Unusual deck/porch question

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Old 05-29-14, 12:12 PM
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Unusual deck/porch question

I am adding a porch to our house. The area in which I will construct the porch has an existing concrete pad that measures the same depth as I'd like the new porch, but not the same width (I'd like the porch to be wider). This pad is obviously at ground level, and the new porch will be at door height. For the area of the porch that will be on the concrete pad, I'm hoping to avoid tearing up part of the pad in order to dig footers for the porch supports. The design I'm left with seems to be a porch that is partly attached to the house (the part that is not above the existing pad), and partly free-standing (the part that is above the existing pad). I'm sure this has been done somewhere, somehow, by someone, but is it advisable? I need 80#/sq foot for a covered deck, how can I ensure the "free-standing" portion of the deck has that? Is it better to remove enough of the pad to have the new porch completely attached?
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Old 05-29-14, 11:12 PM
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Too many variables and not enough specifics to provide some reasonable opinions. In general, if frost isn't an issue in your area, the porch can be supported by both the house and detached concrete footings. Don't skimp on the beam, joist and flooring sizes if you want the porch to be firm and stout.
 
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