Mold on plasterboard - can it be cleaned, or MUST it be replaced?

[CmdrBond]

We're having our kitchen redone, and we're removing the polystyrene tiles from the ceiling.

Some of them were coming away anyway.

There are a couple of small patches of mold.

This is where we'd had a leak in the bathroom above, I believe.

The plasterboard feels/sounds solid, and doesn't look damp.

Can the mold be scraped off the surface? Might it go all the way through?

I will likely paint the ceiling of no other work bar cleaning is required.

Images with and without flash.

 

[Harry Bloomfield]

A kitchen, is the worst possible/most dangerous place to have those tiles. Regarding the mold, I would try scrubbing it off, letting it dry, then painting it at arms length away from you, with dilute bleach. Leave it to dry and see if returns after a few weeks. It might be simply due to poor air circulation, and trapped moisture, behind the tile.

 

[CmdrBond]

A kitchen, is the worst possible/most dangerous place to have those tiles. Regarding the mold, I would try scrubbing it off, letting it dry, then painting it at arms length away from you, with dilute bleach. Leave it to dry and see if returns after a few weeks. It might be simply due to poor air circulation, and trapped moisture, behind the tile.

Definitely trapped moisture, as I said, there was a leak from the bathroom above (now fixed).

And yes, I don't particularly like these tiles, which is why I'm taking this opportunity to remove them.

 

[foxhole]

Mould is only surface, just clean and paint.

 

[CmdrBond]

Mould is only surface, just clean and paint.

Great.

 

[jj4091]

If you just paint the stain left behind with emulsion it will come through again, give it a coat of gloss paint before the emulsion.

 

[ktuludays]

Clean with bleach, allow it to dry. Sugar soap and allow to dry, use a few coats of stain stop and then paint with emulsion.