Footing Size

 
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Old 10-01-2010, 05:04 PM   #1
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Footing Size


Hey guys, quick question.
I need to build a handicaped ramp for one of my customers. The door is about 22" above grade and I need to build a small deck from the door to the ramp. I need to go down 48" for my footings. My question:
Will 8" dia footings be sufficient?
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Old 10-01-2010, 05:09 PM   #2
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Re: Footing Size


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Originally Posted by mpmaint View Post
Hey guys, quick question.
I need to build a handicaped ramp for one of my customers. The door is about 22" above grade and I need to build a small deck from the door to the ramp. I need to go down 48" for my footings. My question:
Will 8" dia footings be sufficient?
Yep, good to go. If you are pulling a permit check with the city spec.

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Old 10-01-2010, 05:24 PM   #3
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Re: Footing Size


Better check on the dimensions for the deck & your door clearance.
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Old 10-01-2010, 05:26 PM   #4
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Re: Footing Size


Mp, how about posting an intro in the introduction section and tell us about you and what you do.

Hint: adding your location to your profile will help a lot in getting good info for footing requirements in your area.
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Old 10-01-2010, 05:55 PM   #5
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Re: Footing Size


Well to me a small deck is 100 sq ft, and 8" footings might not be enough depending upon soil bearing capacity
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Old 10-01-2010, 05:58 PM   #6
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Re: Footing Size


If you have any idea of the quality, it will be easy to find out the area required. If the deck is an unpreferred ledger attachment, you should go below the frost levels for any footing. If they are not deep enough, a frost heave would slope the deck back toward the house.
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Last edited by concretemasonry; 10-02-2010 at 05:04 PM.
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Old 10-01-2010, 06:42 PM   #7
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Re: Footing Size


I stopped guessing a long time ago. I generally use 12' for every poured footing I do. It's not that much more labor to dig and another couple 80lb bags of concrete are not a big deal.
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Old 10-01-2010, 06:44 PM   #8
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Re: Footing Size


I'm not even allowed to use an 8" sono tube, let alone an 8" footing.
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Old 10-01-2010, 08:39 PM   #9
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Re: Footing Size


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Originally Posted by shanekw1 View Post
I'm not even allowed to use an 8" sono tube, let alone an 8" footing.
IT is a 48"depth footing, with a 8"diameter. This is not rocket science, ok I agree a 8" diameter maybee small so go 10". I think he is not building a bridge that needs a spread footer. Or I think he does not need to drill a pilion footer because the ground is sand or built over a swamp. He is probably using 4x4 treated lumber for his posts. And to top it off if he is asking this question he is a diy, not a carpenter or a contractor.
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Old 10-02-2010, 08:54 AM   #10
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Re: Footing Size


I'm in the same jurisdiction as Shane, so the 8" tube is not available.
Also, we would need a footing pad at the bottom of the sono tube.
Make one from 2 x 8's or scroll to the bottom of this page to see a prebuilt version: http://www.anchsand.com/default.aspx?tabid=186
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Old 10-02-2010, 10:44 AM   #11
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Re: Footing Size


Quote:
Originally Posted by CONCRETE MIKE View Post
IT is a 48"depth footing, with a 8"diameter. This is not rocket science, ok I agree a 8" diameter maybee small so go 10". I think he is not building a bridge that needs a spread footer. Or I think he does not need to drill a pilion footer because the ground is sand or built over a swamp. He is probably using 4x4 treated lumber for his posts. And to top it off if he is asking this question he is a diy, not a carpenter or a contractor.
Probably is a DIY'er & this ain't a diy'er site, best to send them there.

On a side note, any inspector here who saw an 8" footing would be laughing, all the way back to his truck to pick up a red tag.
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Old 10-02-2010, 10:58 AM   #12
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Re: Footing Size


Quote:
Originally Posted by CONCRETE MIKE View Post
IT is a 48"depth footing, with a 8"diameter. This is not rocket science, ok I agree a 8" diameter maybee small so go 10". I think he is not building a bridge that needs a spread footer. Or I think he does not need to drill a pilion footer because the ground is sand or built over a swamp. He is probably using 4x4 treated lumber for his posts. And to top it off if he is asking this question he is a diy, not a carpenter or a contractor.
No one said it was rocket science.

An 8" sonotube would get chucked by my inspector. 10" min.

An 8" footing would get what deckman said. 28" bigfoot min.

Although, as a side, a deck under 24" off the ground needs no permit or footings (not sure about wheelchair ramps and landings.) I could build that on pier blocks.

My first reply sort of implied that I thought he was a DIY anyway.
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Old 10-02-2010, 01:00 PM   #13
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Re: Footing Size


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Originally Posted by shanekw1 View Post
No one said it was rocket science.

An 8" sonotube would get chucked by my inspector. 10" min.

An 8" footing would get what deckman said. 28" bigfoot min.

Although, as a side, a deck under 24" off the ground needs no permit or footings (not sure about wheelchair ramps and landings.) I could build that on pier blocks.

My first reply sort of implied that I thought he was a DIY anyway.
28" diameter min? I think that is over kill, but i don't know the spec. in your area of the world. Here in cleveland ohio the spec. for a attached or detatch deck with 4x4 posts is 36"-48" depth footer 8" or 10" sono tube, and also here you don't need any sono tube. Attached structures also call for 36"-48" depth footer with a min 10" wide footer if using 8" block, 14" wide if using 12" block.
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Old 10-02-2010, 04:54 PM   #14
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Re: Footing Size


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Originally Posted by CONCRETE MIKE View Post
28" diameter min? I think that is over kill, but i don't know the spec. in your area of the world. Here in cleveland ohio the spec. for a attached or detatch deck with 4x4 posts is 36"-48" depth footer 8" or 10" sono tube, and also here you don't need any sono tube. Attached structures also call for 36"-48" depth footer with a min 10" wide footer if using 8" block, 14" wide if using 12" block.
I only said that because the 24" big foot won't accommodate a sono larger than 8".

I use big feet and sono tubes exclusively because they save time and headache.

4x4 posts don't fly here, either.
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Old 10-02-2010, 05:26 PM   #15
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Re: Footing Size


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Originally Posted by shanekw1 View Post
I only said that because the 24" big foot won't accommodate a sono larger than 8".

I use big feet and sono tubes exclusively because they save time and headache.

4x4 posts don't fly here, either.
What about a landing on a staircase? you have 4 24" footings holding up a 4'x4' landing ???
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Old 10-03-2010, 11:35 AM   #16
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Re: Footing Size


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What about a landing on a staircase? you have 4 24" footings holding up a 4'x4' landing ???
I would just use a post hole digger, dig 48" in depth, and case the 4x4 post or 6x6 with concrete, plumb my post, and build the dam little deck. Collect my money and move to the next.

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Old 10-03-2010, 07:24 PM   #17
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Re: Footing Size


Guys, Thanks for the replies. Sorry for the lack of info but the landing is 5'x5' and 22" above grade, and a ramp leading down to the driveway.
We have to go down 48" on footings and I used 10" sono tubes. I know, complete overkill for such a simple structure.

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