Hi guys, i am come across a thread there that mention resin injection can fix leaking.
Anyone mind to further explain it or can provide opinion whether it will fix my current problem ?

I did toilet/back extension with flat concrete roof by a noob person, it have leaking problem sometime when raining really heavily. however sometime it does not.

I consulted another contractor and he suggest I do awning to cover the concrete roof, somehow i come across this thread and I wonder whether this method will work.

He also told me the problem occur because the contractor do the extension in wrong way.
If there is no solution, it will cost a lot of money and time if Im going to redo/hack it.
He said the contractor do Picture A method, correct method should be Picture B. Last picture show leaking.

Thanks.

Picture not upload properly?
Ask my house mid doing renovation and also flat roof, hence interested to find out more and to prevent it too...


This post has been edited by Jo_da48: Apr 19 2011, 06:32 PM

i think awning shd be cheaper than hacking it up. plus, you should feel cooler by not having sun shining directly on concrete.

if water is seeping into the crack it also indicate poor drainage.

epoxy should solve the leak via through the concrete but i dont think it will stop the mushrooms from growing there.

resin injection/ pressure grouting not permanent solution,

try this :


cheap solution

OK. It indeed CURI AYAM...as it should be hocked with the original wall like below as well, else will able to see a crack line betwee the original wall and extended wall.

But than according to my contractor, it still have to verifier and hope to have a big rain than able to see any leaking or not..



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any flat roof will leak over time. you need a slope.

also method B is most certainly way better than A.

skng03 should be quite good. better even to put a proper roof on top.

bro, what is gi flashing tuck ?
screed to fall maybe not possible because wall is a bit higher than roof.
concrete kerb is it make thick concrete to cover the joint area ?

it look like this

water leaking is hard to identify the exact cause.

it might be due to crack on slabs, seepage, splashing etc.
the epoxy pump method is only when u have identified the cracks on slabs.

either apply another layer of waterproofing on top (to apply includes at least 1.5' on wall)
or cover direct with a roof

This is a picture of a new rendered cement wall(not painted)...today , there was a heavy downpour of rain..so I thought it is a good idea to check for leaks of flat concrete roof...

I found 2 leaks that are obvious but what about the picture below? the wall looks wet, when I touch it, it feel moist not wet..
any comments? The second is another room with flat concrete roof..and plaster ceiling(not painted)...looks like a leak..


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today noon was heavy rain, hence go to side and check the new ext roof up.
Apperancely saw it leaking but it was from the old wall (under the roof)because the wins blow and water flow a bit slow, which flow back to the old wall which without proper seal or waterproofing at all, hence the contractor will address and put waterproofing on it.

Question how long those WaterProofing could stand?

add spout pipe then....

for 2nd pic you might see the cracks if you opened up the plaster

but for 1st, it shows to moisture seepage... hard to identify the source.

still as per many above recommended. just built a open roof over it. rather than do another layer of waterproofing without guarantee it will works

This post has been edited by aLittleMisfit: Apr 20 2011, 09:50 PM

2nd picture for sure, I went up the roof and he cover the gap with a plastic sheet...only...(see below 5th pic with plastic only)

1st picture is moisture seepage, must be here at the concrete roof...(picture 4th) I climb up with ladder yesterday(pic 3) before the rain to take pics and check on THIS contractor's work...cannot trust him liau..

This post has been edited by jojozep: Apr 20 2011, 10:19 PM


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u can go and try to look for a liquid+powder (something like cement) mixture. the liquid looks like raw rubber....so u just mix it with the powder and then u apply it with a large paint brush. it is like a rubber when it is going to dry but then it will harden like a cement when it is really dry.

i'm having this problem too previously....what i did is to hack a bit of the part up, put some adhesive cement and then apply the above mixture. 6 inch above ground, problem solved so far and for added protection, paint with the waterproof paint.

go n ask the hardware shop...something called slurry.......if not mistaken, it is from UK.

hmm.. the work not yet complete. make sure there is gradient so no stagnant waters and it flows fast enough. if less gradient, seepage is common.
it serves no purpose to use good waterproofing cement or material if he doesnt applies it over the vertical wall.

heavy rain again...
Good to test and see whether the roof still leaking or not

http://www.sika.com.my/construction-waterp...djointtreatment

there is no water gutter & sealer. All this job by your contractor is unprofessional.GI flash will not do the job.

Is there suppose to be a gutter for concrete roof? I thought it will build a slope with a floor trap...