Excavation For Foundation

 
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Old 12-22-2016, 04:36 PM   #1
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Excavation For Foundation


On the plan it shows top of foundation wall elevation. It is 8 foot walls. Would i just minus from that elevation 8 ft for the walls and 10 in for footings? My question is do the concrete guys pour a true 8 ft wall? I see that they do not pour to the top of there forums. Are there forums taller that 8ft?
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Old 12-22-2016, 06:02 PM   #2
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Re: Excavation For Foundation


We usually get a top of slab elevation and set the sub-grade to -8" to allow for slab and stone.

If I were you, I'd ask the foundation guy what he is expecting and move on from there.

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Old 12-22-2016, 09:04 PM   #3
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Re: Excavation For Foundation


I hate when they don't do the math on the drawings. It's so much easier to do when you're drawing the lines and thinking about it. Wreaks of CYA bullchit...

Form size depends on the contractor. Do they have their own forms? Are they renting? If the wall is supposed to be 8 feet, they better be building 8 feet. Subtracting the dimensions as you mention is how I would go about figuring out the excavation grade. I would ask the GC all these questions.
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Old 12-22-2016, 09:59 PM   #4
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Re: Excavation For Foundation


elevations have to be relative to a set benchmark.

8' tall in relation to what?????
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Old 12-23-2016, 01:38 AM   #5
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Re: Excavation For Foundation


Quote:
Originally Posted by griz View Post
elevations have to be relative to a set benchmark.

8' tall in relation to what?????
the hole
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Old 12-23-2016, 06:05 AM   #6
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Re: Excavation For Foundation


Make sure you account for the basement windows so you don't end up with window wells.
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Old 12-23-2016, 07:49 AM   #7
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Re: Excavation For Foundation


What do you do if you have 4 foot tall egress windows. ?

Be just as easy to pour foundation on existing grade and backfill around it

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Old 12-23-2016, 06:47 PM   #8
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Re: Excavation For Foundation


If you are building a Home with 9' basement walls and possibly a thicker truss floor system, a few minutes designing the garage slab height relative to the Home's FFL will be rewarded. A majority of garages in a local upper-end sub-division have garage bays that aren't long enough for a full sized vehicle due to the steps and landing framed into the garage...

A few truck loads of compacted fill will add thousands of dollars of resale value.
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Old 12-24-2016, 01:46 AM   #9
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Re: Excavation For Foundation


Ask the GC, I'd rather figure it out for you than have you screw up the job.
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Old 12-25-2016, 09:23 PM   #10
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Re: Excavation For Foundation


Quote:
Originally Posted by jmcex View Post
On the plan it shows top of foundation wall elevation. It is 8 foot walls. Would i just minus from that elevation 8 ft for the walls and 10 in for footings? My question is do the concrete guys pour a true 8 ft wall? I see that they do not pour to the top of there forums. Are there forums taller that 8ft?
Yes, that is correct. For example, if your top of wall is at 100.00 relative to the bench mark, you would subtract the height of the poured wall from 100.00. If it was an 8.0' wall the base would be at 92.00. Now subtract 10" or .83 feet for the footing and you end up at 91.17. This is the elevation you'll dig to. You want to make sure what the concrete guy is pouring for a wall and footing height. Often, what they call an 8 foot wall is actually 7'-10".

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