Soil Conditions?

Cache

I've attached a scan of the geotechnical study on my lot. I have two questions for you guys who are more familiar with excavation.

1. What is your overall impression of the conditions?
2. To what extent, if any, do you think I will need foundation drainage?

My basement foundation will go down 5' below grade. Thanks for any comments.

Attached Thumbnails

 

genecarp

no found drainage, needed

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Blas

Is it going to be a full basement or crawlspace? You will probably need to remove the silt portion from under footings but if you are going to be through the silt with your foundation then it will not be a problem. If it is a basement you will definitely need foundation drainage especially with that layer of silt water doesn't move through the silt like it does sand. Also during construction the silt will likely become unstable if you decide to leave it on site flip flop it for sand in a landscaped area. That is just my two cents.

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"It is what it is"

Cache

Full basement. My footings are going to be around 6.5' deep which should put them in the gravel layer. Also I will be backfilling with the gravel/silt/sand mixture. Do you really think I'll have a drainage problem?

dayexco

you realize just how cheap drain tile is? sump pumps are cheap, pump pits are cheap...i'd put it in myself. i live on a lake, very sandy material, my basement floor sits 6' over normal high lake elevation. in the flood of 97, the water table came up through the cracks in the floor, being it was so high off the lake, sandy soil....the builder didn't put any drain tile around it...i bought all new sheetrock/carpet. ended up with 4" of water in my basement. the city had us plug our floor drains because all the sewer mains were being inundated due to the flooding, so we couldn't let it go down the floor drain

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someday, i'll be as patient as Nick.

Cache

Don't know how far above the water table I am, but I'm on a hillside about 500' off the valley floor. Went down 11' with no sign of moisture.

But you're right. Drain tile isn't expensive. Probably worth the cost. It's just the little things like that are gonna nickel and dime me to death.

genecarp

o brother

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rino1494

Pay now or pay later.

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Life is hard. It is harder when you are stupid

Uncle Sam wants YOU....to speak ENGLISH

tgeb

It won't be too cheap to dig up the foundation and add drainage in 2 years.

Put it in now, here it's code for basements.

Where are you located?

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Tom

www.gebcon.com

Cache

Northern Utah

denick

Ca,

There is no code requirement in Utah for drainage or damp / waterproofing?

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Nick

"Every day I remind myself that my inner and outer life are based on the labors of other men, living and dead, and that I must exert myself in order to give in the same measure as I have received and am still receiving" Albert Einstein

cdub

Around here we almost never encounter a water table. Soil is usually a heavy clay or shale. Ground water is not a problem, but EVERYBODY waterproofs (tile, rock, pump) even walkout basements (w/o pump) its a nothing cost that saves big problems.

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"The beatings will continue until morale improves."

Blackhammer

Here in florida it hard to dig 3 feet without hitting water. No basements here.

cleveman

If you put in tile and all is well after 20 years or so, you can dig it up and sell it on e-bay. Especially the t's and crosses are going to be worth a lot in the future.