Re: Using cement as roof..

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.

Re: Using cement as roof..

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

Re: Using cement as roof..

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

Re: Using cement as roof..

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)

Re: Using cement as roof..

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.

Re: Using cement as roof..

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

Re: Using cement as roof..

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?

Re: Using cement as roof..

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

Re: Using cement as roof..

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.

Re: Using cement as roof..

Salamat sa iyong advice sa akin saynts. More power.

Re: Using cement as roof..

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

Re: Using cement as roof..

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

Re: Using cement as roof..

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...

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 🙁