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Thread: Land Fill

  1. #1
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    Land Fill

    Hi All,When we go back to Thailand at the end of March 2009 i want to have the landfill done with a veiw to start Builing in 2011.How Deep should it be?,obviously I will have to allow for settlement.is it best to cover the whole area of land,rather than just the area to be built on?.the total area of land we have is just over 1 Rai.My Mother in law wants to have a lake dug on her land,and has said that we can have the soil from there,and also we have acess to rock,what should the makeup of the landfill be?

  2. #2
    Cacoethes scribendi
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    1. How much soil ?

    Good question. A lot depends on what sort of land it is. Farm land, rice fields, old wood, rubbish tip etc. As a rule of thumb, Higher than the surrounding land and any nearby road. We raised our by about a metre and a half, for just the house, and sloped it gently down. Many folk settle for about a metre or so but you could get away with less.

    2. Rocks or not ?

    The last thing you want to find, when you are digging holes for the pillars, is a bladdy great rock. they can be a real pain to get out. Small rocks would be good for other things like shoving under the path, drive or concrete slab. Personally, I would go for a soil heap and have it spread out by a guy with a tractor. That will start the settling process.

    If you are going to raise the whole site, you need to think about containing it with a wall. Otherwise it will slowly dissapear back into the surrounding countryside.

    Best of luck.

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    Thanks for the reply LoomBucket,the land we have is ex Rice paddy.Me and the Mrs got some crossed wire's as she had kept on about the need to put stone in the landfill,it transpires that what she was on about is a binding layer on top of the soil,I suppose this is something similar to type 2 scalpings that we would use here in the UK,and come to think about it,I have seen it in Thailand its a sort of Dark Red colour.we will have to grade the soil so that it slopes towards the road that runs right in front of our plot

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    Guest Member S Landreth's Avatar
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    Your Mrs. is right. Rock (fill) is the best type of material to use when filling a piece of property for a home (apposed to the red silt material here in Thailand). But it can be expensive, that is one reason why people/contractors will use local material (the red soil/silt you see around Thailand) when filling property.

    I agree with LoomBucket,…..large rock will become a problem when digging to pour foundations. You should use rock that is 3 inch or less, at least under the building foundations/drive way/pool area (where you might be digging).
    Have the fill placed in “lifts” about 1 foot high and properly compacted before you place the next “lift”, until you reach grade. This should solve your problem with settlement (unless you do use the red soil/silt and the water table moves up and down in your property,…your property might settle some).

    Please remove the organic soil before you start filling the property (since it used to be a paddy field). If you do not remove the organic soil and fill on top of the organics, your property will settle in time (because the organic soil will decompose) and cause cracks in your home/pool/driveway.

    You asked a question on how much fill should be added to your property to bring it up to grade before you start building. You should contact a local qualified engineering (civil) company to help you answer this question. They should have historical flood maps that will show high water elevations in different areas around your family’s property. An easy way to determine where you should fill to (elevation of the pad of your home) is by asking neighbors who have lived in the area for years (at least 50 years) and ask them, “Where is the highest point the water has ever reached in the neighborhood (during floods)?”,……..then add 1 meter (3 feet) of fill to that point. But your pad elevation should not ever be lower than any paved highway [highway,.not a graded road near by,..I think LoomBucket was referring to this when he said “….any near by road.” (LoomBucket might have be referring to a more permanent structure, like a highway) Some local roads might have been built out of convenience for the neighborhood and cost was a factor in building the road so the locals will just do as little as possible to get them to their property and build roads just high enough to keep them from getting wet most of the year] in the area.

    If your mother-in-law wants a lake dug and her property is close by,………good for you. The cost of the material to fill your property might not cost as much (cost to dig and transport to your property). However, if the lake the mother-in-law wants dug is in an area where there is just that red Thai soil/silt you might want to rethink digging a lake for her. The main reason is because after time the slopes of the lakes will level/flatten out (like water seeking its own level). The lake might fill itself back in after a few years because of rain (also large animals tracking material down the slopes) and leave your mother-in-law a low depression on her property where the lake used to be. The red soil here in Thailand is Not a good soil to stabilize the slopes of a lake with (or to be made out of). The red soil is like a mud and when wet and will slowly move back into the deeper parts of the lake.

    You should build a retaining wall around the property as LoomBucket suggested if you are going to fill the property.

    There is an alternative! Build like some Thais build (and how homes used to be built in the Florida Keys,..another low lying area susceptible to high water and where the cost of fill is quite expensive). Build the home (at least the main living quarters) on pilings.
    Use the ground level of the home as a parking area and for the utility/laundry room,.maybe even the maid’s quarters. Use the platform to build your home on. These types of homes are built along the eastern coastal areas of the states.
    You would still have to fill the property to a safe elevation,.so it dies not flood every year.

    What I described above are some basics. You will learn/question more once you start to spend money.

    One more thing,…………A “Land Fill” is not the proper term to use. “Land Fills” are usually associated with land that is filled with garbage/trash (a dump). You are going to be filling or elevating your property.

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