Hi, I am part way through converting a single storey, single brick shed that is attached to my house. I have created a 50mm thick internal cavity lined with 12mm plaster board, and installed foil coverd bubble wrap in between the brick and plaster board as an additional method of insulation. I have yet to finish plastering the plasterboard. However, I have recently discovered that condensation is forming on the inside surface of the bubble wrap, to such an extent that water is running down the foil and seeping into the room below the plaster board. (I was able to remove an electrical socket to see inside the cavity). My questions are: Will I be able to stop the passage of water through the plaster board once it has been painted? and if so will I end up permanently trapping water within the cavity?
Is there anything I should consider doing to remove the formation of condensation within the cavity? :?