Can anyone help identity cause of mould

[Prbmoran]

Please can anybody help to identify what caused the mould behind these tiles View media item 15293View media item 15294

 

[Dumbo]

Vertical line water getting through grout . Bottom mould faulty seal between tray and tiles resulting in a capillary action of water tracking upwards behind tile . Would be my guess .

 

[Blunt Tool]

That's your answer

 

[Prbmoran]

Thank you for the reply do you think the wall needs to be replaced if so what with thanks for the advice

 

[Flintstone]

What are you wanting to put on the wall now ?

 

[Prbmoran]

re tile it with 600 x 300 porceline

 

[Flintstone]

Your 600x300 porcelain will be too heavy to tile onto plaster anyway so you will need to replace or overboard any plastered walls

 

[Bond]

Vertical stain looks like the source of moisture, horizontal staining from trapped moisture behind the tile. Me thinks.

 

[Prbmoran]

Thanks for all your replies the board that is there has a top papery layer that is peeling with the moisture is that part of the plaster board

 

[NZ_Tiler]

Black is mould but the orange looks more like rust to me.

Could be an angle or screws/nails rusting.

As above you'll need a stronger substrate for a tile that size, and waterproof it...