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I'm building a backyard storage shed that will be supported by two 4x6x16' pressure treated rails laying on concrete piers. The 6" side will be flat against the pier.

concrete pier

At the building supply store I have seen metal 6x6 post bases that seem to be used for attaching a post to concrete:

post base

Since I'm using pressure treated lumber, and the piers stick above the ground a bit, do I really need these? Can the rails sit directly on the concrete? I can bolt the rails directly to the piers with wedge anchors.

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You can sit the rails (or beams) right on the piers and level them using shims. That bracket is used for vertical mounting columns.

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