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I'm building a short (3.5 ft) fence in my front yard. I have most of the posts sunk in dirt holes, but two of them will need to be mounted on a concrete slab.

The problem is that the slab has a slight slope to it and the post brackets I have will cause the posts to not be completely vertical.

These are the brackets I bought: http://www.homedepot.com/p/Simpson-Strong-Tie-12-Gauge-Black-Powder-Coated-E-Z-Base-FPBB44/100655350

Is there something I can put under this bracket/anchor to make it sit level?

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    Why not cut a slight bevel in the bottom of the post to bring it back to level? – bib Dec 9 '15 at 21:16
  • The anchor is a tight fit and the bottom of the anchor is metal so either way I can think of doing that wouldn't work, unfortunately. – Chris May Dec 11 '15 at 5:29
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One or two galvanized or stainless-steel washers between the post base and the concrete should do. The latter are thinner and would allow finer angle adjustment. If you don't like the look of the gap underneath, fill it with a fine bead of gray caulk.

That said, there's probably plenty of slop against the post that you can plumb it and add the side screws to keep it plumb even if the base is slightly out of level.

To really make it solid with either approach, use heavy-duty construction adhesive between the base and the post.

  • I actually thought of using washers but thought it might be too "hacky". Nice to hear someone else suggest it. – Chris May Dec 9 '15 at 19:26
  • Can you clarify what you mean by slop against the post? – Chris May Dec 9 '15 at 19:27
  • It's unlikely that the post will perfectly (snugly) fit in the base, and that you wouldn't be able to tilt it a small amount equivalent to the slope in the slab. – isherwood Dec 9 '15 at 19:35
  • I see. I actually tried putting the post on the anchor already and it's a very tight fit-- I actually had to pound it in. – Chris May Dec 9 '15 at 19:38
  • Then your path is clear. :) – isherwood Dec 9 '15 at 19:40

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