There is a leak somewhere at the toilet.
Contractor 1 - inject pu from above (ie tiled floor)
Contractor 2 - inject pu from below (ie neighbour ceiling below)

Which is the better way ?

from the source aka from above.

Guys,

I have been facing this car pouch leaking issue near the beam. Currently the issue have been "rectified" by developer sub contractor under warranty. However, after PU injection still have water leakage stain as per photos below. Not sure is it water or the PU injection leaked out and touched plaster ceiling that causes yellowish



Any kind input would be much appreciated.

Thank you

What type of roof above the car porch?
Also, does the position of the water mark coincide with the water drainage of the roof for the upper floor?

Concrete slab.

Suspect the leakage leaked down from the beam. Unfortunately the water mark does not coincide with water drainage of the roof

i suspect they PU injection the wrong place.

for concrete slab roof need to make sure :
1. level.......make sure there is declining level towards the drainage. no pooling of water.
2. water proofing. can paint with elastomeric paint(got various brand like nippon, pye, sika etc etc) after making sure the level is done properly. as usual, paint from above aka the source of water.
3. make sure the edges(where 2 section of concrete meet like a horizontal slab with a vertical wall for example) are properly waterproofed as these are the usual places where waterproofing failed.

This post has been edited by slimey: Oct 28 2018, 06:15 PM

Any recommendation for the contractor? Maybe I can engage a proper one to resolve my problem

Try getting access to a contractor with a thermal imaging camera like a Flir mr176 or a fluke so you can see exactly where the water leak is from.

I've been watching a few YouTube videos on how those equipment are used but have no idea if anyone here has actual experience using one and making sense of the images. So maybe try asking around.

If you goggle Flir thermal camera you can find a rental company so maybe see if they provide a service(maybe a building inspector) to detect the leak/provide a report before then engage a contractor do the pressure injection repair.

This post has been edited by Richard: Oct 28 2018, 10:40 PM

No recommendation. I would diy it anyway

Normally it is done from below.
Reason:
As from below, the source of crack that lead to leaking can be found via the water dripping point, whereby PU can be injected from there and let the PU find its way to fill up the crack during pressuring.

If from above, then it is difficult to find the source of leak, so no way to start for the PU injection.

this. one time i see liao i know they injected at wrong place

should have injected it on the beam near the slab (topmost) or on the slab nearest to the beam

what i see is they inject in the MIDDLE of the beam, which does nothing

LOL... the thermal camera is very very expensive

and you cant see where the leak is from because the temperature difference between the liquid and concrete is very minimal if there is any

what you need is a moisture meter and u can check the "wettest" part of the beam / slab / column , which you can assume is the entry point of the water leakage

May have weaken the beam lol

You mean weaken the beam by injecting the middle or topmost?

Apparently the leaking after PU Injection has become worst. Water has been dripping down onto floor.



Any good contractors can recommend to fix this issue? Afraid by the time contractor from developer come is too late

I had pm you the contractor which I engage previously to solve my bathroom leaking.

Thanks for the contacts.

Guys heard of torch membrane water proofing?

yes, expensive and only suitable for large exposed area like flat roof or balcony

plus this one u need to make sure u do it properly the first time since its pretty difficult to find the leaking point after u install the membrane

Yes aiming to do at roof. However developer most likely wont opt for this

My boss project we are using this application to do. However the mixture of the concrete also had waterproofing capabilities.


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