Hi Guys, ask me anything of Water leaking / Waterproofing. The more complicated the question is, the better.

Just ask me everything and i will try my best to answer when i have time.

The more challenge the water leaking waterproofing situation is, the more adrenaline i get Especially those who appointed few contractors to solve waterproofing water leaking problems and yet still failed to rectify the water leaking waterproofing.

Those common water leaking i can share about are below:
1. Waterproofing Problem / Waterproofing Materials
2. Water leaking / Plumbing (toilet, roof slab, wall concrete slab)
3. Concrete crack repair solution.

In general, There are few types of waterproofing chemical
1. Liquid applied PU waterproofing membrane
2. Cementitious waterproofing coating
3. Chemical injection waterproofing system
4. Exposed waterproofing system
5. Self adhesive waterproofing system

I believe Water leaking or Waterproofing problem is the most nightmare defects rectification work compare other defects. Worse still some contractors proposed wrong method solving the leaking matter or some contractor disappear after owner engage their service and many nightmare stories that i heard.

I will be very glad to share some of my experiences rectifying water leaking problems or waterproofing problems and share my knowledge the best solution to rectify it

First of all, apologize for my English and please focus on my knowledge sharing here

I will show more picture example soon

This post has been edited by moonhowler: Aug 2 2017, 06:52 PM

Hi sir,

Appreciate your explanations. Would like to ask regarding first floor toilet floor leaking (terrace). What waterproof material shall be suitable to treat the toilet floor without much hassle or hacking?

Tq

what is the cheapest waterproofing way for a small bathroom

5. Self adhesive waterproofing system

=can diy?

how about toilet waterproofing. i know that if hire a contractor do, they will take out the existing tiles and redo the water proofing. is there any way we can DIY and without taking off the existing tiles.?

hi everyone, thanks for dropping your questions regarding water leaking or waterproofing problems.

To solve the leaking 1st floor (terrace), usually there are two methods to rectify it

Method 1. Hack the entire floor and redo everything[SIZE=7]
To hack the entire tiles,
To hack the existing cement sand screed,
To hack the existing waterproofing materials until the concrete base.

Once removed everything, Redo everything. Start with

Supply and apply with new waterproofing materials (Cementitious type),
Supply and apply cement sand screed (gradient/slope surface - gravity high level to low level to allow water flow)
Supply and install new tiles

Above method 1 is always the best solution. However required alot of time and the most expensive method. This method can be use if the water leaking area is too severe or too "complicated scenario"
"Complicated scenario like
I) concrete profiles full of crackline or full of porosity
II) the existing waterproofing embedded failed miserably
III) contractor forgot/never apply waterproofing membrane at all

Method 2. To inject chemical PU injection to permanently stop the leaking at that particular area only
Firstly Determine and analyze the leaking area
Then Inject Chemical PU grouting to stop the water leaking area. This PU grouting once react with water will expand form a tight, impermeable, elastomeric seal and permanently stop the water leaking at "that particular area only"

Above method 2 do not required those hassle or hacking. Very straight forward rectify the water leaking.

I will update more pictures to explain in more details. Currently busy

Is your small bathroom completely new? The entire floor is "naked'? If so get those "cementitious Waterproofing type will do. Cementitious Type waterproofing is the cheapest among other membrane type (Polyurethene PU, Torch On membrane, Acrylic Polymer etc...) Internal areas can be apply with cementitious waterproofing membrane because internal areas do not exposed the sun and rain.

Exposed area to sun and rain must not apply with cementitious type waterproofing. The reason is over the long period expand and contraction will easily damage the brittle type cementitious waterproofing.

I assuming your self adhesive waterproofing DIY type is pour on the tiles flooring surface and allow it penetrate into the concrete pore? This DIY type depending on the tiles and concrete profile surface. If the concrete profiles surface full of severe crackline / very porosity or the existing waterproofing embedded inside the concrete poorly apply. This self adhesive DIY won't be effective.

This DIY might work if the leaking is very minor and concrete profiles surface is not severe.

My definition of self adhesive waterproofing type is those apply at large scale project spec by architect. Its not very popular type of waterproofing

I think those DIY type is less effective to counter water leaking unless the situation leaking area is very minor. There is another method solving the water leaking without hacking existing tiles and redo the waterproofing which is inject PU grouting. Inject PU grouting is pretty complicated and one must be experienced and skillful to inspect the leaking area to made the best decision. This PU grouting is the most popular method and widely use by the developer and contractor when newly move in house owner complaint their unit is leaking.

I will upload more picture as examples. Hopefully tonight when i am free

This post has been edited by moonhowler: Aug 2 2017, 06:55 PM

reserve

This post has been edited by moonhowler: Aug 2 2017, 05:59 PM

reserve

This post has been edited by moonhowler: Aug 2 2017, 06:09 PM

Any good brand of cementitious type waterproofing u can recommend?

moonhowler When we are not sure where the actual leak is wouldnt it better to find the source by injecting a colored dye to figure out the source of the pipe thats damaged?

Say for example, the end flow is at the front porch; where the water is dripping.

We suspect its coming from the top floor bathroom, but there are couple of piping from the main that goes into the bathroom.

By injecting one by one with diff color, we could determine which pipe is the culprit.

Very good question VeeJay, Its always good to do initial investigation / inspection if the leaking condition is too complicated and to determine which area toilet leaking. We call this ponding test

And for your case, the problem should be Waterproofing issue if the leaking occasionally drip. Usually if the water dripping day and night with constant dripping speed, most likely its due to piping.


There are many brands of cementitious type waterproofing in the market. And most of them does work well as long you follow the manufacturer guides instruction. And contractor must have some basic knowledge how to apply. I will soon come out with some technical drawing details waterproofing.

Popular Brands Waterproofing in Malaysia Market for tendering contract project
1. Sika, Mapei, Penten, Estop, Fosroc, Xypex, Greenseal, Greencemt, Bostik, Daco, Axel Chemil, STO, Oriental Yu Hong (upcoming china brand)

Some of the brands above you can't find in any hardware store and can only get at their manufacturer plant. You can get very good discount with bulk quantity. Some of them only focus supply to big development project contract only.

The new waterproofing brand Oriental Yu Hong is the cheapest and have bigger coverage. A close friend of mine is dealing directly with the manufacturer. The sample quality is unbelievably good.

Example of technical drawing details submit for architect or consultant for approval



This post has been edited by moonhowler: Aug 3 2017, 03:35 PM

Yup Water ponding is other method, but its more for flooring, as for piping I was referring to Dye testing. Wonder why its not common in Msia?

https://www.pollardwater.com/pages_product/dyesdata.asp

you are doing waterproofing work for house?

good discussion. i am bookmarking this thread

Moonhowler,

I chance upon this thread, and hopefully u can help me out.

I'm currently extending my backyard yard to a wet kitchen, and the current progress is say bout 70% done. Roof tiles are the large cement(or clay) corrugated kind, and ceiling are plaster ceiling. There isn't any insulation in between.

The issue is we found moisture/condensation spots on plaster ceiling joints on a few spots, and we thought it was due to roof leak. Efforts has been done to seal the roof even more, with bitumen tape i think, hopefully will stop the issue.

However, since laying the wet ground cement (prep for tiling) yesterday, this morning i found the condensation was more severe on the ceilings, especially the usual spots..and i found out it might be a condensation issue instead of roof leak, when i wipe the inner windows and its all damped. Usually I close off that area during the evening and night, so no ventilation movement, and i can feel its very humid with heavy masonry smell.

Now, i am leaning towards this might be a condensation issue due to the wet masonry works that's not all dry out, and bad airing practice i have been doing at this phase.

Does anyone faced this kind of issue before, and hopefully can enlightened me, as me and my contractor are still puzzled. My contractor is those China-man self employed kind, so i suspected he isn't well versed on this condensation matter as well.

Next phase I will try hoisting the new roof with pipe water to chk if any leakage from roof, so i can rule out the roof.

Its a nightmare for me at the moment, not knowing what shit is gonna come down the road due to this water/leakage/ condensation issue.

Instead of hacking, what about epoxy waterproofing flake coating option?
Any pros and cons?

it's concrete curing process - they release heat which causes the condensation

pus some fans to dry out the place during these 2 days (weekend) and see any difference on monday or not before continue work

damp rising from ground floor slab shouldnt be obvious at this stage and will not cause water droplets to appear on the soffit or ceiling board

malaysia standard doesnt have dye test method (IIRC) but it does have pressure leak test, whereby a sealed piping system must hold its pressure (with some acceptable drop) within 24hr period

Concrete curing "Hydration" is a chemical process which consumes water not produce it..

Quote
Combining water with a cementitious material forms a cement paste by the process of hydration. The cement paste glues the aggregate together, fills voids within it, and makes it flow more freely.[26]
As stated by Abrams' law, a lower water-to-cement ratio yields a stronger, more durable concrete, whereas more water gives a freer-flowing concrete with a higher slump.[27] Impure water used to make concrete can cause problems when setting or in causing premature failure of the structure.[28]
Hydration involves many different reactions, often occurring at the same time. As the reactions proceed, the products of the cement hydration process gradually bond together the individual sand and gravel particles and other components of the concrete to form a solid mass.[29]

Heat doesn't produce water condensation.. Cool does..

i may have been a bit rusty with my concrete knowledge

erm... an easy analogy

put a plate on top of a glass of hot water (like u said, curing concrete release heat)

you will see condensate droplets on the bottom of the plate (the 1st floor slab soffit)

i know it's a bad analogy, but i am also interested in the source of the water droplets on the soffit.

More like how rain clouds are formed?

same principle.. remove the heat from steam you will get water..

Water condensation always forms on cool ambient.. also known as dew point..

Haha! Thanks! I will update more pictures of waterproofing soon. Recently i was completely away from computer.


Can do some initial investigation first if not sure. Any raining that particular day?

To check whether its condensation or leaking at the plaster ceiling. Maybe you can ask the contractor to cut that area of moisture / condensation spots on plaster ceiling and allow few days to monitor any minor leaking?

If condensation, just install exhaust fan could easily get rid of the bad ventilation humid air.

Good question about this method

This method is suitable if the tiles bonding with the concrete surface is still solid intact. Because this application method is applying on top of the floor tiles surface.

Those floor tiles with alot of hollow sounds (when you knock the tiles), eventually will come off in the future. The hollow sounds happen because the bonding between the floor tiles and concrete surface is no longer intact. The epoxy waterproofing flake which applying on top of the floor tiles will come off together too. Leaking occurred.

Epoxy flake waterproofing final layer is apply with a transparent liquid chemical call Epoxy. This final layer might be slippery to some people and there are few cases ppl fall down. This is better to avoid if you have old man might using that toilet shower area.

Another bad thing is if you have very nice color expensive floor tiles, this epoxy flake waterpoofing will apply on top of it and you wont able see that beautiful expensive floor tiles anymore.

Pros
This method work if the tiles flooring still strongly intact with the concrete surface. No hollow sound at all.
You can have them create few design pattern.
If you have a bad looking tiles, this epoxy flake waterproofing will cover it and makes it better looking

Recently i found a contractor using another more or less similar method like Epoxy flake waterproofing but without apply epoxy final layer. I will try ask him more details his method and some photos to update here. The finishing pretty nice too.

Thanks for your informative reply. Any other method that can make it less slippery?

Search in facebook... JS STAR CONSTRUCTION SERVICES.
Specialist in concrete leaking. They provide 1 year warranty.
Facebook got live video and their product video. Hope this can help who needed...

Wondered if you can help me on my water leaking problems at my car porch.
My car porch have a flat concrete slab, and during heavy rain, the water will slowly drip through the concrete and onto my porch.

When I go above to check, i noticed cracks on the cement slab which may be the cause of the problem, especially near the edges (refer to picture). Note that I have done cementious waterproofing, and also coated the surface with epoxy resin, but that only lasted for a year before that gives way.

Would like to ask what can be done, and if we can do PU injection to stop the leaks. Or perhaps torch applied bituminous membrane ?


Appreciate if you can advise on my leaky problem...
Thanks!

My other tenant house has toilet leak issue, about 30qft. Get a contractor check, 1st method hack cost 2.5k, 2nd method apply Epoxy (not flake type), 3 layer, floor and wall (4ft), RM800.

My water leak only happened after 5 years.

Doe applying grout sealant solve the toilet leaking?
I plan to DIY instead of applying the Epoxy

May I know how much the grout sealant cost and what type of grout sealant I should look for.
And what type of Epoxy and cost to use if plan to apply.

Thanks for advice.

Sorry for the delay update. I wasn't accessible to my computer for one week due to outstation =)

I semi-retired doing waterproofing work already. Hahaha!! However if you want a truly specialize waterproofing contractor around klang valley. Those only do waterproofing and rectifying water leaking. I could share their contact number here. I can find my old specialize waterproofing contacts at Johor and Penang area too after i ask their permission. =)

I classified two types of waterproofing contractor.
1) A waterproofing contractor specialize doing commercial big development project (example: Shopping mall, Condo etc)
2) A waterproofing contractor specialize doing only residential house (example: house toilet, shop toilet)

I will share their contact numbers here after i get their permission. Because some of them are attached to manufacturer waterproofing plant.

I met the waterproofing contractor that using another method more or less similar method like Epoxy flake waterproofing but without apply epoxy final layer. Less slippery and pretty good looking too.



Its finishing using those typical pebbles type and he did a very slope. Water flow down to downpipe very fast leaving the area floor dried up very quick. Due to pebbles rough surface, its not slippery at all.

I will explain in more details his method on my next post.

Hmm.. The waterproofing products is wrongly used. Never use "cementitious waterproofing materials" apply at external area that exposed to sun and raining (roof, balcony, swimming pool).

Cementitious waterproofing materials can only apply at internal area like (internal toilet, internal kitchen etc). Areas did not exposed sun and raining.

Torch on membrane is good but expensive. And make sure the surface area has good slope. Water ponding above torch on membrane in a long period will peel off.



My advice apply those exposed waterproofing membrane acrylic copolymer design against sunlight and UV resistance. The finishing will be waterproofing membrane (grey color) embedded with fibreglass sandwich in between waterproofing membrane. Apply minimum 3 - 4 layers waterproofing membrane because this is external area.

All development project using this type of design waterproofing method if architect specify exposed waterproofing at roof top. Waterproofing manufacturer usually recommend this method.

Epoxy resin eventually will wear out apply at external area due to raining and sun especially our tropical country. Within one year wear out most probably a very thin layer apply at the surface only. =)

In my experience grout sealant will not solved. Even if solved, the leaking will come back very soon. Grout sealant wear out very soon. Curiosity you mention 2nd method apply epoxy (not flake type) is it something above picture i post?

fuhh... the pebble floor is a nice way to refinish toilet floor & waterproof it too. this is brilliant

Interesting concept. Is it more expensive than regular Epoxy flake waterproofing?

Hello,

my first floor ceiling was damp/ and water was seeping down the corner. Contractor came and checked and said have to hack wall as suspected pipe abs leaking. Upon hacking found abs pipe not leaking, infact no idea where leaking come from. Now found out that neighbor next door is having leaking right at the same spot so the leak may infact come from her side

Q1: should i seal the wall or wait until leak is confirmed from neighbor?
Q2: should i just change the abs pipe anyways since already paid for the job?
Q3: if i ask someone to check and give quotation, do i have to pay anything if i dont hire him?
Q4: should i ask compensation from neighbor for the leak/damage to my house?
Q5: what happens if we cant find the leak from neighbor's house as well? Any ideas?
Q6: typically what would be the cost of this kind of service?

This post has been edited by chichichi: Aug 22 2017, 05:35 PM

Hi,

Please pm the contact for the water proofing specialist in klang valley doing small house toilet projects. Many thanks

Hello

Need advise here, my bedroom has a major leaking issue.

Below is the detail :

It is a renovated room under a concrete walkway
The leaking coming from the walkway and also the wall
It is effecting my whole bedroom.

Any suggestion on how to handle this issue or anyone can refer me good contractor that can resolves this.

My house is in Seremban Town.

Thanks.

May i know how much is the market charge for pu injection? By number of holes? How much per hole? Thx in advance.

when there is construction joint, usually they will be grout tube inside.

My questions is it is we always have to inject the acrylic gel into the tube after the concrete completed. or it is only inject the gel when there is water leakage.

this is scenario base on construction stage.

Hi sir,

I suspect my newly bought condo unit to have some water seepage from shower to the wall. Paint on the wall right outside the shower area have some bubbles / wet mark. The wall is dry now as bathroom have not been used for a year. Switched on all water pipe for 2 days and wall still dry hence i believe piping still ok.

Any services that you can recommend?

Many thanks.

is this New Condo like BRAND NEW or you just bough a resale unit?

which area of wall outside shower area is leaking? wall inside bathroom outside shower area?

usually wall waterproofing only until few inch from floor, the rest of the floor usually use tile to cover. even with waterproofing the normal paint used indoor may not be suitable for wet environment and should use waterproof paint used mainly outdoors, or maybe add a sealant on top of the paint.

when water sips in from surface and cannot escape bubble starts to show.

if got photo easier to tell.

Hi Sir,

Many thanks for your reply. the condo is subsale unit.

the wet sign is at wall outside toilet. not inside.

Below picture for reference.

After 7 years of ignoring the leaking.. finally..

From this


into this


It cost me rm970 for this small toilet.. and I can get it at rm800 if the epoxy is just of a single color.. This price is for toilet below 30sqft. It's been 2 months now, and I still dont see any leaking.. Phewwww.. what a relief.. Looking from far away, the pattern looks nice, but when looking closer, it's farrrr from perfect. Not as beautiful as the one I saw in a hotel.. The lines/pattern boundary are blurry ... lots of color.. how do i say it, color bleeding? something like that..

This post has been edited by zeese: Mar 1 2018, 06:02 PM

so what did you do on the toilet actually other than changing tiles?

ok so what is on the other side of the wall that has the bubble? is the other side tiled? or just bare wall? gets wet often?

show us what's at the other side.

This post has been edited by advocado: Mar 1 2018, 06:58 PM

I'm not changing tile! I'm putting epoxy coating on the floor.. It's like you spread a glue (epoxy coating) all over the floor (no tile removal), then sprinkle a colorful flake on it, then finish it off by spreading a last layer of clear epoxy coating above it..

This post has been edited by zeese: Mar 1 2018, 07:26 PM

So far got no more leaking? U satisfied with the solution n workmanship?
Im planning to do epoxy flake coating also but need to find trusted installer first.

can u share the pics of the process they did to prepare such flooring?

but color change to purple and got new grey pattern. those are the epoxy or the flakes?

the epoxy not slippery?

u got put epoxy few inch on the wall above the floor?

Interesting, didnt realize such a product/solution exist! thanks for sharing.

Did you DIY or hired a contractor.

I just goggled and found pretty straight forward in application, but a little pricey, i think?

https://www.youtube.com/watch?v=8LBT_3JnJ3E

https://www.lazada.com.my/epoxy-colour-flak....750b126c5SK8tC

this things, if bought in bulk package should be cheap

this one seems to be like repacked. u know lah, repacked things are usually marked up very very high

Yeah. No more leaking. I am satisfied. About workmanship, I mentioned in earlier post, it looks beautiful from afar, but at closer look, i think they can do it better.



I just took 1 picture.. this is the early process, after sanding the tile. Marking & masking according to required shape/pattern. Then, applied a glue (epoxy) on selected part, then, sprinkle a whitish flake. Wait till dry. Then, re-adjust the masking tape and apply glue on another part followed by sprinkling a purple flake.. (just like how to paint a car with multiple color that requires lots of masking tape).

Yes..those colors are a flake, that looks like a flour/sand to me, and they also applied on the bottom part of the wall too ... The floor surface is not smooth actually, so, it is not slippery. They can make a smooth surface, if it is for table top application.


I just hired someone after I search on fb/mudah/lelong. Keyword I use was "epoxy+flake+toilet". In theory, it looks easy, but when I saw them do it, the first thing they did was sanding the tile to remove the slipperiness of the tiles. It looks tiring to me. Anyway. from youtube, I agree it looks easy to DIY especially if using just 1 flake color.

This post has been edited by zeese: Mar 1 2018, 10:47 PM

may i know what is your toilet area so i will know roughtly how much / sq ft the cost is

they sand it using sandpaper manually?

Mine is below 30sqft... Anything 30sqrft or smaller, the price still the same. That's the min price..
The guy sanded using hand drilling tool..

The other side is tiles. water heater/shower right behind this wall. Hence, when shower, the wall which is tiled gets wet often.

tiled from shower height to bottom? or above is not tiled?

also does it get wet only when shower used? is there water pipe running inside that wall?

are you sure is hand drilling tool? last i check, either not enough torque or too much rpm. tools used for grinding tiles is special one, much more expensive than drill.

and no car polisher doesn't work too well too.

Anyone can recommend me a good contractor in water leak problem? Leak found at toilet and minor in 3rd room apartment

Tq

hi there,

whats the best solution for water leakiing from a flat RC roof to the room upstairs? from my observation the leak is caused by the cracks on the flat RC roof, and any recommended contractors?


thanks in advanced

charles

I install awning, problem solved.

install another awning over flat RC roof? coz part of my room is flat RC, will it be cheaper?

install another awning over flat RC roof? coz part of my room is flat RC, will it be cheaper?

Yup, that is what i did.

think you still need to do some curing for your slap surface (floor).

Having awing alone, might not be helpful all the time, coz, our rainfall here are windy and strong, hence water culd still be pushed in to your floor.

Okay, i will put membrane to it later...

Hi are you still in the water leaking / waterproofing business? Need some advice and solution. Hope you will be able to help. Thanks

Is there a way to check water leakage for pipe concealed in a wall? Any sensor which can pin-point the exact location where the leakage occur?

Not in walls

infrared camera/thermal imaging; water dye; some of the methods, but I doubt its available in larger scale in Msia

Hi, all need some help.
The home sky glass post few issues:-
1) water leaking
2) Hot sunlight make house hot, aircon unable to cool
3) Below sky glass got electronic stuff (hazard if water leaking)

Option to rectify:-
1) Reseal the silicon on skyglass
2) Install super black tint to prevent sunlight and heat
3) Extend tile roof pass the glass ( no rain drop to glass and shelter for sunlight
4) remove glass and concrete slab

appreciate your suggestion. the top sky sunlight shine through house not important because
got side glass with grille already.

Plan to use Option 1 and 2 but not sure if long term will occur again.
Insomnia sleepless night.

Appreciate yout help. Thank You all

This post has been edited by arju: Apr 5 2018, 10:57 PM


Attached thumbnail(s)

leak :
1. always seal up leak from the source. leak from outside, seal from outside, no point seal from inside as seal will fail easily.
2. since it is glass and outdoor, something like silicone weather proof acetic type would do fine.
3. for added durability, cover the seal with aluminium tape or those rubber flex tape.
4. check the cement for cracks/microcracks........especially at the places where the cement makes a right angle. can fill them up with water proof putty filler for big cracks, for small cracks, can use water proof paint.

heat :
1. if want to have light with lesser heat, can consider those car tint like solar guard/v-cool etc.
2. if totally don't want the light to go through but don't want the hassle of removing the glass, can just paint the inner surface of the glass...........then it will look just like ceiling.

Water leaking inside wall of wet kitchen, wet kitchen was done by extending few years back ago. Only solution is to hack and redo piping is it?

Depends on source of leak

thanks for swift reply. what if extend the roof tile to cover the sky glass will totally
solve the issue especially water leaking? i not sure if seal method next few years problem
will rise again. what is the duration to reseal again after 3years? thanks

It all depends on the source of leak. If can't identify, then can't Solve.

The usual case of a silicone seal fail is due to weather and uv. If covered by alluminium tape after the silicone cured, it will last almost forever.

If silicone alone(assuming the correct type), usually can last more than 10 years.

thanks bro. hehe

I think is the incoming pipe leaking, as when i vlose all water, the water meter is still lk running on its own

There are few way I do before for concrete curing
1. Using guni bag put wet guni bag on the concrete surface to reduce the heat. ( for small scale slab )
2. Spray water three time during day time ( for few hundred m2 slab )
3. Using ice tube this method only use for dam constructor.

Try to search Js Star Constrution services in facebook.
They got alot of photo. Hope that can help you. Thanks.

Do you know where I can buy Xypex and find people who know how to apply them? Thanks.

Hi Sifu,

I stays in apartment, notice the water resist come over. What might be the cause?


Attached thumbnail(s)

Hi, will you able to quote me for waterproofing works? My existing waterproofing membrane is damaged and I'm looking to repair it.
Thanks.

you know how in some terrace house it's quite common to have an open air area in the middle that hosts the water tank. i think the rain water is seeping into the rooms' ceilings from there. any permanent solution to this? i'm worried water proofing will not last long as that top part is exposed to weather.

Hi... Can anyone can recommend me the waterproofing technician?

Hi, any water proofing contractor that can detect leak sources to be recommended? I done waterproofing twice on my concrete slab roof but it didn't solve the problem entirely. Need contractor that can and will help detect leaking sources.

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.