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Old 08-12-2015, 02:38 PM   #1
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Deck footings


Hi everyone!

I am currently in the process of building a 9x10 deck and currently have the ledger boards up (two sides of the deck connect to the house) and I've just dug the holes. At first, I wasn't aware that since the footer holes are within 5 ft of the house foundation I had to dig as deep as the basement walls (was about 5ft deep, still was not fun). Anyways, those are dug and the inspector is coming out tomorrow to make sure they're good.

I am in a bit of a pickle here in deciding how to get the concrete in the holes. From my calculations, I will need about 50 bags of 80lb quikrete mix (almost $800 delivered) or I can possibly go with a truck that will pour it for me. Does anyone know the cost difference between these two options?

Also, just to make sure my calculations are right, the two holes are ~18in in diameter and 5 ft deep. That equals to about ~8 cubic ft, and an 80lb bag of quikrete filles 0.6 cubic feet so that is approximately 15 bags.

Last edited by MrVrba; 08-12-2015 at 03:03 PM.
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Old 08-12-2015, 03:12 PM   #2
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It's about $300 delivered. I was originally calculating volume using diameter instead of radius. Phew.
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Old 08-12-2015, 03:21 PM   #3
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Quote:
Originally Posted by MrVrba View Post
I will about 160 bags of 80lb quikrete mix (almost $800 delivered) or I can possibly go with a truck that will pour it for me. Does anyone know the cost difference between these two options?
The cost difference might be your sanity. 160 bags?

Do you really need four yards? How many piers are you pouring?



(Edit: I see you edited your original post to 50 bags.)

Last edited by keymaster; 08-12-2015 at 03:27 PM.
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Old 08-12-2015, 03:44 PM   #4
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Quote:
Originally Posted by MrVrba View Post

Also, just to make sure my calculations are right, the two holes are ~18in in diameter and 5 ft deep. That equals to about ~8 cubic ft, and an 80lb bag of quikrete filles 0.6 cubic feet so that is approximately 15 bags.

I get 8.8 cubic feet per footing, using 18" dia. and 60 inch length. Using your measurement of 80# bag of concrete, .6 cubic feet, then you need 14.66 bags of concrete. (That's a lot better than 160.)
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Old 08-12-2015, 04:19 PM   #5
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Yeah, you're right. Thanks. I think I'll just go get those bags and rent a mixer and go from there. Thanks!
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