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RE: Ungrouted Base Plates?

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> For structures that support significant gravity loads, the 
> grout may be a necessity. However, if the base plate is designed for
> resistance and the gravity load is small in comparison, then it doesn't
> matter to the plate if the bolts are in tension or compression.
> Advantage? No grout. It has no purpose in this application 
> and can be a maintenance issue and corrosion concentrator.

Another advantage of "no grout" is an increased moment arm. With grout, 
the compression reaction is closer to the tension bolts. Without grout 
the moment arm is the full spacing between the bolts.