HI, I HAVE A SLOT EXTENSIONS ATTACHED TO OUR KITCHEN. ITS A CONCRETE ROOF BUT GUESSING THE AGE OF THE BUILDING (1960) IT ISNT INSULATED. THE TOILET PART OF THE EXTENSION IS STARTING TO ATTRACT CONDENSATION AND MOULD ON CEILING, ALL THE OTHER PART OF THE EXTENSION IS OK. IM GUESSING THIS IS BECAUSE OF THE CONCRETE ROOF, IVE HAD THE FLAT CONCRETE ROOF FELTED ON THE OUTSIDE SO I HOPE ITS NOT LEAKING. HOW CAN I STOP THIS CONDENSATION PROBLEM, PLEASE HELP.