How?

what's at the other side of the wall?

water is leaking through.

fix the wall from the other side

Yes. Agree with Bro. slimey. There is water seeping into your wall. The paint discoloration and mold growth confirms that. You'll need to find out where the water seepage source is. Fix it, then repaint the wall.

What should i do temporarily?

It would help if you can give more information on the wall. Interior? Exterior? Location ? (bathroom, bedroom, etc) Do you know what is behind the wall (i.e. are there piping? ) The room behind the wall? (bathroom, toilet, outside garden)

The watermark is obvious.

Behind white wall is a bathroom

1. bang wall.
2. fix the leak.
3. if no leak found = add water proof layer
4. seal up the wall.
5. repaint.

It will take some time for workers to come to fix the wall leakage, how should i clean the mold first now?

Water is seeping from behind the wall. Source unknown. Could be the piping, could be water from shower from the bathroom, could be other source. You will have to find out. For the meantime awaiting repair you can wipe down the wall with a wet cloth. The mold comes off easily. Be warn ya, leaks do not go away by itself. You will have to fix it. Else it will grow into a monster problem (electricity trips, damaging foundation, etc). If that wall is on the first floor (i.e. not ground floor) it becomes even more crucial.

The height of the leak starts from the top ... most likely a possibility of a wall shower head connection. Unscrew and roll some white tape to stop the leak.

As for the wall, use water and brush.

The amount of mold suggest piping leak.
Grout leak from tile lines leh..forever that spot bubbling paint but no mold

Pipe leaking, got solution for mold. But temporary la because still leaking.

Tarok wallpaper, one eye close, one eye open. Kautim.

The glue cannot stick to a wet wall.

There is no quick temporary solution.

It is bathroom but what is exactly behind the the wall. Is it a sink or toilet flush?

Toilet flush, shower and water tap

I meant at the most wet spot on the wall. It cannot be all three

Contractor will knock the wall at the most damp location as it is most likely the leak pipe location. Once fixed, will leave it and see it the wall dries up to confirm.

If you notice the picture, the leak starts from above human head when standing.

That would be the first place to check.

Investigate where is the leakage and then repair that first..

If you just repair this side of the wall, it will not be long term.

The higher wet point is not necessarily the starting point. The water absorbed up like osmosis. The most damp location is the likely point. Looking at the tile as scale, the height is about sink or toilet flush location I think.

it could also be pipe fittings for water pipes leaking. this usually happen in older homes and accelerated by high pressure.

Contractor can't fix due to mco, Temporarily stop the pipe water in the bathroom now.

This is the bathroom. Any thought where leaking?

Wow, your toilet so beautiful....but time to hack the tiles..hehe

Look like this after cleaning

Sure or not...

this is mold infestation.. spray bleech or vineger on the wall and let it soak.. do a few times then wash the wall...

leave it few days and repeat if still grow after 1 week.
Permanently solve this by putting new oil based gloss coat.
The oil based paint will not allow water to seep onto the wall..

use anti mold paint.
like weather paint something like that.

You need to show/indicate which is the back wall of the mouldy wall.

check the area behind the marked area.

This pic confirm is pipe leaking behind the wall.

Here

This area is here

how is that part built?

try knock on it.........cement or just some plywood screwed into wall then stick some tiles onto it.

check the top white portion...........any missing grout line?

Those are brick. Very solid. No missing grout line.

eitherway.........the waterproofing behind the thing failed.

Based on the picture...
Seems like water seeping through the wall...
Waterproofing failed big....
Sorry to say.. needed to hack the wall & tiles.. to solve long term...

Unscrew the connector at the water heater and wc inlet and roll some white tape on both sides. Hope it is the source of the leak.



This post has been edited by mini orchard: Jun 1 2021, 06:14 AM

If that is the cause usually can see water seeping down from the bathroom side. If don’t see it then very likely not the cause

This post has been edited by slimey: Jun 1 2021, 08:54 AM

Is the inner end that is attached to the elbow and it leaks inside the wall. If is outer, then yes, can see water mark.

A plumber will also do the same b4 hacking the wall.

This post has been edited by mini orchard: Jun 1 2021, 09:05 AM

tighten all the fitting connections which attached to the wall and monitor first

the inner end leak can still see water seeping down the wall from bathroom side.

One must try all cheaper possibilties b4 hacking the wall.

Leaking is not an easy problem to solve. Sometimes is obvious and can be rectified easily.

If the wall plastering is with bad cement rendering, it will not leak outside the wall.

Is definite internal leaking of the piping connections. Try those can be seen. Those hidden, no choice have to hack.

This post has been edited by mini orchard: Jun 1 2021, 09:46 AM

Don't waste time trying to patch things up. The only permanent solution is to hack open the wall to reveal the root cause of it.

There is no wasting time. To tighten all connections, it less than 10 minutes job. If it works, ts save about 1k and messy work.

Yellow PTFE tape better IMO.
Use the 0.2mm type like this
https://shopee.com.my/-1-PCS-BRAND-TAICO-Wh...7163.7606054192

https://shopee.com.my/VEE-100-PTFE-Thread-S...1847.4449235776

CSM got sell the yellow one pretty cheap at the PJ 225 outlet. This one also can use altho 0.09mm
https://shopee.com.my/12mm-x-0.09mm-x-8m-SE...1900.2727553247

The cheapo white one too thin (usually 0.075mm) and not tough enough to tahan tightening force before ripping

This post has been edited by ceo684: Jun 1 2021, 05:10 PM