damp patch

[poppie]

have just had a room plastered and we have a damp patch in the middle of a corner wall - one wall is external and the other internal have taken bricks out from outside to check if damp or wet in the cavity and all is dry - the patch will dry out and then return and dosent get any bigger have put a coat of paint on the wall and it sticks ok but stll the patch returns what could it be

[Top_Gooner]

Does the weather affect the appearance of this patch, i.e. does it appear after rainfall, during cold spells etc ?

[Top_Gooner]

Also was the patch evident prior to the replastering, and what kind og plastering was carried out, a single skim over existing plaster or full hack off and two coats (base and finish). If so, was the plaster lightweight gypsum or sand and cement ?

[curlyfilm]

had a similar problem, eventually i worked it out that it was caused by condensation, hope this may help