Nothing will be perfect. Wood in the ground won't last forever. However, if
the posts extend beyond (deeper than) the concrete into some gravel, the
bottoms will drain and they won't rot so fast. About the worst thing you can
do is put wood into concrete, without letting it stick through the concrete.
But copper naphanate is still available as a wood treatment & is
available by the gallon at hardware stores. Pour it in a small
diameter bucket and stand the 4x4 in it overnight to allow it to wick
up. It'll turn your redwood green for a few weeks, then the sun will
bleach it back natural.
Make a block of 2x4 of old growth heartwood redwood or heavily treated
wood (soaked in an appropriate wood preservative)
as the piece beneath the end of the 4x4 and against the concrete.
Think of if as a chunk of mud sill.
Transverse grain is much more resistant to moisture than end grain.
End grain against concrete is bad design practice
If your new posts are not heartwood they're not going to be very
You could also soak (over night) the ends of the 4x4's in paint cans
with a few inches an appropriate wood preservative.
What is your application? raised deck? post & pier foundation
I believe the OP is using a pre-made pier that includes the straps.
The Simpson product you suggest could be "cut down" (strap portion
and the remainder used a giant galvanized spacer. :)
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