condensation with fitted wardrobes

[Bamummy]

We have a tiny bedroom that my DD is in, and would like fitted wardrobes to maximise the space. However this room is susceptible to damp caused by condensation, but seems under control if the window is open constantly.

Would it be stupid to put in fitted wardrobes, or is this asking for trouble and make the damp worse? or would the damp collect behind the wardrobe's, as it tends to be worse in the corner which is the corner of the house.

you could line the walls first with rigid foam insulation slabs having an impermeable foil coating. You will find Celotex, Kingspan or Knauf in your local builders merchant or DIY shed, and a foil tape which is used to seal the joints between boards, and possibly an instruction leaflet (if not you can get it from the maker's website). It is better than polystyrene. 25mm is the minimum to consider, if you can use thicker it will cut down heat loss from the room more. The 2400x1200mm sheets are best value and will probably reach near to the ceiling. You must do the entire wall that the wardrobes will cover, with no gaps, as condensation will rush to any cold spots. If you want to do a more permanent job, it is available with a bonded plaster face that you can decorate.

Improved ventilation in the room will reduce condensation. E.g. open all bedroom windows every morning between getting up and making the beds. Avoid draping wet washing inside your home. Use the extractor fan during and after all baths and showers.

p.s.

You can DIY it as described above, or a recommended, local, experienced plasterer will know how to fit it, though he may recommend drylining with foiled plasterboard over the insulation, which is fine and a better pro job. If you're paying for that, have 40mm or 50mm insulation. You will need to have any sockets or switches on the wall extended by an electrician. It is much more work to line a wall that has doors or windows in it because of the reveals.

A thickness of the foam slabs has greater insulating properties than the same thickness of mineral wool, as well as not supporting interstital condensation, so is greatly preferable.