re: removing 4x4 post from concrete slab

quote:

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I would cut them flush and use a 4"x4" post base or pedestal for the new posts

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My concern with that is that remaining post wood in the concrete will rot due to it being exposed to water at every rain and no place to drain. That anchor bolt will have nothing to hold onto. If you can relocate the post slightly and use a concrete anchor, you will have a better product.