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  1. #1
    lob
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    reply to marmite

    yes i know its been a while but its been bugging me since i read your thread on the modern house you want to build. ref the flat roof. ive never had a prob putting my neck out so here goes..
    if i remember you were on about a concrete roof 500mil thick, man thats more than a war time airaid shelter. heres my take for what its worth.
    the prefabricated consrete slabs, 400 ish by what lanth u want, ie 4mts, now if u do as the thai do, use reenforced bar over it, 100mil concrete on top and u have a standard concrete floor, this should be waterproof as from my understanding 2inch of concrete cover is waterproof in/of itself, if u want to use the roof for a patio, then tiles will make it more waterproof, i slite run will do the rest. not overly expensive, but i wouldnt go over 4mts span. cant see a prob with it. cheers. sorry if its not in line with what u have in mind.

  2. #2
    lom
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    ^Do you know how much one of those costs?
    Marmite had a budget of 250K baht for the whole shack.

  3. #3
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    A sheet metal roof on a steel frame with insulation would be the way to go for cost, maintenance and performance.

    As for the concrete slab idea, the thickness was due to the unsupported 2m overhangs if I remember correctly. Anyhow, it was an engineer who gave me those figures and the MRT hasn't collapsed yet, so I trust him.
    Last edited by Marmite the Dog; 05-07-2009 at 06:14 PM.

  4. #4
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    Quote Originally Posted by lom View Post
    ^Do you know how much one of those costs?
    Marmite had a budget of 250K baht for the whole shack.
    Wonder how much you can build upon with only 250K?

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    Quote Originally Posted by Rural Surin
    Wonder how much you can build upon with only 250K?
    I was more realistically thinking about 400k, but 250k was a bit more 'controversial'.

  6. #6
    lom
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    ^ Back pedaler

  7. #7
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    I lived in one house in Ensenada that was all concrete and the concrete roof would gather up a lot of hear during the day and keep you toasty warm all night in the hot season and would get cold during cold spells and as far as I am concerned, it was the shits.
    Plus the fact that it held moisture and humidity and fungus grew on everything in the house.. never again.

  8. #8
    lob
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    As for the concrete slab idea, the thickness was due to the unsupported 2m overhangs if I remember correctly. Anyhow, it was an engineer who gave me those figures and the MRT hasn't collapsed yet, so I trust him.[/quote]


    ah yes the overhangs. i stand corrected. your pics didn't show overhangs if i remember correctly, pics without your details??.

  9. #9
    lob
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    Quote Originally Posted by blackgang View Post
    I lived in one house in Ensenada that was all concrete and the concrete roof would gather up a lot of hear during the day and keep you toasty warm all night in the hot season and would get cold during cold spells and as far as I am concerned, it was the shits.
    Plus the fact that it held moisture and humidity and fungus grew on everything in the house.. never again.


    yes this is a well known fact in the in crowd, condensation plus humidity plus lack of air flow = fungus/ bacterial growth. sorry to say yanks always know better.

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    Quote Originally Posted by blackgang View Post
    I lived in one house in Ensenada that was all concrete and the concrete roof would gather up a lot of hear during the day and keep you toasty warm all night in the hot season and would get cold during cold spells and as far as I am concerned, it was the shits.
    Plus the fact that it held moisture and humidity and fungus grew on everything in the house.. never again.
    Concrete is cheap and last for ages, but besides that it's shit in a hot climate. It should be used as little as possible, but for some reason here everyone builds there whole house out of it.

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    Quote Originally Posted by lob
    ah yes the overhangs. i stand corrected. your pics didn't show overhangs if i remember correctly, pics without your details??.
    They did show the overhangs.

  12. #12
    lob
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    Concrete is cheap and last for ages, but besides that it's shit in a hot climate. It should be used as little as possible, but for some reason here everyone builds there whole house out of it.[/quote


    do they??

  13. #13
    lob
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    Quote Originally Posted by Marmite the Dog View Post
    Quote Originally Posted by lob
    ah yes the overhangs. i stand corrected. your pics didn't show overhangs if i remember correctly, pics without your details??.
    They did show the overhangs.


    shit i'm losing the plot.

  14. #14
    lob
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    alright, how about a 500mil concrete ring beam around the top, another 400mil ring beam two mts out= overhang, and cpac and concrete over that, dont need 500 mil all over the roof. i have a balcony all along the front of my rooms, not two mts i think but not far short, 1 1/2 to 2 mts and thats how its built. mind you the rfb is 19 milx 4 if memory servs, only on the over hang. my plans are in korat so cant confirm at the mo.

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    Quote Originally Posted by lob
    alright, how about a 500mil concrete ring beam around the top, another 400mil ring beam two mts out= overhang, and cpac and concrete over that, dont need 500 mil all over the roof.
    Quote Originally Posted by Marmite the Dog
    A sheet metal roof on a steel frame with insulation would be the way to go for cost, maintenance and performance.
    .....

  16. #16
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    What type of sheet metal are you thinking of? The standard stuff here is very thin, the higher the pitch the longer it will last, apparently. I would use as little concrete as possible.

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    A concrete roof is obviously a very expensive option.
    It has a large thermal mass and would retain radiant heat into the night as others have pointed out. However if it was sealed properly it could be loaded with soil and planted with vines which would act as shade, thus turning a hot roof into a natural cooling unit during the day. Expensive and unconventional, but certainly possible.

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    ^ Doing this would push the budget right up.

    There was a thread on this a while ago, think it was called green roofs.

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