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Old 07-18-2017, 07:26 PM  
soparklion11
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Default Concrete pad with existing columns on 1x1ft pillars

My brother had an area 4x13 ft that is currently gravel and under an overhang of the roof of my house. That roof is supported by 3 4x4 wooden posts that sit on 1x1ft concrete footers that stretch over 2 ft deep.

We plan to pour concrete to a level 2 inches higher than the height of the concrete footers. If we pour concrete over the entire 4x13 ft and cover the existing footers, I fear that the concrete pad will heave and crack since the post footers won't heave... Am I correct that I need an expansion joint there?


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Old 07-18-2017, 09:55 PM  
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Put something between the pier and the new concrete so they don't stick together.


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Old 07-19-2017, 07:46 AM  
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What is your location? What is the frost line, if any, in your area? What kind of soil is under the gravel section under your roof? Does water drain into this area or is it kept pretty dry?
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Old 07-20-2017, 07:58 AM  
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Put something between the pier and the new concrete so they don't stick together.
Yes, I was thinking asphalt - fiber expansion joint material.
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Old 07-20-2017, 08:03 AM  
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Default Pittsburgh PA

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What is your location? What is the frost line, if any, in your area? What kind of soil is under the gravel section under your roof? Does water drain into this area or is it kept pretty dry?
Pittsburgh PA - "Soil Freeze Depths for Pier and Strip Foundations Without Skirting" is listed as 48"...

The soil is mostly clay and abuts the front of the house so there is some back-fill present. There is also ~3" of sand under the 4" gravel bed.

The lady of the house has some plants in front of the porch and that are watered sometimes.
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Old 07-20-2017, 09:13 AM  
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Old 07-20-2017, 12:43 PM  
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Put something between the pier and the new concrete so they don't stick together.

Do you mean around the pier or on top of it?
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Old 07-20-2017, 01:24 PM  
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Around and don't add concrete on top as the frost can heave it up but it may want to settle too. So allowing the sidewalk to move is the safe thing to do.
But I have seen people get away with just pouring concrete over and around it and even drill rebar into it. But all that is taking chances.
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Old 08-15-2017, 07:40 PM  
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Thanks Neal. I'll let you know how far it heaves this winter... LOL


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