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Old 10-21-2009, 02:26 PM   #1
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concrete pad in earthquake zone

I'm planning on pouring a concrete pad that'll be about 10' x 16'. It's going to be situated under a deck, and it'll be used for storage and a carport. There is a slope of about 12" to 15" in the 10' direction while it's basically level in the other direction. The pad will be about a 18" away from the edge of the house, and won't abut anything. I've done a couple of smaller pads (3' x 3' and 3.5' x 8'), so I think I can manage the finishing and all of that. But I do have a few questions, and I've found a lot of conflicting advice online, so I was hoping somebody could help out. Here are my questions:

1) Ideally, how thick should this pad be? I don't mind spending more on concrete if it actually serves a purpose.
2) Is it necessary to have expansion joints?
3) Is there anything special that could be done to make it more stable when the ground shakes? I was thinking of digging a few footings/piers, say, 2 feet deep, since it seems to me that these would help it stay in place, and it's not much extra work.
4) Anything else?

Jeremy Hillary Boob, PhD is offline   Reply With Quote
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