hi,

regarding my conservatory. The plaster was drying out nicely until i noticed a big almost water like stain on the wall. It appeared that there were very fine white crystal like white dust around the stain/water mark. What could this be, not the beginnings of mould/damp I hope. There has been alot of condensation since it was erectet. This part of the wall is double with the neighbours wall behind it. We put insulation between the two. Did we put the right type though? it was the ordinary loft insulation the yellow stuff.