Old or new signs of water? (big pics)

[Parker]

Stack of pictures to tell the story. This is a bathroom slab. The down pipe is in the centre of a shower. There is a cupboard above that raised section. with a floor board floor in it (ie if I rip up the bottom of that cupboard there would be access to that corroded copper pipe).
The copper pipe is the old inlet to that old water heater.
My assumption is that given the water leak seems to be under that cupboard and not under the shower area, that the copper pipe is/was leaking and that it is the source of the water.

Questions:
Is that water damage still 'current'? It has looked at least roughly the same for the last couple of years since we bought the place, but I'm not sure whether it should dry up and leave no signs of the mold etc or whether it's all now dry and that staining will just be there forever.

Is there anything I should do to the timber that is there?

Any other tips on what I should do here?

Oh, I've just had a thought. I'll go and take a pic soon of the inside of that cupboard to show you the top view. There is no signs of damage or damp there at all that I can see.

[Parker]

Having trouble getting pics in

<img src="http://claimsearch.com.au/house_damage/damage1.jpg">
<img src="http://claimsearch.com.au/house_damage/damage2.jpg">
<img src="http://claimsearch.com.au/house_damage/damage3.jpg">
<img src="http://claimsearch.com.au/house_damage/damage4.jpg">
<img src="http://claimsearch.com.au/house_damage/damage5.jpg">

[SilentButDeadly]

All the hallmarks of a damp slab and some very poor protection of the timber nearby. The timber is stained by a fungal attack from being in contact with the damp slab. When you place was built the timber should not have been allowed to come into contact with the slab.

So what you'll need to do is insert some plastic dampcourse between the the timber and the slab and between the timber and the metal on top of the brick work. Then you'll have to treat the timber to control the fungus.

But what makes you so sure that the shower isn't leaking? If the pipe was leaking then you may see a lot more water than you are.....I'd be wagering that the shower is 'leaking' into the slab and that the slab is moist.

Fix the pipe if it is leaking but I'll wager on the shower itself.....unless of course that cooper pipe runs through the slab. Surely not!!

[Parker]

So what you'll need to do is insert some plastic dampcourse between the the timber and the slab and between the timber and the metal on top of the brick work. Then you'll have to treat the timber to control the fungus.

How would that be done?

But what makes you so sure that the shower isn't leaking?

Only that the slab doesn't have mold growing under the shower, but instead, under the cupboard.

Fix the pipe if it is leaking but I'll wager on the shower itself.....unless of course that cooper pipe runs through the slab. Surely not!!

I'm just organising another pic now. It doesn't look like the pipe is at fault, so I am not sure what I need to do now.