Mould on picture frame new build

[Flopsy145]

I've just noticed 2 pictures with some mould on so took them off the wall and the back of the frames are mouldy. They've only been up since early December when we moved in, house was a new build completing August 21. The wall they are on is the one that we are attached by to neighbours, 3rd frame in the row totally fine. It's a bedroom and doesn't get damp or condensation.
Does anyone know what could be causing this and how best to hang the pictures to avoid it happening? I'll buy new frames!

There will still be lots of mposit in the walls of a new build, especially external walls and through the winter. Just let's the wall air a bit before putting them back up. By next year it shouldn't be an issue. Lived in two new builds and had the same. They do usually say not to put anything up on the walls for a year but no one really does that x

Yes, like @Cuddlemuffin says it takes ages and ages for the walls to dry out. In the old days you couldn't paint the walls.

When we bought new build we were told not to paint walls or hang any pictures on the walls for a year as the walls need air to dry out :( We made the mistake of putting lots of cardboard boxes next to a wall in the cupboard under the stairs and they all went totally mouldy as the door was kept shut with no ventilation! Once everything dries out you'll be fine though :)

Thanks all, very helpful 🙂 these new builds hey! Haha.
Do you think putting a thin shelf up and leaning the frames against the wall would be ok as there would be significant gap between frame and wall to allow ventilation?

A gap would help I think but it depends on how the air circulates in the room, and how often the room is heated and aired. A dehumidifier would also help.

@ToastieCrumbs thank you! It's my daughter's bedroom so stays at a good heat and I often open the window, sure it will get more air as the weather warms up too!

Is there also a chance they were slightly damp when you put them up? If you'd given them a quick wipe over with a damp cloth say?

@Calmdown14 my boyfriend seems to think this is the cause but I can't see anyway they would have been damp as I didn't wipe them down, unless someone had just had a shower or something and there was moisture in the air as I was doing it!

Put a big piece of blue tack at the back to hold them away from the wall. Wipe the backs first with bleach though.

Heating will help a lot, but equally if your daughter is in her room a lot sleeping or playing then that’s also moisture being breathed into the air and maybe not being let out. Do you have the window vent open? They make a huge difference.

I would definitely get a small dehumidifier at least. That way you can know the humidity of the room and are not guessing. Better to keep on top of it now. And also watch the backs of wardrobes and chests of drawers if you have them.