Slight mould on new Dot & Dabbed Wall

[Luckyphil]

Hello all

1st visit in here , I’m looking for some advice :-

Unoccupied 2 Bedroom Semi , no central Heating at present
The Property is undergoing a full refurb , with a recently added single storey Extension , this is where a problem has arisen :-

Whilst drying out I’ve noted that in one Corner of the Extension there is shadowing almost a damp type stain with a slight growth on the face of the Plaster , this growth wipes off no problem , there is a small similar area of staining under the Steel Lintel area and at the bottom of the Doir reveals , The Wall is Plasterboard dot & dabbed then skimmed , Walls are Brick / Rockwool Wall Slab / Blockwork

The Extension was built during inclement Weather but was covered up as best as it could be during Construction , there is no new ingress of Water on checking Walls etc

putting a damp Meter on it shows around 20% on the majority of the Walls but around 26-28% in the problem area

I’m questioning will this staining / growth go away as the Walls dry out further , when painted is it likely to break through the Paint finish

is there a primer I can paint the Walls with prior to decoration ?
Any feedback would be appreciated

thanks

Phil

 

[KenGMac]

Luckyphil, good evening.

Suggest you take no drastic action just now but.

When is the property due to be occupied?

Is there a working Central heating system installed? or is it still work in progress? If the system is working suggest you fire it up on a low setting say @ about 35 / 40 C? this will re-introduce heat slowly so as not to cause any issues with a sudden shock from an un-heated space to a space heated to 20 C.

Ken.

 

[Luckyphil]

Hi Ken

it’s still unoccupied at present , there’s back ground Heating kicking in occasionally, the Central Heating is due to go in Mid January & my Step Daughter is purchasing hopefully in March / April , so hopefully things will clear up then ?
Thanks for your reply

Phil

 

[KenGMac]

Luckyphil, good evening, again.

If possible, introduce and increase heat slowly, that way [hopefully] nothing reacts to being cold one day and a lot warmer the next?

Ken.