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it all depends on the span,u can cut down on the size of your joist by putting a mid span beam most likely an lvl. The smallest you can use safely most of the time is a 2x8.most common is probably a 2x10,but if you are spanning more than eight feet without a beam then you should look into tgi joist, they are manufactured joist to carry a certain load and the lumber yard can tell you which ones you will need when you go for a take off list. your best bet is to talk to you town building inspector before buying anything The most common wood used for joists is SPF (spruce, pine, fir)

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