Re: Using cement as roof..
Ahh leaking from roof deck, same problem in my house
Targa, Do you know what type of water proofing was used? heat activated asphalt looking thingy? or cement based ? or something else?
injecting the epoxy will not stop it at all. If you will have to apply epoxy you will have to cover the whole area. because the line where the cement and epoxy meets will always have a gap because they are not the same material.
Thoro seal is awesome. its great. but just like epoxy you have to COVER the entire area with it otherwise it wont work. for best result dapat pa tik tik mo uli yung cement floor, pahiran mo ng 2 to 3 coats of thoroseal then palitada. Or better yet after thoroseal tiles it then as grouting use SIKAFLEX, its heavy duty stuff. We used it on water proofing insulated stainless steel..
Tiles can be cheap. sikaflex might be a little more dear. Thoroseal isnt cheap 🙁
Sa experience namin masmadali lang iapply ung thoro seal unlike tiles kuha kapa ng Laborer mo tpos di mo pa alam kung ilang days gagawin base sa area ng slab mo....Base lang po sa experience namin dito sa baguio...
Re: Using cement as roof..
You can use cement but it can be bulky and sometimes cracks can come after sometime.So you should discuss with some home renovator or contractor first before taking any decision.
I know one of them you can take help of him he helped me a lot at the time of my home's renovation.
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Bathroom Remodeling Contractor
Re: Using cement as roof..
mga friends bka may problem pa kyo sa mga leak, u can txt me 09219148053, free estimate
Re: Using cement as roof..
Just my 2 cents...
In my former office, we probably had at least 2 waterproofing suppliers for our leaking concrete slab roof and our experience was the same: the leak will be back after a few years, even before the warranty expires. An expensive consultation with a well-known engineering consulting firm yielded the following recommendation: a long term permanent solution is to build another level with a GI roof! And this advice I followed in my own house.
A friend who is in the waterproofing business also said that any waterproofing system, including the expensive welded rubber membrane, only lasts a few years. And from our experience in our office building, tracing the leak for a repair job later on a membrane waterproofing, is a challenging task.
Hope this helps.
Re: Using cement as roof..
One critical factor in preventing leaks is having an efficient drainage. As long as the water do not form pools on your roof deck you'll be fine even if its not fully water proof.
Imagine your GI roof. Its not 100% waterproof, water can still seep through the joints. But since rainwater immediately flows off the roof, you don't have leaks. Same principle is true for your concrete roof.
Re: Using cement as roof..
One critical factor in preventing leaks is having an efficient drainage.
That is very true. Ponding can overwhelm waterproofing.
One other weak area on decks is the joint between your waterproofed deck and the drain. In my decks, I experienced leaks the first few strong rains and found out that rainwater seeps through between the waterproofed concrete and the PVC drainpipes. You will need to overlap your waterproofing layer from the concrete into the drain.
Re: Using cement as roof..
good evening, i am a new member here. the contractor who poured our concrete roof deck integrated sahara into the concrete, 1 pack of sahara per bag of cement. would this be sufficient as waterproofing for the roof deck?
Re: Using cement as roof..
is the concrete from a batching plant? if no, most likely not. Sloping the deck to a drain may help.
Re: Using cement as roof..
How about this thing that the workers where applying like paint on our firewall? I think it's called Thoroseal. They said it's for waterproofing. After it dried, it kinda have that rubber-ish feel on it.
Re: Using cement as roof..
How about this thing that the workers where applying like paint on our firewall? I think it's called Thoroseal. They said it's for waterproofing. After it dried, it kinda have that rubber-ish feel on it.
So that no one thinks of literal "rubber"
Thoroseal is not just an elastomeric surface treatment
It is a waterbased, penetrating concrete-sealer.
The dry-mix is added to water, which in solution treats the concrete itself:
after the solution seeps into the porous concrete, recrystallization of the
solids plugs up micro-voids, and reduces porosity ---which greatly limits
the ability of moisture to pass through the concrete. A polymer component
imparts some flexibility.
As I understand it, even as the concrete develops minifractures, the very
moisture seeping in can redissolve and redistribute the sealer, which then
recrystallizes and plugs the new gap --and fractures rarely happen through
-and-through at once: they start out shallow, which means they can be
resealed BEFORE they grow through-and-through over several seasons.
Obviously, large gaps like cracks are beyond its ability to address, which is
why a complementary product, Waterplug, (essentially patching compound)
is required to pretreat such gaps.
I've had very good results with Thoroseal (especially with new construction
and specifically aboveground ponds and small wading pools), which is THEN
surfaced with an elastomeric seal (either applied fluid or solid membrane).
These are not just roofs, but water-storing applications with depths of 1.2m.
The problem with cure-elastomers is that they adhere to concrete, which
can fracture as it shrinks under thermocycle. The threat of moisture just so
happens to coincide with the cold phase of that cycle, and 'cold' means that
your elastomer is no longer so flexible: it can crack precisely along the same
lines at the concrete it's adhered to. Bituminous treatments suffer the same
vulnerability, and cannot flow to heal breaches until the next warm cycle.
You often have to keep renewing such fluid applications --and that's a viable
way to do things. Elastic membranes? They cost a lot, and then require add-
on protection from damage, as well as failsafe backup in the form of other
waterproofing treatments described above.
-=-=-=-=-=-
I've done sloped, poured concrete roofs before: for mausoleums.
As I said in the other thread: drainage is key, and with slope, the need for
waterproofing is lightened. Just Thoroseal (which dries white) and then paint,
and done. One mausoleum has been without leaks since 1992: hip roof, 4"
RC slab, 10mm rebar @ 0.40 O.C. B.W., 30 degree slope. Concrete mix was
prtreated with Sahara WP compound, and was a pain to pour --indeed, it was
more like hand-plastering than pouring. Thoroseal after curing. No rooftile.
The owner has had the roof repainted just twice, for looks, 1996 and 2009.
Keep in mind that what works for one problem may not work for another.
[COLOR="DarkGreen"]tl;dr: Just ask your architect what best suits your situation.
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Re: Using cement as roof..
Guys,
I need your advise. I plan to build a 2-story house but my budget is not yet sufficient. Paano yung design sa bahay ko kung ung bubong ko ay semento. kelangan kc in case may pera na ako, dugtung na lang. Ok lang ba tingnan yung bahay pag parang square. Thanks.
The house I plan to build in the next 1-2 months will also have concrete for roof. As far as design is concerned, its more practical as you can use the area as a roof deck. As to what you mentioned "Ok lang ba tingnan yung bahay pag parang square" ... you really need to look at a lot of the house design in the intenet and then use it in your house design para hindi siya mag mukhang square ... In my case, I use the split-type house design (with a bahay kubo concept) para hindi naman masyadong mag mukhang "boxy" yung house ko 🙂 ... the kitchen/dining area has a different height ng concrete roof and the living room and family room area has a higher concrete roof ...
Re: Using cement as roof..
One critical factor in preventing leaks is having an efficient drainage. As long as the water do not form pools on your roof deck you'll be fine even if its not fully water proof.
Imagine your GI roof. Its not 100% waterproof, water can still seep through the joints. But since rainwater immediately flows off the roof, you don't have leaks. Same principle is true for your concrete roof.
I do agree with this. And this was also the advice given to me by my archi friends when we were finalizing the design of the house. For the house that I will be building, the roofdeck was designed with an inclination of about 25mm towards the middle portion of the roof where the roof drain canal will be located. The drain canal will also be inclined to one side of the house so you only need 1 big pipe for drain. Future plan is to collect this rain water and store it in a ground reservoir for later use, same as what my grandfather did in his house in the 50's ...
Re: Using cement as roof..
My garage is currently under construction. And at this point, the beams are already being constructed. A few days from now, I think it'll be the slab. I'm researching on waterproofing too as the slab will be open. After reading here and there, I came across Boysen's Plexibond. It looks promising. Is there anyone here who have tried it already?
Re: Using cement as roof..
If im not mistaken Boysen Plexibond for vertical waterproofing like walls not for floor/slab.
Re: Using cement as roof..
If im not mistaken Boysen Plexibond for vertical waterproofing like walls not for floor/slab.
Thanks for the heads up, sir bryant. But I read from their website that it can be used for horizontal surfaces too. Yun nga lang, may additional number of coat required.
