Kingdom

Does anyone know what this is ? I got up this morning to this. For background info. The wall was plastered back in April 2013 and then painted. I did use a watered down wet coat as the first coat (white) and then put the colour on.

Is this what damp looks like?

The paint is a Dulux mixed paint - silk from B and Q's mixing stall.
Everywhere else in the room is fine. Just these areas

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With the patches either side and below the window then it's almost certain to be water ingress from the outside sill. Check outside, especially at the corners of the sill. Is it a solid or cavity wall?
The water is likely to be wicking into the wall and those bubbles/blisters are the lowest point at which it stops.
Until the source is rectified then it is pointless doing anything with the wall as it will continue to happen. :(
it could be condensation off the window dripping onto the Interior of the wooden window sill and soaking into the plaster. Its probably a cold spot of the property
What sort of heating is there in this room,?? what is the room used as, is it kept warm ??
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Thanks for the info. The house / wall is a solid wall with pebble rendering on he outdide. The room is a spare bedroom . It has central heating in the room which is on like all the other rooms in the house.

I will double check that the bubble lines are only under the window

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