Excavation cost of a rocky plot.

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Roberts2019
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Joined: Fri Feb 22, 2019 9:33 am

Excavation cost of a rocky plot.

Postby Roberts2019 » Fri Sep 27, 2019 7:05 am

Hello,

We are looking to buy a plot of land in Xania area. We found the plot that we like but, its very Rocky, a lot of Big Boulders, The Land is Flat not on a Mountain. I was wondering if anyone had this experience while building your home? what is the Extra cost of Excavation on a very rocky land versus a flat clean plot?
Thank you
Nina

bobscott
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Location: Kokkino Horio

Re: Excavation cost of a rocky plot.

Postby bobscott » Fri Sep 27, 2019 7:46 am

Cost could be anything, depending on size of plot, access for heavy plant etc. Why not get a few quotes from builders, to include site clearance and then make a decision? Bob.
Yesterday today was tomorrow. Don't dilly dally!

Kilkis
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Joined: Sat Apr 21, 2007 3:58 pm
Location: Near Chania

Re: Excavation cost of a rocky plot.

Postby Kilkis » Fri Sep 27, 2019 10:09 am

They use large diggers to excavate the whole area where the house will stand to a depth of about 1 m so it probably doesn't make much difference what they are excavating. There will almost certainly be large rocks below the surface whether there are ones on the surface or not.

The main problem is if they hit bedrock, although that can also be an advantage. For example I know of plots where plans were submitted for a two storey house plus an underground basement. When they started to excavate they rapidly hit bedrock and applied for building permission for the basement to only be half height below ground, i.e. it became a two and a half storey house. That meant that it was possible to put windows in the basement and make it habitable.

Warwick

Roberts2019
Posts: 34
Joined: Fri Feb 22, 2019 9:33 am

Re: Excavation cost of a rocky plot.

Postby Roberts2019 » Fri Sep 27, 2019 11:21 am

Kilkis wrote:They use large diggers to excavate the whole area where the house will stand to a depth of about 1 m so it probably doesn't make much difference what they are excavating. There will almost certainly be large rocks below the surface whether there are ones on the surface or not.

The main problem is if they hit bedrock, although that can also be an advantage. For example I know of plots where plans were submitted for a two storey house plus an underground basement. When they started to excavate they rapidly hit bedrock and applied for building permission for the basement to only be half height below ground, i.e. it became a two and a half storey house. That meant that it was possible to put windows in the basement and make it habitable.

Warwick



Thank you Warwick.. also, do they do soil test here before building the house?

Roberts2019
Posts: 34
Joined: Fri Feb 22, 2019 9:33 am

Re: Excavation cost of a rocky plot.

Postby Roberts2019 » Fri Sep 27, 2019 11:32 am

bobscott wrote:Cost could be anything, depending on size of plot, access for heavy plant etc. Why not get a few quotes from builders, to include site clearance and then make a decision? Bob.



Hi Bob,
yes, we will be getting few Quotes, I just thought I get some what an Idea. :-) Thank you

Kilkis
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Location: Near Chania

Re: Excavation cost of a rocky plot.

Postby Kilkis » Fri Sep 27, 2019 11:36 am

I'm not sure what you mean by soil tests?

Warwick

Roberts2019
Posts: 34
Joined: Fri Feb 22, 2019 9:33 am

Re: Excavation cost of a rocky plot.

Postby Roberts2019 » Fri Sep 27, 2019 11:46 am

[quote="Kilkis"]I'm not sure what you mean by soil tests?

Warwick[/quote

Take a sample of the soil to determine the amount of chemicals in the soil, and The level of gravel or rock present in the soil.
it's a standard procedure in US, not sure here.

Jeffstclair
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Re: Excavation cost of a rocky plot.

Postby Jeffstclair » Fri Sep 27, 2019 11:57 am

Kilkis wrote:I'm not sure what you mean by soil tests?

Warwick


I think it depends on where you are ... It's not like in the UK where house are built on land that has had many uses , land fill , old quarry workings , reclaimed land , drained marshland ,and so on where they bore a hole and take out a core and examine the layers ...I think here they'"might" get a JBC and dig a deep but small hole and the guys with Ipads come and have a look down it and then charge you.... and then tell you to add more steel and more concrete ... :D

Roberts2019
Posts: 34
Joined: Fri Feb 22, 2019 9:33 am

Re: Excavation cost of a rocky plot.

Postby Roberts2019 » Fri Sep 27, 2019 12:03 pm

Jeffstclair wrote:
Kilkis wrote:I'm not sure what you mean by soil tests?

Warwick


I think it depends on where you are ... It's not like in the UK where house are built on land that has had many uses , land fill , old quarry workings , reclaimed land , drained marshland ,and so on where they bore a hole and take out a core and examine the layers ...I think here they'"might" get a JBC and dig a deep but small hole and the guys with Ipads come and have a look down it and then charge you.... and then tell you to add more steel and more concrete ... :D



Thank you Warwick :-) What's you opinion about a Very Rocky Land, are there any tests we should be aware of to determine excavation cost. the plot we found is in Sternes Akrotiri ...

Kilkis
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Location: Near Chania

Re: Excavation cost of a rocky plot.

Postby Kilkis » Fri Sep 27, 2019 12:42 pm

That was Jeffstclair's reply not mine. I have no opinion on soil types. I am not a geologist or a civil engineer.

Civil engineers have a general idea of what the ground structure is in different areas but I am not aware of them doing tests on specific plots. For example, I am pretty sure that the civil engineer knew that the plot I quoted above had bedrock not far before the surface. It wasn't a shock to them if you understand what I am saying. They know where the water table is in each area because virtually all the water comes from underground aquifers and they know how deep they need to bore the wells. I can't really see what else they need to know? The steel used in the construction is based on earthquake resistance and I don't think it varies from plot to plot. The house is built on an approximately 1 m deep reinforced concrete box, or matrix of boxes, full of soil and rubble. On top of that is a reinforced concrete skeleton of pillars, cross beams and ceiling with the reinforcing tied into that in the foundation box. The skeleton is filled in with two layers of 4", partly hollow, engineering bricks with a 2" gap between. The gap is filled with expanded polystyrene sheet. The whole thing is then rendered inside and out with three layers of render. The first layer is rough and uneven, i.e. it is simply thrown on. The next layer is also rough but it is even, i.e. it is plastered on. The final layer is smooth and even. I would recommend embedding plastic mesh in the first two layers overlapping the joins between the skeleton and the brick work to help stop cracking due to differential thermal expansion.

Warwick

Roberts2019
Posts: 34
Joined: Fri Feb 22, 2019 9:33 am

Re: Excavation cost of a rocky plot.

Postby Roberts2019 » Fri Sep 27, 2019 1:02 pm

Kilkis wrote:That was Jeffstclair's reply not mine. I have no opinion on soil types. I am not a geologist or a civil engineer.

Civil engineers have a general idea of what the ground structure is in different areas but I am not aware of them doing tests on specific plots. For example, I am pretty sure that the civil engineer knew that the plot I quoted above had bedrock not far before the surface. It wasn't a shock to them if you understand what I am saying. They know where the water table is in each area because virtually all the water comes from underground aquifers and they know how deep they need to bore the wells. I can't really see what else they need to know? The steel used in the construction is based on earthquake resistance and I don't think it varies from plot to plot. The house is built on an approximately 1 m deep reinforced concrete box, or matrix of boxes, full of soil and rubble. On top of that is a reinforced concrete skeleton of pillars, cross beams and ceiling with the reinforcing tied into that in the foundation box. The skeleton is filled in with two layers of 4", partly hollow, engineering bricks with a 2" gap between. The gap is filled with expanded polystyrene sheet. The whole thing is then rendered inside and out with three layers of render. The first layer is rough and uneven, i.e. it is simply thrown on. The next layer is also rough but it is even, i.e. it is plastered on. The final layer is smooth and even. I would recommend embedding plastic mesh in the first two layers overlapping the joins between the skeleton and the brick work to help stop cracking due to differential thermal expansion.

Warwick


Thank you .. I was a little confused who answered to what :D


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