Concrete Proch

RYANINMICHIGAN

10x14 porch 4 inch slab. framed with 2x8 16 oc spanning 10 feet atached with z brackets. no suport under. Do you guys think this will hold until it cures?

joasis

You may want a center member breaking up the 10 foot span, simply due to the weight. If you are comfortable with the Z brackets, which I wouldn't be, why not? Worst case of 60# per sq/ft dead load for 8400# total. Or 780# per stringer....lots of weight. When we pour in ground storm cellars, we use 2X6's on 1 foot, and 2X12's 2 foot on under the 2X6's cross ways, for about the same dead load. Reality is the load will be lighter, but...concrete is wet and heavy, and the form weight is there also.

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RYANINMICHIGAN

Ya it should hold but the thought of failing while I am trowling and going into a hole 9feet deep, riding the crete and forms all the way down does not sound fun. I think I will cut it open on my own and add some support.

joasis

You should try it like we do it...6 inches of wet mud on top while we are in the hole, troweling the floor. Listening to the form box creak and groan isn't for the weak of heart. 60# per sq/ft of weight is more then you will have, but I like to go heavy since you will be up there, working the pour. At least if it failed, you would be on the top riding down, not under the load like we are at risk of.

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