What size joists and beam

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What size joists and beam

From: david.stickney@ge.com
Category: Decks
Remote Name: 12.39.66.134
Date: 19 Oct 2004
Time: 10:13 AM

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I am building a deck over an existing cement slab. I live in the Northeast. The dimensions of the deck off the back of the house are 30' long by 16' out from the house. My question is how far of a span can I go away from the house and with what size joists without having to bust up the cement slab to pour footings and instal a support beam in the middle. Currently I have dug footings to support a beam at 15'(just over the existing cement slab). I wanted to be able to span the 15' from the house without putting a beam in the middle. Can I do that with 2x12 joists? Thanks for your help. DAve

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