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Old 18th December 2007, 11:20 PM   #40 (permalink)
Ekka
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Join Date: Jan 2007
Location: Brisbane
Posts: 8,022
Default Re: Soil subsidence and trees

It really depends on a few factors from an engineering point of view.

1/ Soil type, you need to know what you got.

2/ Engineered foundation, what have you got.

3/ Structure of the house. Our house is brick veneer, common here. The strength of the house is in the timber frame and the masonary or brick is a facade to a degree. It bears no loads.

4/ Type of tree.

Most people here when they buy a house get a building inspection, your house would be picked up for the tree and the wall. Even if the wall were repaired so it was unnoticeable the builders report would likely nail the tree anyway. But that's here, not where you are.

You need to get a pic of that crack ... close and distance, if need be trace the crack in MS paint etc so we can see it.

Builders can come out and check the levels with laser, they'll know where it's upheaval or subsidence.

Then it's suggested a soil test to know what you exactly have. Then it's also suggested the soil test is also done opposite side of house to a non affected area as a "control" hole. Check and compare for moisture and plasticity/strength.

Could be as easy as watering.

The root barrier should be about 3' away from the house too, but not done with backhoe or trencher. Need a clean cut, some use water cutters but there are machines similar to a concrete cutter where a rotating blade cuts a clean slot.
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