Using cement as roof..

[bugoy]

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.

[2diy4]

The main problem would be water seepage. You will need a good waterproofing, one that will seal even if the concrete roof cracks, as it likely will.

[bugoy]

Thanks for the info. If you don't mind,could you recommend good waterproofing sealants?

[2diy4]

I don't recommend a do-it-yourself sealant, but a hot application by professionals.

[koykoy]

i just finished my house with a roofdeck. so far no crack naman at walang leaks. already 4 months in this typhoon season and ok pa naman.

i think very important na the concrete slab, column, beams and rebars are properly designed so they would reduce the possibility of water leaks.

but in the event na may leak, id be going for cementitious waterproofing or membrane type. costs around Php 500 per sq.m (for the membrane)

[Bobby]

If you need a cementitious waterproofing, Id recommend Superseal mixed with Acrybond as Ive used that in my deck as well. For more than 5 years na wala pa ring leak. You can call up Ortigas Hardware at 6314059 - thats where i bought it from. Hope that helps.

[koykoy]

bobby: how is that applied? parang painting lang?

so far di pa naman nag leak ung roofdeck ko. it also helped na around 13cm ung thickness and monolithic pouring ung concrete (with the beams)

i experienced seepage sa mga walls ko kc di pa ko nakapag paint tsaka walang overhang ung bahay

[abet227]

The main problem would be water seepage. You will need a good waterproofing, one that will seal even if the concrete roof cracks, as it likely will.

Where can I buy here in Manila waterproofing materials for the concrete roof of the house I am building?

[hardworker]

Mga igan tanong lang po kung maganda bang ilagay ang yero ( GI sheets ) pang support sa pag concrete slab o talagang plywood ang inilalagay sa ilalim?Mag build po ako ng two storey appartment,pero yung second floor ang bubungan ay yero na po.Para magamit ko din po ang yero pang bubungan.Isa tanong papo kung mag concrete slab po ako sa roofdeck para siguradong walang leak na tutulo sa ibaba lagyan ko po ng concrete slab na 7 cm ang kapal at pagkatuyo ay latagan ko ng makapal na plastik ang kabuuan at patungan uli ng concrete slab na 7 cm puwede po kaya yung ganoon? TY in advance

[saynts]

unang tanong. kung ang tinutukoy mo ay ang formworks ng concrete slab, pwede mo namang gamitin ang yero na pang formworks yun nga lang ay pangit tingnan kasi alon alon ang ceiling mo nyan.

pangalawang tanong. haluan mo na lang ng sahara ang concrete mixture mo. isang bag ng sahara sa isang bag na semento ang ihalo mo. matitipid mo pa yung 4cm na kapal ng konkreto mo. mga P 1,114.00 per square meter din yun.

[hardworker]

Salamat sa iyong advice sa akin saynts. More power.

[targa]

saamin.. cement roof... may roofdeck.. tumutulo... pag malakas ulan... sira sira na paint and wallpaper sa loob... tsk tsk..

naka waterproofing naman.. and profesional contractor naman.. kayalang tumatakbo na.. di na mahagilap..

nung huli pina... inject namin mga parapet ng epoxy mga cracks... ano kaya magagawa? to eliminate leaks?

thanks

[makikulit]

ang problema minsan sa mga cement roof eh yung kulang sa pagakaka incline if flat ang pagkakagawa water stays longer sa roof.

[Farmbreed]

saamin.. cement roof... may roofdeck.. tumutulo... pag malakas ulan... sira sira na paint and wallpaper sa loob... tsk tsk..

naka waterproofing naman.. and profesional contractor naman.. kayalang tumatakbo na.. di na mahagilap..

nung huli pina... inject namin mga parapet ng epoxy mga cracks... ano kaya magagawa? to eliminate leaks?

thanks

Try mo Thoro Seal...my website yan isearch mo nlang sa google. Yan kasi gmit namin dito sa baguio sa mga concrete slab dito twing hapon umuulan...tested na namin yan...

[beebeenator]

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 :(

[Giovann_13]

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...

[willicooper1]

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.

___________________________
Bathroom Remodeling Contractor (http://www.handyamerican.com/homeowner-categories-bathroom-remodeling.asp)

[rmej10]

mga friends bka may problem pa kyo sa mga leak, u can txt me 09219148053, free estimate

[tony5]

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.

[joey81]

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.

[balarila]

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.