Bedroom wall mould - stone cottage

[DoingItOnesSelf]

Hi all,

Another issue with our 19th century coach house - Bedroom mould.

We’re having quite significant building work done in the other end of the house so I'm hoping to do smaller jobs like this myself to keep costs down.

Any advice much appreciated. Info below:
- the room is on the ground floor (the house is upside down)
- windows don’t have trickle vents
- wall with mould is solid stone
- 2 of the other walls are stone but have plaster board over and the 4th is a stud. None of these have mould

For context, we hope to rent this house out in the future 5-7 years time so any work we do needs to be compliant with any regs that will be required for a rental.

As I understand, this is probably just dot and dab insulation. The difficult part is that the wall around the windows are curved which will add an extra level of difficultly when insulating the walls with insulated plaster board having to box them off ( can I just chip out some of the wall and install a wooden frame? )

Any advice of the wall insulation and secondly the window issue would be appreciated.

Thanks!

 

[RonnieE]

Hi there

This is likely a condensation issue leading to mould. You can see on that first picture the amount of water / moisture trickling down.

Without getting too technical - water exists as a solid (ice), liquid (water) and gas (vapour in the air). For vapour in the air (humidity) to become a liquid again will depend on the relative humidity and the surface temperature of the wall - especially an issue in older properties in colder months.

It is likely that the wall temperature is at or below 'dew point' - the temperature at which gas / vapour returns to liquid.

This is likely a case of either reducing the humidity levels or stopping the walls being so cold (or both).

There is a useful guide here - https://waterleak.co.uk/help-tips/mould-on-walls-stop/ with more information.

Thank you and good luck.