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Grout under base plate

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If you are concerned about getting full bearing under these baseplates,
forms should be built 2 inches beyond the baseplates, and a non-shrink grout
be poured in a "plastic" consistency (like a thick milkshake).  If your
baseplates are very large in plan, you may have to provide port holes in the
plates so that air can be released and you can see that the area is being
filled below.  I would recommend that you contact a reputable grout
manufacturer for specific recommendations (Masterbuilders, Sika...).  For
very tight spaces you may have to consider using a grout pump.

Placing grout in a "dry pack" consistency will result in voids under your
baseplates, especially with spaces less than 1 1/2 inches.

karen casano, PE
san diego

From: "Reza Dashti Asl" <rezadashti(--nospam--at)>
To: seaint(--nospam--at)
Subject: Grout under base plate

The gap under some base plates in one of our jobs will be from 0 to 2" due 
to concrete (mis)placement. Columns are designed as pinned and some of them 
have bracings (for seismic zone 3 and wind). Base plates are welded to 
columns. What kind of grout do you specify for gaps less than 1/2"?(For gaps

between 1/2" and 2" I am going to use a cementitious non-shrinking grout, 
like Five Star) Any other concerns? I'll appreciate all comments.

Reza Dashti

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