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[Simon Boyes]

Hi there , I rent out a property  in Hull.  Been having issues with mold in upstairs bedrooms. 

[Nickfromwales]

44 minutes ago, Simon Boyes said:

Hi there , I rent out a property  in Hull.  Been having issues with mold in upstairs bedrooms. 

Most likely due to lack of airflow, not 'ingress'. Mould starts when the walls stay damp because the air stagnates. My mate rang me about his HMO and was about to pay some "damp specialists" to resolve. I told him to fit an open trickle vent and ask the room tenant if they dry their clothes in the room. He bought a communal tumble drier and fitted the vent. Problem solved.

I also told him to get furniture a little way off the walls, as a full height wardrobe up tight to the wall is a damp ( humidity and stagnated air ) trap so mould will thrive there. 

[Simon Boyes]

The wardrobe  is built in . Anyhow I'm have a air vent fitted into wardrobe.  The main problem  is the tennants won't open the windows .

[Mr Punter]

If there is a loft I would suggest a Positive Input Ventilation unit as it will eliminate the mould issues.

[Nickfromwales]

1 hour ago, Simon Boyes said:

The wardrobe  is built in . Anyhow I'm have a air vent fitted into wardrobe.  The main problem  is the tennants won't open the windows .

Put permanently-open trickle vents in the windows. Leave a letter with the tenant stating they must not be found to be closed off / blocked.