the 2nd idea is better for my case since i don have much space left.can they install it without space underneath the roofing sheet?

and for the depth?u mean the concrete slab depth?

No, how far to the back you extend from the existing wall.
You need some kind of frame underneath the sheet to tilt it at any angle. You can use timber battens.
And the gaps at the sides?

8 ft from the existing wall.
i was thinking of closing the gap of the concrete slab and roof rather then opening it as maybe it will attract pests and water may go in

It will also also look unsightly.
You don't have much of gradient for water to flow (3" over 96"/8ft)

agree.but as long as it can prevent the water from flowing into the room then i m ok with it

It will. Use Lysaght Kliplok which can take go down to 1 degree pitch.

http://www.lysaght.com/product/lysaght-klip-lok-406

6 inch reinforced concrete slab is definitely impermeable. Make sure the reinforcement (steelbars) go into the wall. After that, apply water proofing (looks like milk).

where the water will exist? out from the roof or still using the pipes area in the roof??

nobody wan quote me the price of awning on top of concrete roof.can anyone tell me how around per sqft?

With small job like that, it's hard to get a quote based on sq ft.
If I were to give a guesstimate, I'd put it at abt RM3.00 psf.

PU grouting is the best

Not under the circumstances as discussed in earlier threads. Can you guarantee?
I guarantee no more problem with another layer of roofing over.

This post has been edited by tehtmc: Feb 29 2012, 10:14 AM

hi all, sorry to interrupt, but i have a solution for concrete waterproofing. we carry other products too. let me know what u needs and we will quote accordingly.

TQR

i have similar problem for my house, exactly like your problem. Do not waste time and money on doing waterproof on concrete slab, it probably can last you for couple of years, but not long.

I just extended my roof tiles to cover my concrete slab last week, this is the best solution i found. It cost me about RM5500.

With roof tiles slope, 1 tile break, you replace 1 roof tile, very simple and cheap.

Your concrete slab on 1st or 2nd floor? As I extended to 2nd floor, where guess not space to put tiles roof anymore, but still explorer the possiablilities lol

my concrete slab is on 2nd flr, you can talk to contractor to do it. I asked indonesia worker to help me, they are expert in this. Nowadays, all structure work are mostly done by indonesia workers.

I guess your tangki is on top on slab, so you need to move it back to existing roof.

waterproof on concrete slab is not proof, i used to be like you. Patch here patch there, never ending. Very upset, decided to cover it up with roof tiles, now no more leaking.

for my house design,it is hard to use roof tiles.only awning option.if wan to redo the roof tiles, the original roof of the house and the wood inside need to be restructure.

yes, i restructure my original roof and wood structure, they lifted it up. done in 4 days

Your meant they actually moved existing Roof structure and rebuild the whole Roof to be able covered the concreate slap?
Any photo?

I am quite worry since so many negative feedback of concrete roof of leaking. My contractor told me that he applied 5 layer of the chemical water proofing which is more than enough. But what I heard from my friend, he also experience the leaking problem that if it not covered by roof tile, it is better to apply the glue with fibre. Anyone heard of this method? How effective it is?