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Discussion Starter · #1 ·
Backyard patio, approximately going to pour 5 inches thick. The cement piers from the previous wood deck are still in the ground. Do they need to be removed, or can I pour cement over them? The concrete will cover them by 3 inches. They are locked in pretty solid, as the soil is very silty clay. I'll tamp it to make a solid sub-base. Rebar will be added.

Thanks for your advice.
Eric
 

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Clay is famous in tx area for ruining many foundations. Dry/wet cycles. Could do the same in your area. Also check mike haduck's youtube videos about separating slabs from other parts of a structure. Your slab will move and the anchored parts on those piers will crack. I'd sledge hammer about a foot and bury the rest. That way, the slab is in one piece and moves on its own.
 

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A soil enginere wouldn't be guessing what the soil make up is but would rather test and you can too. And your cost will be the least expensive part of your project as that cost will approach $0.00.


I wouldn't allow he piers to remain unless they could be covered at least a couple of inches with compacted fill.
 

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Discussion Starter · #8 ·
Thanks everyone for the advice and the references. I'll remove the piers, makes sense. I wasn't planning to use an aggregate base, as we have pretty mild temp changes in So Cal (no freezing), and I will be tieing in plenty of rebar.
 
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