Re: Waterproofing a cement roofdeck
Thoroseal is a cementitous type of waterproofing and I personally would not recommend that type of waterproofing on your roofdecks cause of surface movement. Cement = hard so movement = cracks.
Another thing is epoxy is never recommended on waterproofing of roofdecks. Yes, it is good for cistern tanks coz it comes out with a tile like finish - but remember that tanks are not exposed to uv rays and epoxy generally deteriorates on uv rays (you can ask the distributors themselves and they will tell you that).
Tiles does not in any way affect waterproofing. Even using a good sealants on gaps and fills would not affect it. I really recommend Flexseal to waterproof your deck roofs coz it is the only brand in the market today that specifically says it is used for it (not one of the other elastomeric paints in the market recommends it for deck roofs) - you can ask the dealers about this.
Re: Waterproofing a cement roofdeck
Flexseal ba is from Boysen?
How about a cementitious waterproofing additive applied as a plaster on top of the roofdeck?
Re: Waterproofing a cement roofdeck
Thoroseal is a cementitous type of waterproofing and I personally would not recommend that type of waterproofing on your roofdecks cause of surface movement. Cement = hard so movement = cracks.
Another thing is epoxy is never recommended on waterproofing of roofdecks. Yes, it is good for cistern tanks coz it comes out with a tile like finish - but remember that tanks are not exposed to uv rays and epoxy generally deteriorates on uv rays (you can ask the distributors themselves and they will tell you that).
Tiles does not in any way affect waterproofing. Even using a good sealants on gaps and fills would not affect it. I really recommend Flexseal to waterproof your deck roofs coz it is the only brand in the market today that specifically says it is used for it (not one of the other elastomeric paints in the market recommends it for deck roofs) - you can ask the dealers about this.
Can I still cover the roof deck with tiles after applying Flexseal?
Re: Waterproofing a cement roofdeck
Boysens' Plexibond is specifically designed for Roof decks and Firewalls. IMHO is better than elastomeric paints.
GACA CONSTRUCTION
Re: Waterproofing a cement roofdeck
Has anyone tried Power Mix?
My contractor is going to use this to waterproof my deck. He said it is both cementitious and flexible. He will apply this before covering it with cemment and tiles. As for the number of coatings, I will still have to ask. But your recommendation is very much welcome.
Thanks.
Re: Waterproofing a cement roofdeck
Me i've tried "Powermix" and a similar product, "AllWeather Concrete Bond". I've tried them both in roofdecks in separate occasions and they performed well. Hanggang ngayon wala pa rin tagas. They are mixed with cement at certain ratios. I've noticed one time may leftovers na napadikit sa plastic cover nila at natuyo, nun pi-neel-off ko sila, I've noticed the film (a mixture of cement and the liquid) is really tough and flexible, parang elastomeric sheet.
Re: Waterproofing a cement roofdeck
Boysens' Plexibond is specifically designed for Roof decks and Firewalls. IMHO is better than elastomeric paints.
Had a problem with this product. Leaks re-appeared even after applying 3 coats in our roofdeck
. 🙁
BTW, does anyone here know the supplier/distributor of FlexSeal? Please include also where I can buy fiberglass membrane & industrial rubberized elastomeric sealant/paint.
I'm having our roofdeck re-waterproofed. Cheapest quote that I got from Contractors is P 47 K (Labor & Mat'ls). I might spend less if I buy the materials & just hire skilled painters to do the job.
Would appreciate anybody's help. 🙂
Re: Waterproofing a cement roofdeck
Had a problem with this product. Leaks re-appeared even after applying 3 coats in our roofdeck
. 🙁BTW, does anyone here know the supplier/distributor of FlexSeal? Please include also where I can buy fiberglass membrane & industrial rubberized elastomeric sealant/paint.
I'm having our roofdeck re-waterproofed. Cheapest quote that I got from Contractors is P 47 K (Labor & Mat'ls). I might spend less if I buy the materials & just hire skilled painters to do the job.
Would appreciate anybody's help. 🙂
Flexseal ------> Campbridge waterproofing System Inc.
Head Office
1370 JOSE ABAD SANTOS AVENUE, METRO MANILA, PHILIPPINES
TEL NOs: 252-0531 (connecting all departments)
FAX NO : 252-0551
Branch Office
1390-A G. ARANETA AVENUE, QUEZON CITY, PHILIPPINES
TEL NOs: 414-5096, 412-0344
I ordered directly to them. They give discount on volume order. You can contact them for technical support on its application.
If several gallons lang sa distributor/hardware ka na lang umorder.
http://www.campbridge.com/Distributors.html
I haven't tried flexseal on roof deck but they recommend several coatings plus the mesh membrane to bridge the crack.
If your going to waterproof the roof deck you need to removed the concrete topping and existing waterproofing. Clean the concrete surface, apply primer then several passes of flexseal. Lastly new concrete topping to protect the waterproofing from human traffic.
Re: Waterproofing a cement roofdeck
^^Thanks for the tip Sir! May I know what you use for waterproofing? Do you have any idea how much Flexseal I will consume for a 50-sq. m. area ?
Re: Waterproofing a cement roofdeck
^^Thanks for the tip Sir! May I know what you use for waterproofing? Do you have any idea how much Flexseal I will consume for a 50-sq. m. area ?
I used 3 ply waterproofing membrane (hot applied), 1 roll = 8 sq.m less than P4,000/roll. Eto lagi kasi nasa construction guidelines & recommendation ng mga building admin/owner sa mga projects that we handle. I have no choice but to follow.
I'm using Shell flintcote black primer 2-3 coats, then apply membrane using LPG torch to heat the underside. You need to conduct 24 hrs flood test, cover all the drain and pour enough water. Pag wala ng leak sa underside ng concrete slab, saka pa lang mag lagay ng concrete topping.
Re: Waterproofing a cement roofdeck
Now I'm confused what to use. :confused: Should it be elastomeric paint + membrane or torch-applied membrane? Actually I talked to a number of contractors already & they all have different suggestions.
Gusto na kasi namin na sigurado yong waterproofing ngayon. We've been disappointed w/ the past jobs already.
Contractor ka pala Sir. Thanks for taking time to answer my queries. 🙂
Re: Waterproofing a cement roofdeck
^^Thanks for the tip Sir! May I know what you use for waterproofing? Do you have any idea how much Flexseal I will consume for a 50-sq. m. area ?
For a 50 sq.m. roof deck, you may need around 18 gallons of FlexSeal. Buy two colors like black and terra cotta so that you would know if you totally covered previous coating. Give an interval of 4 hours drying time (8 hours is best).
What we usually do for our project is this system:
1. Coat all area with FlexSeal Terra Cotta.
2. Then with FlexSeal Black.
3. While the coating is still wet, lay a sheet of polyester reinforcing mat - then coat with Flexseal Terra Cotta.
4. 4th coat - Black, 5th coat - Terra Cotta, 6th coat - Black.
5. And finally 7th coat FlexSeal Terra Cotta - and while the coating is still wet - introduce fine grain sand on the surface - the reason is that the sand will increase bonding with your concrete topping later.
6. Allow a few days to let the waterproofing dry completely, then flood test it.
Hope that helps.
If you have more question, dont hesitate to call Campbridge at 252-0531. Or email me [email protected].
Peace 🙂
p.s. the material cost will be around P 8,550.
Re: Waterproofing a cement roofdeck
Re-asking in this thread as there may be new suggestions.
I have a 4 decks/balconies in my house, all with Mariwasa tiles and all, after 7 years are leaking. Didn't know whit about waterproofing when my house was built so can't tell you what the contractor used but I recall he painted something reddish that he says ends up rubbery, then topped with tiles the normal way.
Initial problems we had were leaks where the drains are. We had to dig out the drains covers, reapply this magic reddish goo, then reinstall the covers.
Next summer, we plan to tear out all the tiles and apply waterrpoofing since our ceilings have ugly water spots already. This is a costly and grossly inconvenient activity so would appreciate advice on how to do this for good.
Re: Waterproofing a cement roofdeck
sayang naman yung tiles. Unless the tiles are cracked, they're waterproof. The leaks are likely to be in the grout, the spaces around the drain, and the borders between the floor and walls.
Maybe it's possible to re-grout the tiles, then use a grinder to remove concrete at the borders of the walls and around the drain, and also remove the cracked tile. After that you can apply waterproof cement to seal the borders and fill the cracks ( I've had good results with waterplug ). Basically, you replace the exposed concrete with hydraulic cement (and that includes underneath the drain covers). That waterplug's expensive, but it works.
I've avoided having to remove some compromised concrete topping by grinding out the wost spots and applying waterplug in strategic places, the stuff flows inside the spaces and expands. Kung baga, it goes where the water goes, then turns into cement.
Also, you might consider applying cementitious waterproofing to the walls around the balcony as well, baka naman the leaks are through the walls via osmosis.
This might not work, but considering the cost of tiles, it might be worth a try.
BTW, the waterproofing method i picked up from this forum works. First fix cracks with hydraulic cement, then thoraseal or mortarseal on top. Over this goes flintkote, then polyurethane matting especially the corners, then more flintkote. Once the flintkote's bone dry, concrete topping. The first layer will almost do the job, but any shifts in the concrete or cracking will negate this, that's why the bitumen layer goes on top, to bridge potential cracks as well as decrease the hydrostatic pressure. The polyurethane matting gives the bitumen tensile strength, and facilitates removal of the bitumen 10-20 years down the road if maintenance needs to be done.
I'm a bit wary of rubbery waterproofings. No waterproofing lasts forever, bitumen gets washed away, cement-based waterproofing cracks. But you can patch cement based waterproofing, and bitumen can be washed away or cemented over. But that rubbery stuff might have to be ground away when it fails.
Anyway good luck!
Re: Waterproofing a cement roofdeck
For a 50 sq.m. roof deck, you may need around 18 gallons of FlexSeal. Buy two colors like black and terra cotta so that you would know if you totally covered previous coating. Give an interval of 4 hours drying time (8 hours is best).
What we usually do for our project is this system:
1. Coat all area with FlexSeal Terra Cotta.
2. Then with FlexSeal Black.
3. While the coating is still wet, lay a sheet of polyester reinforcing mat - then coat with Flexseal Terra Cotta.
4. 4th coat - Black, 5th coat - Terra Cotta, 6th coat - Black.
5. And finally 7th coat FlexSeal Terra Cotta - and while the coating is still wet - introduce fine grain sand on the surface - the reason is that the sand will increase bonding with your concrete topping later.
6. Allow a few days to let the waterproofing dry completely, then flood test it.Hope that helps.
If you have more question, dont hesitate to call Campbridge at 252-0531. Or email me [email protected].
Peace 🙂
p.s. the material cost will be around P 8,550.
I might give this approach a try next year. My 4-year old house has leaks too on the apprx. 40 sq. ft. front deck that even numerous repairs didn't yield good results..kbwisit lang tignan ang loob ng bahay.
