Concrete pad size for a shed

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Old 01-21-17, 11:36 AM
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Concrete pad size for a shed

I'm getting ready to build 20'x16' shed with concrete foundation. The exterior veneer will be brick, so how much larger will the pad have to be?
 
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Old 01-21-17, 12:02 PM
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You would not want to put a shed that will have a brick veneer on just a pad that is prone to shifting from frost and settling. It should have a footing and stem walls, then a pad on top. Your brick ledge woukd be part of the stem walls, and to answer your question, would be 9" larger than your outside sheathing dimension. (Assuming your plates will be 19' 11" and 15' 11".) This accounts for 4 1/2" per side for airspace and brick.
 
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Old 01-21-17, 12:19 PM
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Note the O/P's location. I doubt there is that much frost shift. I'm south of him so that makes a difference but I doubt most houses are even poured that way down here and most houses are slab.
There are three common concrete slab foundation designs in the United States. They are known as:

Poured wall foundations
Pier or pillar foundations
Slab foundation

Most of the concrete foundations constructed for homes in Houston and other parts of Texas are the third type, slab foundations. Generally these foundations are poured concrete and vary between 3 and 6 inches in thickness. In addition, there are three variations of slab foundations known as: desert, wet/warm area, and cold area. The first two, desert and wet/warm, have been constructed by builders for many years in the Houston and Texas area.
Source: http://www.dawsonfoundationrepair.co...ab-foundation/
 
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Old 01-21-17, 12:45 PM
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I'm in Central Texas. So, 20x16 should be poured to 20'9"x16'9"? I was thinking the edges, about 12" width should be about 12" deep for support of the walls?

I've sent quote request to 2 contractors, but haven't got an answer yet.

I would also like it to have toilet and sink, but not sure if that's feasible. The location will be about 20' from the back of the house.
 
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Old 01-21-17, 12:47 PM
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Ok thats fine... location isn't visible on mobile devices.
 
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Old 02-23-17, 10:58 AM
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Got a quote $7500. That's about $21.60/sqft. Is this about right?
 
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Old 02-23-17, 12:37 PM
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No way for us to know. Is that for the whole shed? For just the pad? For the plumbing and the pad?
 
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Old 02-23-17, 01:11 PM
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The only way to realistically quantify a price for a particular project in a particular region is to get a second bid, and, if practical, depending on the population density around you, a third bid, from other local contractors. At that point, assuming they are in the same ballpark, it may not come down to the lowest price as much as who you have the most confidence in, or whatever.
 
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Old 02-24-17, 01:15 PM
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This is just for the pad. Finally, after calling 4 different contractor, another one responded. This person quoted $2200, and he's gonna pour 17x21', that extra foot for the footing. That's a huge difference of $5300 from the other guy.
 
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Old 02-24-17, 01:36 PM
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I was gonna say, if that was just for the pad, I could drive to Texas and do it for that much! LOL Those bids must not include any plumbing under the pad, huh?
 
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