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  1. #1
    MrG
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    Foundations--pad Or Piles

    I'm doing the preliminary on a planned house build, probably a couple of years out. I saw some threads on a foundation that was a large cement pad poured over pilings. It was described as a "boat" foundation (upside down boat, I assume) but I can't find the thread or any other information on it.

    Anybody know anything about such a foundation? Any lead appreciated.

    Thanks.

  2. #2
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    poured over a ring beam? a raft foundation .. I think piling will defeat the object.

    depends on the earth.

    I 'm in a similar position. and was going for Line piles of a meter deep and half wide plus maybe sink a concrete ring around the base(below the line pile) of the columns. not all columns though.

    ourearth is virgin soil and I can't find the clay.
    will not put up wiv the "Nanny state" so don't push it on me.

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    just check with any local surveyor/architect etc

    they will let you know the best foundations for your area

    piles would only be needed if the subsoil is not compact for several metres deep

    http://en.wikipedia.org/wiki/Deep_foundation

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    Quote Originally Posted by adzt1
    I 'm in a similar position. and was going for Line piles of a meter deep
    the normal method here is to dig holes around 2 metres, usually to the clay or firm subsoil, then lay a pad. This can be around 1m square, or larger if the house is large

    columns are then made up from this to support the ring beam at ground level

    you can see this in several of the house build threads
    I have reported your post

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    yes that's what I was thinking. the ringbeam though will be a meter deep (line piles) and not cast from column to column .
    the column will base out from the top of the line pile (big ring beam ) and i might put the pad you suggest underneath the line pile at the point where I need good structural column s .


    as I said the earth I'm building on is virgin. I had a 360 machine dig exploration holes and couldn't find a nice clay bed.
    I've now put 600 tonne of soil on top that has been there for two years and was going to construct the foundations /base then backfill with another 1000 tonne of earth.
    wait another yr then cast a good strong floor slab that is tied to the ring beam .
    kind of like a raft or boat as the OP calls it.
    Last edited by adzt1; 10-10-2012 at 08:37 AM.

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    so when the floods come, you will be laughing

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    paddles and oar at the ready!!!

  8. #8
    MrG
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    Thanks for all the info.

    I don't know anything about ringbeams, though maybe I've seen them under another name.

    I plan on building a 1 story 3 bedroom over a wide area to avoid stairs. I would like the floor a meter above grade.The design has rooms built around an inside patio that would have a wooden, terrace type floor, so the house will be long and wide, but not high.

    My concern is that there is a lot of water around there (land borders levee water which connects the Mekong), and I worry about finding firm enough soil to lay the post pads. If not, posts alone may not support the house, but does the type of "raft" foundation described answer that problem, should it arise?

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    yes . I'm not sure but also with the raft . if it starts to move much you can add a small retaining wall at the perimeter . to stop the earth moving that your house is floating on.
    I think a raft is poured in one , with the thick at the perimeter (ring beam )then the floor slab grading to thinner on the inside .
    only good for one story though. but don't quote me on that.

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    Theres only one way of determining what type of footings/foundations are required for YOUR land and that is with a geotech survey, they will do a complete report and this report can then be used by your architect/engineer to detail your house with the correct structural design.

  11. #11
    M.A.D
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    You can drill holes or drive piles in. What you are looking for is friction.

    I have a thread in the construction file.

    The soil density is ultimate factor. I hope that helps.

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    Quote Originally Posted by MrG
    I plan on building a 1 story 3 bedroom over a wide area to avoid stairs. I would like the floor a meter above grade
    so you plan to never leave the house? or you mean no stairs inside?

    Quote Originally Posted by MrG
    My concern is that there is a lot of water around there
    that has little connection with soil density/compaction

    as said, you can have a few holes drilled to survey the land, or you can ask the local people what is normally used

  13. #13
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    friction piles is what carrabow is on about. a good idear , even with a raft but you need to go deep. specialist equipment . depends where you are I suppose.

  14. #14
    MrG
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    Thanks to all for all the info.

    The only stairs I anticipate will take me 1 meter high to the deck, from which you enter the house. Probably some stairs to the back and a nice garden.
    And no, I didn't know that soil density has nothing to do with it's proximity to water. Counter intuitive, but there you have it.

    The main concern is that I have a solution to a problem I am likely to come up against. I googled the word raft and found a raft (get it...?) of information and am reasonably satisfied that I'm going to be OK. Well, kind of, anyway.
    So onward. Will know more in January 13 when I'm there to look at the place. Doubt that I will have time to get a geological survey of the pad while I'm there, but I might try. That will really tell the tale.

    Will contribute more when I know something.

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    Quote Originally Posted by MrG
    Doubt that I will have time to get a geological survey of the pad while I'm there
    they only take half a day, drilling a few holes to whatever depth is necessary around the house footprint

    they also did a "smack" test for me, smacking a pole into the ground until it wouldn't go in any further, with the weight they had

    that indicated compaction and the depth to which the columns should be laid

  16. #16
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    cheapest and easiest way
    earth screw or earth anchor..

  17. #17
    ความสุขในอีสาน
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    Interesting thread Mr G thanks

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    M.A.D
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    Quote Originally Posted by MrG View Post
    Thanks to all for all the info.

    The only stairs I anticipate will take me 1 meter high to the deck, from which you enter the house. Probably some stairs to the back and a nice garden.
    And no, I didn't know that soil density has nothing to do with it's proximity to water. Counter intuitive, but there you have it.

    The main concern is that I have a solution to a problem I am likely to come up against. I googled the word raft and found a raft (get it...?) of information and am reasonably satisfied that I'm going to be OK. Well, kind of, anyway.
    So onward. Will know more in January 13 when I'm there to look at the place. Doubt that I will have time to get a geological survey of the pad while I'm there, but I might try. That will really tell the tale.

    Will contribute more when I know something.


    How many square feet of surface do you want to support? How many floors? Are you making a wood structure or a concrete fortress??

  19. #19
    MrG
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    Quote Originally Posted by DrAndy
    Quote: Originally Posted by MrG Doubt that I will have time to get a geological survey of the pad while I'm there they only take half a day, drilling a few holes to whatever depth is necessary around the house footprint
    Then maybe I will put greater effort into lining one up before I get there. Thanks.

  20. #20
    MrG
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    Quote Originally Posted by Carrabow
    How many square feet of surface do you want to support? How many floors? Are you making a wood structure or a concrete fortress??
    One floor.

    Anticipated making the standard cement and brick thai style, with some of the usual western ammeneties/modifications/safety considerations--nothing fancy, just good.

    Gross perimeter would be a 22m X 9m pad. The living areas would be built around an inside, open air, patio roughly 11 X 8m, which would be basically decking. The place seems a bit spacious so we are still trimming, but we have the room to build and we anticipate visitors.

    We have considered "exploding" different sections of the house with decking in between, therefore allowing seperate pads connected by decking instead of one big one. We rejected it for various reasons, but have not rejected it out of hand if it proves to be advantageous.

    The only wood structure I know that they build over there are teak, and we both decided against it. I have not investigated anything else, but if there's a lead I would be grateful to follow it.

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    Quote Originally Posted by MrG
    The only wood structure I know that they build over there are teak
    they build with all sorts of wood here

    Teak is the most expensive and desirable but other woods are also excellent

  22. #22
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    Quote Originally Posted by MrG
    I plan on building a 1 story 3 bedroom over a wide area to avoid stairs. I would like the floor a meter above grade.The design has rooms built around an inside patio that would have a wooden, terrace type floor, so the house will be long and wide, but not high.
    You might want to consider going higher; if, like me, you don't do stairs well; use a ramp.
    In our area they generally go with piles on 2 story and a grid plus a ring on single story homes.

  23. #23
    MrG
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    Quote Originally Posted by DrAndy
    they build with all sorts of wood here Teak is the most expensive and desirable but other woods are also excellent
    Had not seriously considered this. More grist for the mill. Thanks.

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    Raft is good with local lightweight concrete construction.If the ground is not stable then a series of beams linking column footings is better.

  25. #25
    MrG
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    Quote Originally Posted by cambtek View Post
    Raft is good with local lightweight concrete construction.If the ground is not stable then a series of beams linking column footings is better.
    Isn't a raft a pad of cement over footings with a cement over the top?

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