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Old 04-20-2014, 01:19 AM
Serf
 
Join Date: Apr 2014
Location: Luxembourg
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Default Subsidence on anew build

Hello,

First time poster, I've been reading a good bit for the last while as I consider my build of the great resource that is the forum.

I have a question I would like to ask the collective brain. I recently moved house and in the past week I have removed 50ish evergreen/leylandia trees from my yard/garden. The trees were 25-30 foot tall and had not been pruned/trimmed in 10 years. Roots were pretty extensive and they were planted very closely together 20 years ago.

Removing the trees and roots was a big job and we took a digger. To get under and undermine and remove the roots in places we dug down 3-4 foot.

In summary the ground and area where I want to build my 36 oven (and hopefully parrilla style grill would not be "settled". I do not want to lay foundation and start a build if it will subside under the weight or move. How long should I wait?

Thanks,

Mullins
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Old 04-25-2014, 06:18 AM
Peasant
 
Join Date: Apr 2014
Location: Slovenia
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Default Re: Subsidence on anew build

I belive soil will take more than five years to compact naturally. You should use vibrating plate or vibrating hammer and compact soil layer by layer (about 6" at a time).

Gorazd
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Old 04-25-2014, 06:54 AM
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Default Re: Subsidence on anew build

You need to excavate to undisturbed soil then compact in lifts, certain native materials do not mechanically compact well so might need bring some engineered material.
Gulf likes this.
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Old 04-26-2014, 06:15 AM
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Default Re: Subsidence on anew build

Thanks for the responses. I should have mentioned (completely forgot) that the digger was 3,5 tons and that would have rolled over the area a couple of times. Not systematically to compact it, but in levelling the yard it would have been rolled over a few times and compacted somewhat. Probably not as loose as I initially thought, but I guess I will have an indication as I begin to excavate...

Thanks for your help.
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Old 04-27-2014, 08:58 AM
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Default Re: Subsidence on anew build

Quote:
Originally Posted by UtahBeehiver View Post
You need to excavate to undisturbed soil then compact in lifts, certain native materials do not mechanically compact well so might need bring some engineered material.
Excuse the ignorance, but what do you mean "in lifts"?

Thanks

(

Last edited by Mullins; 04-27-2014 at 08:59 AM. Reason: edited for spelling
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Old 04-27-2014, 09:24 AM
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Default Re: Subsidence on anew build

Maybe an American term, lifts are layers of material to be compacted.
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Old 04-27-2014, 10:11 AM
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Default Re: Subsidence on anew build

Quote:
Originally Posted by UtahBeehiver View Post
Maybe an American term, lifts are layers of material to be compacted.
Gotcha.

A previous response of mine appears to have gone missing where I have clarified that the 3.5 ton caterpillar would have compacted the soil somewhat as the yard was levelled (the tracks may not have covered all the ground as the tracks did not pass over all of the ground systematically....)
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Old 04-27-2014, 11:59 AM
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Default Re: Subsidence on anew build

Mullins,

The Cat does a decent job what we call in my trade (pipeline construction) wheel rolled or track rolled but on if done in lifts, if the Cat tracked over the 3-4 foot hole from the tree roots with no lifts the bottom part of the excavation most likely not compacted (if this is where you want to put the oven). That's why compaction is done in lifts.
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Old 04-27-2014, 02:21 PM
Serf
 
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Default Re: Subsidence on anew build

Quote:
Originally Posted by UtahBeehiver View Post
Mullins,

The Cat does a decent job what we call in my trade (pipeline construction) wheel rolled or track rolled but on if done in lifts, if the Cat tracked over the 3-4 foot hole from the tree roots with no lifts the bottom part of the excavation most likely not compacted (if this is where you want to put the oven). That's why compaction is done in lifts.
I was afraid someone was going to say that! Thanks for your advice...
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Old 04-27-2014, 05:38 PM
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Default Re: Subsidence on anew build

Quote:
Originally Posted by Mullins View Post
I was afraid someone was going to say that! Thanks for your advice...
I'll have to be another one to second that. I would mark off the site for the oven and begin digging. Mind you that the top crust under the dozier tracks will seem solid. I have had to use a pickaxe to get down 8", only to find nothing but loose fill underneath. If you get down a foot in one corner to good solid subsoil, quit digging in that corner. Go to the opposite corner. Dig until you find the solid subsoil, even if that is 4 feet deep. Do the same in the other two corners. Now taper all four quadrants of your dig to together to form a solid but most likely an uneven bottom. Now fill the entire dig with crushed gravel or a similar fill up to the level that you want to start your concrete slabs for the oven and parrilla .
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